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I am working with a Wby Accumark 26" barrel and the 115 Berger VLD's at this point. I do have some 115 Barnes TSX as well to try out.
What powders are useful to pull some speed out of this combo?
I tried h4831 and Fed GM215m primers over the weekend and did have a good load at 67.5 grains. 19 FPS spread and groups were averaging .70" @ 100 yards but was only getting around 3150 fps before mild pressure signs showed up.
I'll take accuracy over speed any day of the week, but I think there might be a better powder to accomplish this.
Turn me loose, set me free, somewhere in the middle of Montana!
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Campfire Ranger
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Campfire Ranger
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IMR 7828 was a laying on of the hands for my 240. Several friends like it too for 257's and 300's. We all get published velocity.
I started a Mk V 257 on Reloader 22 and it does OK. Based on my buddies results, however, I'm going to IMR 7828 when the current loadings are consumed.
Last edited by 1minute; 12/16/13.
1Minute
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Campfire Tracker
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So far, IMR-7828 has been best with 110 and 115 gr bullets in mine. I am trying Ramshot Magnum, though.
�That rifle on the wall of the labourer's cottage or working class flat is the symbol of democracy. It is our job to see that it stays there.� George Orwell
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I have had my best luck with RL-22
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Life begins at 40. Recoil begins at "Over 40" Coincidence? I don't think so.
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Campfire Tracker
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RL 22 in my Wby Fibermark gives me 3700 fps with the 100 gr TSX, along with superb accuracy.
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Campfire 'Bwana
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Campfire 'Bwana
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RL-22/MRP (same powder) has always worked great
A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”
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Thanks guys...Looks like I'll have to pickup some RL22 and give it a try.
Any estimates on velocity with the 115 gr's?
Turn me loose, set me free, somewhere in the middle of Montana!
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Do you know the velocity on that load? Nice group btw!
Turn me loose, set me free, somewhere in the middle of Montana!
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Campfire Ranger
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Campfire Ranger
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I would guess about 3100 fps
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Campfire Oracle
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Campfire Oracle
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I use IMR 7828 69.0 grs and a 117 gr Sierra flat base,it's getting an average of 3258 fps. Oh and a CCI 250 mag primer and 26" barrel.
Life Member SCI Life Member DSC Member New Mexico Shooting Sports Association
Take your responsibilities seriously, never yourself-Ken Howell Proper bullet placement + sufficient penetration = quick, clean kill. Finn Aagard
Ken
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Campfire Tracker
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Another vote for 7828......but, if I was starting over today with the 257 WBY, my first try would be with RL-33.
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Sooner or later our heritage of hunting is going to be a rich mans sport and the words "Outfitter" and "Hunt Industry" will be synonymous with cancer and A.I.D.S. among blue collar hunters like me and my family! (A.L. Williams - 2010)
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Im getting 3325 with a 115nbt from 7828 and 215m from my 257wby.
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Do you know the velocity on that load? Nice group btw! I never got around to checking the velocity. I tried several powders that included IMR 7828 and H1000 and got the best accuracy with RL-25. I know it's fast enough and I'm much more enthusiastic about getting good accuracy than about getting maximum velocity.
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Campfire 'Bwana
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Campfire 'Bwana
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Velocity is critical, especially with actions less strong than the MKV. Here is my go to load: 71.3gr RL-22 F215M primers Norma/Weatherby brass MV: right at 3740 100gr TTSXs (but the 100gr TSX and Hornady SPs shoot to POI as well):
A good principle to guide me through life: “This is all I have come to expect, standard lackluster performance. Trust nothing, believe no one and realize it will only get worse…”
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Velocity is critical, especially with actions less strong than the MKV. Here is my go to load: 71.3gr RL-22 F215M primers Norma/Weatherby brass MV: right at 3740 100gr TTSXs (but the 100gr TSX and Hornady SPs shoot to POI as well): That is pretty much the same result that I have with mine. It shouldn't be powders but powder, namely RL22 in any I've worked with. 72 grains and a 100 TTSX is the recipe.
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