Home Forums Reloading Big Game Rifles 257 Weatherby - IMR 4831

I have a brand new .257 Weatherby to play with (Remington 700 CDL) and I have all of the "go to" powders for the cartridge as I had a Mark V POS that kept sucking me in. Powders on hand are H-1000, RL-25, RL-22, RL-19, IMR-7828, IMR-4350 and IMR 4831.

Everything I read leans towards something other than IMR-4831, but in looking at my Nosler manuals (I have volumes 3, 4, 6 and 7) IMR 4831 is always listed for the 100 grain bullets, and always has the top listed velocity. Yet, it is a rare case indeed to hear of someone using this powder in this cartridge.

Is there anyone out there that has tried, or is currently using this powder in this cartridge? If so, do you mind sharing your experiences. I have roughly 10 pounds of it with no other use currently.

I will be attempting to work up some fast and accurate loads utilizing the 100 grain Swift Scirocco.

Thanks.

One good load was with 115 Berger and 71.2 gr. RL-25. COAL was 3.260".

DF

I always had good luck with RL22 and IMR 7828 in the .257 Wby.

72.5 grains of Re22 100 gr bullets seated to 3.170 will stack em and come in around 3800

Just bought 8# of IMR 4831. I have had good luck with IMR 4350 with 100 and 115 grain Remington and Noslers. Haven't tried the 4831 yet. I just found a NIB Classicmark from 1992 to go along with the M700 CDL SF I have been shooting. The best Factory load so far is the 117gr RN with groups, 5 shot, running just under an inch. The hand loads around 1.25 MOA out to 285 yards. Everything shoots in the same group so far.

Wish I could find some IMR 4831. Powder Valley is out.

Am loading for a good bud's .300 WM. It's a Parker Hale that I refinished. The barrel is a bit worn, but for some quirky reason, it shoots sub inch with 180 gr. NBT's and 71.4 gr. IMR 4831.

And, I'm on my last pound of that powder.

DF