Ruger280,
In my Hornady manual (I can't remember what edition) it listed 52.7gr of H4350 as max with 139gr. SPs and 55.1gr max with IMR 4831 same bullets. In both cases, I'm over book max already according to this manual! I feel that 2900ish with H4350 is about right (again, well stated 280Rem) and the upper 2900s/near 3K is tops for IMR 4831/RL 19. I've went to 54gr. with this powder but the accuracy goes to sheet. Will tinker with the 53.5gr and probably call it good. I can't see being handicapped using a 139gr Hornady at 2900fps on any deer that I'll encounter.
