270 win reloading help - 150gr partitions

[cb4128]

needing some help with next steps in reloading for my 270 win Remington Sendero.

I'm using the following components:

New nosler brass
Federal 210m primer
Nosler partition 150gr
H4831sc powder

Tried a range of powders from book minimum working up at 20 thou off and all groups were inconsistent.

Next range trip I tried 45 thou off and 3 groups were 1" or less, so much better.

I chrono'd the following velocities in the charge weights last time out (no pressure signs yet but I am at book max at 58.5gr)

57.0gr - (2,914 fps)
57.5gr - (2,945 fps)
58.0gr - (2,980 fps)
58.5gr - (2,977 fps) - best group, last picture

I have been spoiled with Berger's shooting really well on the first or second range trip in other calibers.

**I'm looking for input on what charge weights to revisit next time, based upon the groups pictured and the posted velocities.

My initial thought is to work around the 58.5gr charge weight up and down .1gr increments at the same COAL, or between 58-58.5 since there's a flat spot in velocity.

Thanks for any help!

 

[Dosh]

cb, perhaps try different seating depths or maybe primer change. My .270 Win shot stupid accurate with the 140 Berger and 4831SC, but didn't try any partitions. Good luck

 

[jeremy.b]

From my experience, you're probably sneaking up on the top-end of 4831SC with 150's at that velocity, depending on barrel length.

If it were me at this point id' probably play with seating depth at 58.5 for now in 1-2 tenth increments.

Another option would be to stick with your current seating depth and try slower powders RL26 (if you have some), 7828, etc. This would let you have a bit more headroom on the velocity department to either expand your current velocity node or find another one.

For reference (and assuming that you have a 26" barrel) here's a Quickload run with SAAMI specs if you consider trying other powders:

Cartridge          : .270 Win. (SAAMI)
Bullet             : .277, 150, Nosler PART SP 16323
Useable Case Capaci: 60.142 grain H2O = 3.905 cm³
Cartridge O.A.L. L6: 3.340 inch = 84.84 mm
Barrel Length      : 26.0 inch = 660.4 mm

Predicted Data for Indicated Charges of the Following Powders.
Matching Maximum Pressure: 64000 psi, or 441 MPa
or a maximum loading ratio or filling of 108 %
These calculations refer to your specified settings in QuickLOAD 'Cartridge Dimensions' window.
C A U T I O N : any load listed can result in a powder charge that falls below minimum suggested
loads or exceeds maximum suggested loads as presented in current handloading manuals. Understand
that all of the listed powders can be unsuitable for the given combination of cartridge, bullet
and gun. Actual load order can vary, depending upon lot-to-lot powder and component variations.
USE ONLY FOR COMPARISON !

68 loads produced a Loading Ratio below user-defined minimum of 90%. These powders have been skipped.
Powder type          Filling/Loading Ratio  Charge    Charge   Vel. Prop.Burnt P max  P muzz  B_Time
                                      %     Grains    Gramm   fps     %       psi     psi    ms
---------------------------------  -----------------------------------------------------------------
ReloadSwiss RS 76 *C*T             108.0     64.4     4.18    3152   100.0    58933   11850   1.221  ! Near Maximum !
Alliant Reloder-26 *C              102.9     61.3     3.97    3146   100.0    64000   11328   1.190  ! Near Maximum !
Norma MRP *C                       103.8     60.0     3.89    3123   100.0    64000   11489   1.189  ! Near Maximum !
Vihtavuori N560 *C                 105.5     59.8     3.87    3117    98.7    64000   11838   1.185  ! Near Maximum !
ReloadSwiss RS 70 *C               100.5     59.4     3.85    3110   100.0    64000   11114   1.177  ! Near Maximum !
Accurate MAGPRO                    105.8     62.3     4.04    3107    97.7    64000   11911   1.192  ! Near Maximum !
IMR 7828 SSC                       104.1     59.3     3.84    3101    99.0    64000   11424   1.177  ! Near Maximum !
Alliant Reloder-22 *C              105.8     59.3     3.84    3092    99.7    64000   11355   1.192  ! Near Maximum !
ADI AR 2213                        105.0     58.9     3.81    3085    98.9    64000   11335   1.176  ! Near Maximum !
ReloadSwiss RS 60 *T                94.2     54.8     3.55    3078   100.0    64000   10190   1.185  ! Near Maximum !
Winchester WXR                     108.0     59.2     3.84    3072    99.5    62707   11336   1.203  ! Near Maximum !
Ramshot Magnum                     105.4     63.6     4.12    3069    99.9    64000   10796   1.184  ! Near Maximum !
Alliant Reloder-17 *T               93.1     54.1     3.51    3053   100.0    64000   10118   1.194  ! Near Maximum !
Alliant Reloder-16 *C *T            98.2     53.0     3.43    3053   100.0    64000   10106   1.186  ! Near Maximum !
ADI AP 2214                        108.0     62.2     4.03    3047    98.9    62101   11105   1.190  ! Near Maximum !
ADI AR 2209                        101.9     56.2     3.64    3046    99.6    64000   10756   1.184  ! Near Maximum !
Alliant Reloder-19 *C              102.5     56.8     3.68    3044    99.6    64000   10822   1.192  ! Near Maximum !
Alliant Reloder-23 *C *T           108.0     58.6     3.80    3043   100.0    63114   10181   1.206  ! Near Maximum !
IMR 7828                           108.0     58.2     3.77    3040    98.5    59878   11288   1.212  ! Near Maximum !
Ramshot Hunter                      98.0     56.1     3.63    3036   100.0    64000   10410   1.198  ! Near Maximum !
ReloadSwiss RS 62                   96.5     56.1     3.63    3035   100.0    64000   10192   1.210  ! Near Maximum !
Hodgdon H414                        92.5     54.3     3.52    3034   100.0    64000   10456   1.200  ! Near Maximum !
Winchester 760                      92.5     54.3     3.52    3034   100.0    64000   10456   1.200  ! Near Maximum !
Vihtavuori N565 *C                 108.0     61.5     3.99    3022    98.2    58794   11527   1.250  ! Near Maximum !
Norma 204 *C                        97.2     55.6     3.61    3019    99.5    64000   10542   1.193  ! Near Maximum !
Hodgdon H4831 SC *T                103.6     58.1     3.76    3018    98.4    64000   10691   1.190  ! Near Maximum !

 

[KurtB]

I'd load up either 20-50 of the 58 or 58.5 loads, grab some shooting sticks and a backpack and go work on shooting in field positions to whatever distance you want to be good at. The loads look plenty good to me for big game hunting with a 150 pt.

 

[YZ-80]

Well, I guess I'll totally oversimplify this and say that it looks like you're on to something with that partition. I'm not sure .1 grain increments are gonna show you much with that bullet so, I'd load up 10 each at 58.3 and 58.5 again (to revalidate this charge), take your time and do two 5-shot groups at each charge. It might tell you more but I think you're close. I have absolutely no scientific basis for this but I did sleep at a Courtyard Marriot last night.

 

[Frog4aday]

Your velocity from the 58 grain to the 58.5 grain showed...nothing gained. So that looks like a 'node' to me. And your accuracy was good at both. You could play around between the two (58.1, 58.2, 58.3. 58.4) and see if there was anything special to be found in there, but at this point, IF IT WERE ME, I'd load at 58.3 grains and play with seating depth to find the 'happy spot' and call it a day. By going to that charge, you aren't losing any velocity compared to what you had at 58.5 AND it keeps you a little farther from that thin, red line of "too much" which is good if it's a hot day or your ammo gets left in the sun or something like that.

By the way, good shooting! Great bullet and caliber choice, too.

 

[howco]

If you have not already, shoot those upper end loads at 200 and 300 yards before changing anything

 

[Clem Bronkoski]

If you want your Rem to shoots "lights out" try Nosler 130 gr Ballistic Tips and 54 gr of IMR4350. Every rifle that used this load shot fantastic. My Rem 700 consistently put 5 rounds into 1/2" @ 100 yards and accounted for countless animals.

 

[cstilt]

What is the intended purpose of the load you're trying to make?

Reason I ask is because I noticed you shoot a sendero which my mind associates with long range and working up a load with 150gr partitions which I associate with closer shots that need deep penetration.

Aside from that, I like the idea of playing with seating around 58.3gr.

 

[cb4128]

Thanks for the input, the intended purpose is mid range 300-400 yards max and in; whitetail/mule deer and hogs.

Not going to be doing a lot of hiking with this rig

*leaning towards the 58.3gr load and tweaking seating depth, seems to be the general consensus

 

[csgates]

Real interested in this thread! I had a .270 built last year and I am fixin to start my load work-up. I am planning on using Hornady 140gr bullets. Keep the info coming!

 

[MOOSE39465]

I would keep the charge the same and try a Remington primer. Then if you see improvement move that bullet. Great shooting by the way. I love the 150 grain Nosler Partition.

 

[73driver]

White Tail and Mule deer don't require a partition to drop them and partitions in my experience are not easy to get anymore accurate than what you have now

 

[Frog4aday]

Wow, really? We are going to criticize his bullet choice for a 400 yard gun shooting great groups already, and he isn't even finished experimenting with COAL. That seems kind of rude. Nothing wrong with a 150 grain partition on deer. And if he pulls an elk tag...he's still good to go. Not sure I understand the nitpicking.