.300 Varminter and QuickLoad Observations

Discussion in 'Rifles, Bullets, Barrels & Ballistics' started by gunderwood, Jul 7, 2009.

  1. gunderwood

    gunderwood Active Member

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    This is a very long post, but I think it will be worth your time.

    I was interested in the .300 Varminter and noticed there is substantial controversy on this forum concerning it. After reading quite a few posts, I broke out QuickLoad and decided to see if it was even close for a .300 WSM to drive the 125gr Nosler BT to 4000fps. At first glance it seems it is not, at least with reasonable pressures.

    However, QuickLoad is just a model. Professionally I am an engineer and I have done quite a bit of modeling/simulations and analysis across many different fields; I still have much to learn. One of the things that is often forgotten is that most of the equations we have from physics and we engineers use are simplifications, models. They only work under a given set of assumptions. Should be common sense, but if I had a nickel for every time someone refused to believe what they were seeing because the model said it couldn’t happen…

    It is also important to build the right kind of model. Too often engineers get caught up in our models and want to model/simulate everything, even when there are other more accurate/reliable solutions. A wise, old engineer/physicists told me a story once about how a particular government program wanted to build a simulation. It was going to take a significant amount of money and time to build the simulation and test it. Then even more money and time to actually run the simulation and get statistically valid results. This older engineer pointed out that a simulation was pointless because there was an analytic solution and you usually use the analytics to validate the simulation. So he got some paper and solved it analytically in a day.

    The moral of the story is only build a model/simulation when you need too and only trust it when it agrees with the analytics and the real world. Now that that bit of modeling philosophy is out of the way, let’s take a look at the .300 Varminter claims.

    It seems some of the .300 Varminters critics like to cite the Hodgdon reloading data. Unfortunately, the Hodgdon data does not specify barrel lengths nor twist rates. To evaluate this data I used QuickLoad, the Hodgdon reloading data for the 125gr Nosler BT in .300WSM, and the Modern Reloading Second Edition by Richard Lee.

    The data for the .300WSM and a 125gr jacked bullet (page 459) is identical to the Hodgdon data. Unfortunately, no barrel or twist rate is given. Using QuickLoad, I played with the barrel length until I was able to minimize the error in pressure and velocity on all of the Nosler 125gr BT loads from Hodgdon (both Min/Max loads):

    QuickLoad Data
    Bullet 125gr Nosler BT
    Starting Pressure (PSI) 3626

    Barrel Length (in) 24.5

    COL 2.81


    Starting
    Powder Grs FPS Delta PSI Delta
    H4350 69 3343 11 51354 -4,446
    H414 68 3303 -15 51392 92
    760 68 3257 -61 47857 -3,443
    IMR 4007 65.8 3247 4 52047 2,347
    H380 68 3426 80 59274 4,174
    Varget 61 3203 -109 48827 -5,873
    H4895 58 3078 -236 42420 -14,180

    Max
    Powder Grs FPS Delta PSI Delta
    H4350 73 3548 67 62426 -574
    H414 72 3500 -40 61918 -1,382
    760 72 3457 -83 57877 -5,423
    IMR 4007 70 3454 -33 63457 657
    H380 71 3572 79 68403 5,803
    Varget 65 3390 -88 58648 -4,452
    H4895 61 3215 -216 48808 -14,192

    Everything is default QL except the COL and barrel length. I tested other cartridges with the Nosler 125gr BT and the starting pressure seems correct for this bullet and QL (data presented further on). It appears that the Hodgdon data is from a 24.5” barrel (+- 0.5”). Interestingly, Varget and H4895 both have substantial differences in pressure/velocity between QL and Hodgdon/Lee.

    Returning to the QL defaults (COL 2.860” vice 2.810”) and a barrel length of 24.5” I get 3371fps, 53314psi for 70gr of N550. This is Richard Franklin’s suggested starting load. However, his .300 Varminters are built on 30” barrels yielding: 3579fps, 53314psi, for 70gr of N550 in QL. A far cry from 4000fps, but still not close to max pressure either.

    Richard’s 4000fps load is supposed to be 75gr of N550. QL results are: 3610fps, 67226psi for a 24.5” barrel and 3773fps, 67226psi for a 30” barrel. Still 250fps shy of 4k and already approx. 3000psi over CIP MAP. If we stopped here it would be easy to say someone is a liar or the loads are easily over 70k psi. I decided to push onward and check some base assumptions and things get interesting.

    I decided to pull up Lapua/Vihtavuori reload data. At least in theory, their data should be spot on for their powders. Fortunately, Lapua specifies barrel length and twist rate. It should be noted that the twist rate for the .300 WSM test barrel (1:10) is tighter than optimal for the 125gr Nosler BT and much tighter than the 1:15 Richard uses. I compared the Lapua data for N550 (Richards recommended powder) against QL:

    Test Barrel: 24.5” 1:10 twist
    COL: 2.709”
    Otherwise QL defaults

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 62.7 3117
    Lapua 123gr FMJ - QL 62.7 3016 -101 37565

    Lapua 123gr FMJ 67.7 3468
    Lapua 123gr FMJ - QL 67.7 3258 -210 47283


    Interestingly, QL is giving 101fps lower for the starting load and 210fps lower for the max loading. Just for fun I wanted to see what the max load was under QL was: 74.4gr of N550 for 3580fps in a 24.5” barrel. About the same as what I got for the Nosler.

    Bullet Grs FPS Delta PSI
    Lapua 167gr Scenar 54.9 2730
    Lapua 167gr Scenar - QL 54.9 2600 -130 36007

    Lapua 167gr Scenar 61.3 3025
    Lapua 167gr Scenar - QL 61.3 2882 -143 48907

    Again, QL gives data that is much slower then Lapua’s N550. Max loading in QL was: 67.1gr for 3130fps in a 24.5” barrel.

    Bullet Grs FPS Delta PSI
    Lapua 185gr Mega 52.6 2572
    Lapua 185gr Mega - QL 52.6 2454 -118 35031

    Lapua 185gr Mega 59.1 2844
    Lapua 185gr Mega - QL 59.1 2727 -117 47836

    QL is still 100fps lower in the .300 WSM than the Lapua factory data. It does seem the heavier bullets give less error in velocity than the lighter bullets. It is also possible Lapua’s data is junk (not likely). It should be noted that Lapua wasn’t specifying pressures, so I have no idea if the QL number above are even close. Nearly every Lapua factory load I tested during this inquiry QL calculated the pressure right at MAP – 25%.

    To test the quality of QL predictions with Vihtavuori powder and the .300 WSM I tried comparing some more loadings.

    Cartridge 300 WSM
    Test Barrel 24.5" 1:10
    COL 2.709"
    Powder N150

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 59 3159
    Lapua 123gr FMJ - QL 59 2943 -216 37252

    Lapua 123gr FMJ 63.3 3386
    Lapua 123gr FMJ - QL 63.3 3142 -244 45618


    Cartridge 300 WSM
    Test Barrel 24.5" 1:10
    COL 2.709"
    Powder N160

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 66.1 3127
    Lapua 123gr FMJ - QL 66.1 2871 -256 35891

    Lapua 123gr FMJ 72.5 3428
    Lapua 123gr FMJ - QL 72.5 3174 -254 47990

    This is only two other factory Lapua loadings, but both are showing similar results to N550, 200+fps low in QL. It doesn’t seem to be a problem with the 5 series of powder, but most comparisons are needed.
     
  2. gunderwood

    gunderwood Active Member

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    Here is the more:

    I was growing tired of the .300 WSM data not matching, so I tried an old workhorse, the .308Win. Lapua data vs. QL:

    Cartridge 308 Win
    Test Barrel 24" 1:12
    COL 2.756"
    Powder N130

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 37 2684
    Nosler 125gr BT - QL 37 2666 -18 37042

    Nosler 125gr BT 43 3068
    Nosler 125gr BT - QL 43 3020 -48 56027

    Cartridge 308 Win
    Test Barrel 24" 1:12
    COL 2.756"

    Powder N133

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 40.1 2721
    Nosler 125gr BT - QL 40.1 2761 40 40733
    Nosler 125gr BT 46.3 3120
    Nosler 125gr BT - QL 46.3 3121 1 62462

    Cartridge 308 Win
    Test Barrel 24" 1:12
    COL 2.756"
    Powder N135

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 41.6 2732
    Nosler 125gr BT - QL 41.6 2717 -15 35298

    Nosler 125gr BT 48.9 3143
    Nosler 125gr BT - QL 48.9 3163 20 59860

    Cartridge 308 Win
    Test Barrel 24" 1:12
    COL 2.756"
    Powder N140

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 44.1 2739
    Nosler 125gr BT - QL 44.1 2703 -36 37168
    Nosler 125gr BT 49.8 3071
    Nosler 125gr BT - QL 49.8 3055 -16 54943

    Fantastic data! The .308Win results are extremely close and this is the factory data for the Nosler 125gr BT. The starting pressure was set to the QL default of 3626psi. As I stated before, the QL default starting pressure for the Nosler seems to be correct. The interesting thing is that these are Vihtavuori powders again, but the data is spot on. Granted these are faster burning powders, so more analysis is required.

    How does the .300WM compare?

    Cartridge 300 WM
    Test Barrel 24.5" 1:10
    COL 3.224"
    Powder N150

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 61.6 3094
    Lapua 123gr FMJ - QL 61.6 2890 -204 34695
    Lapua 123gr FMJ 69.9 3383
    Lapua 123gr FMJ - QL 69.9 3241 -142 49216

    Cartridge 300 WM
    Test Barrel 24.5" 1:10
    COL 3.224"
    Powder N550

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 65.7 3110
    Lapua 123gr FMJ - QL 65.7 2971 -139 35459
    Lapua 123gr FMJ 72.8 3448
    Lapua 123gr FMJ - QL 72.8 3286 -162 47501

    Cartridge 300 WM
    Test Barrel 24.5" 1:10
    COL 3.224"
    Powder N160

    Bullet Grs FPS Delta PSI
    Lapua 123gr FMJ 69 3081
    Lapua 123gr FMJ - QL 69 2816 -265 32960
    Lapua 123gr FMJ 77.9 3409
    Lapua 123gr FMJ - QL 77.9 3199 -210 47341

    The QL data for the .300WM seems to match slightly better than the .300WSM data does for N550, but there is still about 150 fps differences. The other Vihtavuori powders also seem to be off by substantial amounts too. So far anything with Mag in the name seems to be way far off with light bullets.

    How about one of my favorites .338LM?

    Cartridge 338 LM
    Test Barrel 27.5: 1:10
    COL 3.681"
    Powder N560

    Bullet Grs FPS Delta PSI
    Lapua 250gr Scenar 74.5 2630
    Lapua 250gr Scenar - QL 74.5 2534 -96 37980
    Lapua 250gr Scenar 82.2 2841
    Lapua 250gr Scenar - QL 82.2 2791 -50 50857

    Not too bad, but still off by a lot more than the .308Win was. However, note that this is a heavy bullet, 250gr, and the .300WSM was showing an error of only 120fps with 185gr bullets.

    How about 30-06?
    Cartridge 30-06
    Test Barrel 24.5" 1:10
    COL 3.307"
    Powder N550

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 57.1 2936
    Nosler 125gr BT - QL 57.1 2955 19 40045
    Nosler 125gr BT 60.3 3117
    Nosler 125gr BT - QL 60.3 3130 13 47807

    Dead on; even with the light Nosler bullet. How about another Mag?

    Cartridge 300 WbyMag
    Test Barrel 26" 1:10
    COL 3.543"
    Powder N160

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 80.2 3430
    Nosler 125gr BT - QL 80.2 3215 -215 44962
    Nosler 125gr BT 85.2 3623
    Nosler 125gr BT - QL 85.2 3422 -201 54389

    Huge errors again! Either Lapua magnum data is junk or QL is having an issue with magnum velocities and Vihtavuori powders. To see if this problem is a QL and magnum issue or if Vihtavuori powders are part of the issue I pulled up some other factory load data.

    How does Nosler’s own data for their 125gr BT sound? I used the QL defaults for COL, etc., but played with the barrel length as Nosler didn’t specify it. To match the velocities IMR4064 needed a 32” barrel and RL-15/Varget needed 29” barrels. It is unlikely that Nosler tested these lengths, but we don’t really know. I put the barrel length back to 24.5” because I thought that was reasonable and probably closer to what they tested. Only max loads shown:


    Cartridge 300 WSM
    Test Barrel 24.5"
    COL 2.86"
    Powder IMR4064

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 64.5 3602
    Nosler 125gr BT - QL 64.5 3393 -209 58835

    Cartridge 300 WSM
    Test Barrel 24.5"
    COL 2.86"
    Powder RL-15

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 66 3580
    Nosler 125gr BT - QL 66 3441 -139 58747

    Cartridge 300 WSM
    Test Barrel 24.5"
    COL 2.86"
    Powder Varget

    Bullet Grs FPS Delta PSI
    Nosler 125gr BT 66 3542
    Nosler 125gr BT - QL 66 3416 -126 59872

    Again the .300WSM data in QL is much slower than the factory data. I don’t think QL pressures are that far off as all of these Nosler factory loads are right at MAP – 10%. Let’s take RL-15 (because it is in the middle of velocity loss and I like this powder) and put a 30” barrel on the gun (like Richard’s 300 Varminters). Also, according to QL 68gr of RL-15 is the max before breaking the MAP.

    Cartridge 300 WSM
    Test Barrel 30"
    COL 2.86"
    Powder RL-15

    Bullet Grs FPS PSI
    Nosler 125gr BT - QL 66 3600 58747
    Nosler 125gr BT - QL 68 3691 64357

    Add the 150fps or so that the RL-15 seems to be off in QL and you get approx. 3750fps and 3850fps. All without breaking MAP. Now for N550.

    Cartridge 300 WSM
    Test Barrel 30"
    COL 2.86"
    Powder N550

    Bullet Grs FPS PSI +200fps +250fps
    Nosler 125gr BT - QL 70 3538 53304 3738 3788
    Nosler 125gr BT - QL 74.1 3731 64455 3931 3981
    Nosler 125gr BT - QL 75 3773 67212 3973 4023
    Nosler 125gr BT - QL 75.4 3791 68477 3991 4041

    70gr of N550 is the starting charge; it reaches mid 3700s when corrected. 74.1gr is right under the CIP MAP; it is good for mid 3900s corrected. 75gr is Richard’s hot loading; it is good for 4000ish. 75.4gr is the MAP that Norma brass is suppose to handle safely (I heard this from people. I have no insider knowledge and it could be completely wrong); it is good for just over 4000fps. However, if the Norma brass MAP is correct than it would explain why Richard’s 300 Varminters were not seeing pressure signs with 75gr N550 and BAT actions.
     
    Last edited: Jul 7, 2009

  3. gunderwood

    gunderwood Active Member

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    Given this data I think QL is under calculating the velocity for magnum cartridges with light bullets. I think it is clear that to get 4000fps hot loads must be used, but Richard said he was seeing around 3800fps with 70-72gr of N550. The corrected velocities seem to be real close to 3800 with 70gr. Without going over MAP and with corrected velocities it seems 3900+fps is achievable with some assumptions.

    First, even if the QL velocity correct is accurate, the correction for velocity would have to be constant, it won’t be. Richard is throating these guns for these bullets, he is also using high quality SS barrels which factory data probably isn’t. A slightly longer COL? Any of these things can change the pressure/velocity significantly. Etc. Etc.

    E.g.
    Cartridge 300 WSM
    Test Barrel 30"
    COL 2.91"
    Powder N550

    Bullet Grs FPS PSI +200fps +250fps
    Nosler 125gr BT - QL 70 3518 52003 3718 3768
    Nosler 125gr BT - QL 74.1 3709 62722 3909 3959
    Nosler 125gr BT - QL 75 3750 65366 3950 4000
    Nosler 125gr BT - QL 75.4 3769 66578 3969 4019
    Nosler 125gr BT - QL 76 3796 68441 3996 4046
     
    Last edited: Jul 7, 2009
  4. gunderwood

    gunderwood Active Member

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    Summary

    If you don't want to read and analyze all of that, here is the short story.

    Richard Franklin's .300 Varminter should be able push the 125gr Nosler BT to 3800fps easy and probably 3900fps without breaking CIP MAP according to my QL analysis. This is because QL seems to be under calculating the velocity of all magnum cartridges with light weight bullets when compared to factory data. 3900fps takes the pressure right to max. To reach 4000+fps the QL analysis suggests that CIP MAP must be exceeded, but it will still be within wildcat cartridges MAP range of 68k psi.
     
  5. gunderwood

    gunderwood Active Member

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    How about Sierra 5th Ed. data for the 125gr SPT?

    QL numbers vs Sierra's, COL 2.76":
    H4895 -239fps 49,042PSI
    IMR4350 +98fps 67,232PSI
    RL-19 +64fps 62,192PSI
    IMR4831 +169fps 70,318PSI

    So 4895 shows similar results as the Lapua data, slower by 200+fps, but everything else is faster. 4831 is much faster (169fps vs. Sierra), but the pressure of RL-19 and 4831 are well over CIP MAP of 64, 542PSI. Think QL is a little off on the PSI? Or is Sierra publishing 70k+ PSI loads as "safe?"

    QL is a great tool, but it seems to fail on these .300WSM loads. Always check your models against measured data or analytics to verify they are producing good results.
     
  6. sambo3006

    sambo3006 Well-Known Member

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    Interesting stuff. Anybody know if Richard has ever put a strain gauge on one of his rifles and shot it over a chronograph? That would shed more light and would seem to be more concrete evidence one way or another (anecdotal as it would be though, if done with just one rifle).
     
  7. Tyler Kemp

    Tyler Kemp SPONSOR

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    I remember some of his hot loads were said to only be safe in custom action. FYI
     
  8. gunderwood

    gunderwood Active Member

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    Yes, his hunting buddy runs a Varminter on a Rem700 action. The 700 action only runs 3800fps loads, while the Bat actions can run the 4000fps loads. A MAP load of N550 in 300WSM with the 125gr Nosler runs 3600fps in QL. However, the data suggests QL is under by 200-250fps compared to real measured data. Thus, a MAP loading should be running 3800-3850fps. The hot loads run 68k and I wouldn't run them on a Rem700 action. They have tested them, but the brass doesn't last but a couple of firings when shot on a 700 action. On Bat actions they are getting many reloads and no pressure signs.
     
  9. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

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    Have to comment on this. Not looking to start a fight but I was involved in the last heated debate on the 300 Varminter and I got so tired of third hand "opinion" that I contacted Richard directly with some questions to get the actual facts.

    His actual comments, if you want decent case life, you have to drop velocity to 3800 fps no matter what receiver you are using.

    When loaded to the +4000 fps level, primer pockets would loosen dramatically on first firing and be to loose to use after 2 firings but he was perfectly fine with that as he only wanted the performance and cared little about replacing brass after two firings.

    He was even willing to send me some brass from his rifle, one that was a once fired case and one that had been fired twice. He was dead on with his comments. Once fired primer pockets were noticably loose, case with two firings held a primer but I would not have shot that case and neither would be.

    Simply put, I could care less what a computer predicts, loading a 125 gr BT out of the 300 WSM at +4000 fps will produce chamber pressures that will noticably loosen a primer pocket on the first firing and make the case unusible after only two firings....... This is right from the mans own lips and I give him credit for being honest with what he is seeing.

    It did not matter at all what receiver the brass was fired in, 3800 fps was the limit if you wanted more then two firings, did not matter if it was a Rem 700 or a BAT, go over 3800 fps and you loose your primer pockets, go to 4000 fps, even in the BAT, two firings and thats it.

    Again, not making this up. I was sick of listening to a third party opinion so I contacted him directly to get the facts, and he gave them to me and I reported them back then.

    I have no idea how many PSI he is pushing in his +4000 fps loads but its enough to make a case worthless after only two firings.......
     
  10. gunderwood

    gunderwood Active Member

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    Absolutely. This is exactly what Richard told me. Perhaps I misunderstood, but I thought that he was getting more firings at high pressure with Bat vs. the Remington.


    As I pointed out in my post, models are good tools, but are far from perfect. I was interested in what the computer said, which is why I ran so many QL models (many more than I posted). The computer was showing a little over 68k PSI to reach 4k fps, which should wreck brass pretty quick. 3800fps give or take is right at MAP and you should get more firings. I noted that some people, who claim to own 300 Varminters, also claim to not have signs of pressure at 4k fps. I don't have one yet, so I don't know if this is true or not. Loose primer pockets != no signs of pressure.

    In all of my discussions with Richard, he never said you could get more than a couple (technically means 2) firings at 4k fps before brass was toast. I think the only thing we disagreed on was the number of firings with the different actions. Again, perhaps I misunderstood Richard, but I thought that regardless of whether he was firing 3800fps MAP loads or 4000fps hot loads, that Bat actions were getting more firings than the Remington.

    Does it really matter if a R700 action only gets one firing at 4k fps, while Bat gets two...vice versa? Nope. Either way those loads are hot and the brass won't last more than a couple of firings. Would I prefer a Bat if I was to run 4k fps loads, sure. Were I a smith, would I recommend a Bat action over a R700 if my customer wanted to run 4k fps load, you bet. Do I have any evidence that this would be the technically correct thing to do? Nope. Personal preference based on my understanding of the actions, absolutely.

    The real reason for posting was to show how QL can be off by enough to cause real arguements about the ability to push round X at Y fps.

    P.S. Kirby, I respect your work quite a bit and have been thinking about ordering a .338 Allen Mag in the couple of years.
     
    Last edited: Jul 9, 2009
  11. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

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    I really have no dog in this fight. Richard builds fine rifles, that is without question, He is a man of honesty and is direct and hides nothing and is willing to put it out there and let others choose for themselves.

    That said, I have had several customers contact me since the 300 "varminter" started its buzz and I flat refuse to recommend my customers load the 300 WSM up to anywhere near 4000 fps for one simple reason.

    You have to listen to your brass and your gun. One may not warn of pressure signs(rifle) but the other always will(brass). If a primer pocket is loosening to the point of being unusible after two firings, in my professional opinion, you are running on the ragged edge of safety.

    If a case with a weak or flawed case head of weak primer cup for that matter slips into the ammo box, or something as freak as a spider laying an egg nest inside a case, Boom, if you think that is dramatic, believe me, it can happen and has to me and it was not a fun experience. Luckily, it was a small capacity chambering and no serious damage was done to rifle or me except for a face full of hot gas and a few minor cuts and bruises. Had it been a case of this capacity it would have likely caused some serious damage to the rifle and myself.

    Again, if you think these freak things can not happen...... My brass was new, packed in a folded closed box which was inside another closed box.... After this experience I went through each case and out of 250, there were 8 of then that had spider egg sacs inside the cases. For those that think a spider egg sac will burn up instantly and not increase pressure, simply put, that is not correct.

    Anyway, my point is, why push things so hard. 3800 fps is top end 220 swift velocity and with a 125 gr bullet, really what will a 4000 fps load do that a 3800 fps load can not do but do safely? I would rather error on the side of a larger safety margin personally.

    This is really my only point.
     
  12. BountyHunter

    BountyHunter Writers Guild

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    Gunderwood

    Boy, did you hit the nail on the head!

    QL data is collected and based off "factory rifles, with factory loads in factory chamberings and barrels". After that you have to tweak the QL program parameters to match your MV and load data to make it work. It is not "The Almighty Gospel" as some would believe.

    My QL version of the of the original data was about 4000 fps under the original QL data posted. I called the QL engineer and spent about two hours with him to find out if I made a mistake and to figure out why that could be. (No consideration for barrel twist for a 17 twist vs a 10 twist, throat adjustments, friction coefficiant adjustments, program tweaks set as normal parameters etc, etc are just some of the possible reasons). The "flame Franklin debate" was in full swing by that time and was a total waste of time to try and explain to people that the QL data posted was worse than useless. Lets leave it as misleading.

    QL is a great tool to get in the ball park and to pick a moderate starting point, but unless you have all the parameters and you actually tweak it to your rifle's specs, it is can be very misleading.

    That shows why we routinely see loads posted here that are completely safe in one gun and off the pressure chart in another. That is also why it is not safe to routinely start at the top ends off any posted loads.

    Glad to see someone clear up the pressure issue which was the original issue, not case life, as "hot wildcats" with short case life are routine on this site. Most just plan for it and throw away at 3-4 firings and nothing wrong that if that is what you want to do.


    BH
     
    Last edited: Jul 13, 2009
  13. Fiftydriver

    Fiftydriver <strong>Official LRH Sponsor</strong>

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    I may have missed something but I was under the impression that the debate about the hot loaded 300 WSM renamed the 300 Varminter was always based on excessive pressure and nothing else?

    Based on the personal cases that Mr. Franklin sent me to check out, and from his own words, he is running VERY high pressure. Many have touted that the Norma 300 WSM case can take excessive pressure with flying colors. If that is in fact the case and the primer pockets are still blown out by the second firing, I hate to think what the actual chamber pressure is in these loads.

    As far as hot loaded, high pressure, short case life wildcats being the norm on this site, I do not find any basis for that comment. I can say that in all the members I have talked with as well as non members, there have been a total of three guys that were fine with their cases letting loose after only 2 firings. Those would be Mr. Casull with his 338-416 Rigby Imp., Mr. Ferguson with his hot loaded 257 STW and Mr. Franklin with his hot loaded 300 WSM.

    Other then that, I have never talked to anyone that is happy with their cases being blown after two firings. From most I talk with if they are not getting 4 firings per case, they are not overly happy, espeically with brass prices more then doubling.

    While many say that brass cost is meaningless, well, thats simply not true with most of us.

    Again, Richard offered an unbiased opinion of what he is doing, even sent me brass to check it out myself and it was exactly as he discribed, brass is pretty much useless after two firings. Now, using a BAT receiver, with a chamber set at zero headspace, tight match chamber specs, proper throat design, very slow twist barrel, light bullet and still primer pockets are consistantly blown after two firings, how can that not be read as excessive pressure for the case design?

    Just asking the question.

    You can manipulate computers all you want to spit out numbers that look better for a certain cause, in the real world, if the pressures were comfortable for the case the round was be fired out of, the primer pockets would last for at least 4 firings per case and likely well more then that if in fact the new Norma 300 WSM is as strong as some believe it is.
     
  14. ATH

    ATH Well-Known Member

    Messages:
    855
    Joined:
    Oct 7, 2003
    I've driven the 110gr V-Max to 3800fps in a standard 300WM, I'd have to look up the powder but it was just shy of a full case. No pressure signs but no reason to beat up my brass or my gun for a few more fps. Except for the occasional coyote and the need in some areas for a bullet that disintegrates upon hitting about anything it's kind of a ridiculous concept anyways, I wouldn't shoot it if my 243AI was built.