nralifer
Well-Known Member
Both Peterson and Lapua make it. It's used in some competitions to stuff as much Varget in to the case without causing primer pocket expansion. Handles higher than average pressures.
Long Action vs Short Action.
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nralifer
Well-Known Member
Works well. I use CCI 450 primers. SRP brass can withstand higher pressures without primer pocket expansion.
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@WillELee here you go:
For Sale - Manners EH1 Defiance XM length stocks at Mountic Outdoors
Manners EH1 Defiance XM Length Stocks. There are inlet for the Hawkins XM DBM and work for the Defiance XM Length actions. Flush cups left. Sling studs bottom. Just a few left at the sale price. https://mounticoutdoors.com/products/manners-elite-carbon-eh1-defiance-xm-length-stock
jasent
Well-Known Member
For those maybe not quite understanding, all 3 of these are loaded to .020" off the lands. All very close in weight (7gr spread)
Only one will mag feed
Only one will mag feed
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nralifer
Well-Known Member
Nice illustration of how ogive length influences mag feeding. Longer ogives improve BC. That is why the short magnums benefit from use in longer actions.
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nralifer
Well-Known Member
I think the confusion stems from the imprecise definition of what is meant by a long medium and short action. This post more clearly defines these terms. Thanks for posting this.
jasent
Well-Known Member
I went with the middle choice. Had to seat it .110" off to mag feed, cost me 50fps with the powder I have on hand but it's still supersonic at a mile and shoots 1/4 Moa. The other 2 can't do that. My elr and hunting bullet in one load
I don't doubt it a bit. Just never really needed to try it. I was given a bucket full of LC Match and LC which has been some tough stuff. It mainly gets used in the AR 10. Winchester LRP brass has filled my bolt gun requirements
nralifer
Well-Known Member
What you have done is noticed the following. By extending the distance the bullet has to travel before it engages the lands you have increased the volume of combustion before the bullet hits the lands, at which point the pressure really starts to build rapidly. As this pressure forces the bullet further into the rifling, pressure is building along with resistance of the bullet to forward travel. At this stage 3 things are happening. 1) The volume of combustion is increasing as the bullet is engaging the rifling. 2) The power is continuing to burn creating ever increasing volumes of hot gas. 3) Resultant pressure is increasing because the rate of powder ignition continues to accelerate beyond the rate of volume increase as the bullet moves down the rifled barrel. It is in this time frame that you reach peak pressure. As the powder becomes fully ignited i.e. all the kernels are on fire or completely expended, the rate of hot gas formation starts to decline while the chamber volume is increasing because the bullet continues down the barrel. Finally all the powder kernels have ignited completely and there is no more burning powder to add to the gas volume, so the pressure continues to drop while still accelerating the bullet until it exits out the muzzle causing a sudden drop in pressure to atmospheric pressure and the bang we all love. You could gain back the speed you lost by increasing the powder charge a few grains or fractions thereof, and not worry about overpressure since the greater jump has increased the volume of initial powder combustion without increasing the total volume of gas produced, reducing the peak pressure. Without increasing powder charge, the result is that the average pressure that accelerates the bullet down the barrel is reduced a bit resulting in a little slower acceleration. You can make that up by increasing the total volume of gas produced by increasing the powder charge. I call this the Weatherby principle. Roy Weatherby capitalized on this trick by making chambers with longer free bore throats which allowed larger powder charges to be burned thus raising muzzle velocity, leading to the famed Weatherby magnums.
jasent
Well-Known Member
I was able to gain that speed back but it opened up to 1/2 Moa. So I just stuck with the original load. With g7 of .402 2960 is plenty for my needs. I'm already compressed as it is. I'm well into the life of this barrel now (720rds) so I'll stick with this load for the rest of this barrel.
Buck Fever
Well-Known Member
Well, if you like a project, look at a cheap Savage Axis. They are all the same action length with different bolt head baffles to limit bolt stroke for short action cartridges.
It's a tube style action so more rigid than open top.
With some simple machining you can face off the front of the action to use a standard 110 style recoil lug.
I used a .30-06 donor action with an Accu-trigger and used parts from Glades to build up my bolt with a fluted sleeve and extended knob. A spring mod and some shims made the trigger pretty nice for just a few bucks.
For a barrel I bought a 110 style prefit chambered in 284 Winchester.
I put that in a MDT LSS chassis and use their mags.
284 Winchester is technically a short action chambering but it never really fit right. Bench rest shooters win championships with 284 Winchester frequently with 175-190 grain high BC bullets which they single load. They don't use magazines but 284 Winchester loaded long has no chance fitting in a short action magazine.
It will fit in my magazine though. It's a pretty low budget project (my gen1 LSS was clearance priced). I could have saved money skipping the Glades parts for the bolt but I like them.
A Tikka build is similar but not quite as cheap. A Remington 700 build isn't as DIY friendly.
It's a tube style action so more rigid than open top.
With some simple machining you can face off the front of the action to use a standard 110 style recoil lug.
I used a .30-06 donor action with an Accu-trigger and used parts from Glades to build up my bolt with a fluted sleeve and extended knob. A spring mod and some shims made the trigger pretty nice for just a few bucks.
For a barrel I bought a 110 style prefit chambered in 284 Winchester.
I put that in a MDT LSS chassis and use their mags.
284 Winchester is technically a short action chambering but it never really fit right. Bench rest shooters win championships with 284 Winchester frequently with 175-190 grain high BC bullets which they single load. They don't use magazines but 284 Winchester loaded long has no chance fitting in a short action magazine.
It will fit in my magazine though. It's a pretty low budget project (my gen1 LSS was clearance priced). I could have saved money skipping the Glades parts for the bolt but I like them.
A Tikka build is similar but not quite as cheap. A Remington 700 build isn't as DIY friendly.
nralifer
Well-Known Member
Thanks for the information. I already have 2 110 actions and 3 mod 10 actions as well as a mod 12 action in a WSM. The test rifle I am using to test the 308Win came from a Stevens 270Win i used as the donor rifle. Interesting to hear that Savage is going to a fixed length action with variable bolt stops. Similar to Tikka and Sako like you said.
Buck Fever
Well-Known Member
The Axis is Savage's budget rifle but oddly I like a lot of the features. I believe their higher end offerings are still long and short action.
I would rather build up a custom action than a Savage (beside the Axis)...
I would rather build up a custom action than a Savage (beside the Axis)...
