Do you have load data for the 170's? I don't have any manuals with it in there.
270 WSM - 170 gr EOL Berger load development
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VLD Pilot
Well-Known Member
Yep I have Berger's manual. I'll check it out and post some 170 Data pics
VLD Pilot
Well-Known Member
My Berger 1st edition manual doesn't show the 170. Only the lighter bullets. My buddy shoots it with Retumbo. Starting around 62 grains working up in .5 grain increases. He settled in around 67 grains for his best accuracy and velocity was 3055(26"bbl). Hope that helps. His OAL in the lands in 3.130. He loads at .010 off so OAL is 3.120.
My Berger manual didn't have it either. Thank you! Gives me a good place to start.
VLD Pilot
Well-Known Member
Hopefully you have enough free bore on that barrel chamber
I am having a custom reamer made so won't be an issue. Being a long action there won't be any limitations, excited to see how it performs. I'll let you know when we get it finished. Thank you for the help
VLD Pilot
Well-Known Member
Spoke to my buddy again and he also had great luck with RL26 and H1000 also. Didn't get any data but if you need additional data from these powders, I can accomodate you.
Thank you, I'll be in touch as soon as I get the barrel spun up and ready for some tests
Here is what Berger sent me before they were bought out.
.270 Winchester Short Magnum | ||||||
170 Grain, PN: 27575 Bullet, 2.944" COAL, 24" Barrel. 2/4/2016 RB | ||||||
Bullet | Powder | Start Load In Grains | Approx. Start Velocity | Max. Load In Grains | Approx. Max. Velocity | Approx. Fill Ratio |
170 Grain | Accurate Magpro | 62.0 | 2749 | 65.2 | 2895 | 94% |
170 Grain | Alliant RE-19 | 56.5 | 2707 | 59.4 | 2831 | 91% |
170 Grain | Alliant RE-22 | 59.0 | 2744 | 61.9 | 2871 | 94% |
170 Grain | Alliant RE-23 | 58.0 | 2695 | 61.1 | 2817 | 96% |
170 Grain | Alliant RE-25 | 61.0 | 2750 | 64.3 | 2886 | 100% |
170 Grain | Alliant RE-26 | 60.5 | 2767 | 63.6 | 2899 | 91% |
170 Grain | Alliant RE-33 | 70.0 | 2769 | 73.9 | 2959 | 103% |
170 Grain | Hodgdon H4831SC | 58.0 | 2684 | 61.0 | 2817 | 93% |
170 Grain | Hodgdon H1000 | 63.0 | 2730 | 66.3 | 2881 | 103% |
170 Grain | Hodgdon Retumbo | 66.0 | 2780 | 69.5 | 2932 | 106% |
170 Grain | IMR 4831 | 54.0 | 2668 | 56.6 | 2772 | 91% |
170 Grain | IMR 7828 SSC | 59.0 | 2749 | 62.0 | 2887 | 93% |
170 Grain | Norma MRP | 59.5 | 2760 | 62.5 | 2891 | 92% |
170 Grain | Ramshot Magnum | 63.5 | 2708 | 66.8 | 2854 | 94% |
170 Grain | VihtaVuori N160 | 57.5 | 2657 | 60.4 | 2779 | 97% |
170 Grain | VihtaVuori N560 | 59.5 | 2767 | 62.4 | 2899 | 94% |
170 Grain | VihtaVuori N165 | 59.0 | 2655 | 62.1 | 2783 | 97% |
170 Grain | VihtaVuori N170 | 64.5 | 2655 | 68.1 | 2817 | 106% |
170 Grain | VihtaVuori N570 | 67.0 | 2796 | 70.5 | 2967 | 103% |
That definitely helps, thank you! I called Berger yesterday and they haven't called back yet.
VLD Pilot
Well-Known Member
Great place to start and alot of powder options also. Berger is very conservative in there loads. Also the OAL is Saami spec for the .270. You'll be much longer than that OAL listed on Berger's load sheet.
I have a 1:8 twist on mine and it shoots 140's, 150's everything very accurately. Never tried a 130 so not sure if that would come unwound but everything else is shooting great groups.
I would not consider these loads to be conservative. In fact start low I have a long throat for the 170 and never got to max load without pressure. 3050 fps is going to be about max. Be smart and use caution!
I would agree with sedan. 3050 with a 170 is moving out!! Watch for pressure signs and be safe. I'm using 67.3 grains of Retumbo and my velo is 2988 avg fps. That's fast enough and enough pressure for me. Super accurate 1/2 moa out to 900 yds so far so I don't mess with it. Good to go!
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