Shooting 100 grain bullets. I need to get a different powder for my 257 Wby. Retumbo is a bust in this rifle, with very poor accuracy... and I've got better than 1/2lb left. And while RL-19 printed OK groups, it's a little fast for this size case and performance isn't up the Wby's standards (more like 25-06).
I've used IMR-7828 with 100 grain bullets, and had great results, but I've not been able to get it the last couple times I've been to the store. I'm going to go see what they have in stock, but I want to go with a couple alternatives in mind, since the selection is hit or miss. I was thinking I'd look for IMR-7828 or 7828SSC, or RL-22 as my top picks if they have either. Also thought about H-1000, Ramshot Magnum and RL-25, but I'm concerned that the latter may be too slow. So I'm looking for input and recommendations.
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The 257 Wby will hold about 80 grains of water. 71 grains of IMR-7828 would fill them to right about the body/shoulder junction. 62 grains of RL-19 is well below the shoulder. I'd like to keep the load density between 85-95%, or 68-76 grains approximately.
Sounds like the case capacity is somewhere between a 7mm Rem Mag and a 300 Win Mag. RL22 would seem perfect. Then again, some rifles like some powders and not others.
I've had much better luck with RL22 than RL19. RL22 is my go-to powder for all our magnums.
If it were me I'd give H-1000 a whirl, my love affair with RE-22 is over, shoots ok but if you own a chrony lot to lot variation is attrocious, my 6.5 gibbs dropped 140 fps with the same charge of re-22 on the last lot change.
I've had pretty good luck with 7828 but I noticed that on average at the same velocity recoil was substantcialy more with 7828 than H4831.
I can't run 140's quite as fast with H-1000 as I can re-22 but its close and H-1000 is alot more consistant.
RR
You'd pick H-1000 over 7828? According to all the data I can find, 7828 seems to produce the best velocities with 100 grain bullets and over. H-1000 is slower than 7828, according to the charts, but produces less velocity with more powder... which is strange unless it's too slow as well. This is confusing.
mike,
according to the burn rate chart on reloadbench, 7828 is #160, H-1000 is 162, Retumbo is 167, Re-22 is listed at 154. not enough differnce to tell between 160 and 162 unless your gun tells you, like I said I'd try it, it works ok in a 270 based case so it would be better in a mag.
RR
according to Hodgdon #26 (couldn't locate my #27) max load for 100 gr bullet with re-22 is 73 gr. giving a listed MV of 3503 pressure is 52,500 cup. The max load with H-1000 is 80 gr at 3351 but less than 50,000 cup. if there is room I'd bump the charge up till I started seeing pressure signs, then back off of that a grain or two, then see what MV is. Prolly won't be quite as fast as Re 22, but it'll be more consistant. I can run 140's at 3340 with a fast lot of Re-22 in my gibbs, which has dropped to 3200 even with a slow lot, I can get 3280 with no pressure signs with H-1000, and didn't try to see what max was because I was close enough to 3300 to achieve what I wanted. My next load workup for the 6.5 will be around H-1000.
RR
IMR 7828 vs Reloder 22 in 257 Wby Mag.
And while RL-19 printed OK groups, it's a little fast for this size case and performance isn't up the Wby's standards (more like 25-06).
