I'm at 2950 with a 123 scenar and h4350. 4831 is too slow for 120's.
I have thot IMR 4831 might be too slow burning. At 50 grs there is still room for more powder AND I'm not at max pressure. (refer to OP and Denton's post I copied)
I have IMR 4350 and will try it before buying the H version. Here our temp during season CAN get -Zero but not often. Most of the time our hunting season temps range from 60* down to @ 20* F. That's the reason I haven't chased the insensitive powders YET.
OTOH , Rl 22 has a reputation of large swings w/low temps. I have avoided it so far.
Thnx
Jerry
