270 WSM - 170 gr EOL Berger load development

VLD Pilot

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Yep I have Berger's manual. I'll check it out and post some 170 Data pics
Yep I have Berger's manual. I'll check it out and post some 170 Data pics
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.
 

Rep 284

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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.
 

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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

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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.
 

Rep 284

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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
 

sedancowboy

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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%​
 

Rep 284

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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

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Messages
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Location
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That definitely helps, thank you! I called Berger yesterday and they haven’t called back yet.
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.
 

Raudy707

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Location
Mendo
JTB, just finished a phone conversation with a gunsmith on a new barrel for my .270 Wby going to 1:8. After reading your thread looks like it does quite well. Was wondering if the 1:8 would work with the 150 VLD if I wanted another load besides the 170's. The 170 will be primary.
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.
 

sedancowboy

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Messages
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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 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!
 

Raudy707

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Messages
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Location
Mendo
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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