What powder has given you the fastest speed for a 280 with a 22inch barrel,and not giving up any accuracy, I'm trying to work up a load with 140gr bullets different kinds, and want as much speed as possible safely. Been thinking of trying H4831,RL19, and RL22,which would give best results,or any other suggestions.
Elmer

RL-25 From 55.3 grains to 59.5 grains
Remington 9-1/2 Primer

I'll go against steve on this. My own .280 runs out of cap. w/ RL25 & lighter bullets. I would go w/ RL22 for highest vel. My own rifle like IMR7828 better. I can get 3100fps w/ a 140gr bullet & 59gr IMR7828 in my 23" bbl. IMR78228 also comes in a SSC version which allows you to get 59gr in w/o too much compression. I like RP 9 1/2 & Fed.210M primers in this load.

RL22 or IMR4831 would be the point to look for fastest loads.....accuracy is to be determined!!!

I would say that RL19 would be right in there with the best of them.