All of my most accurate loads for my 454s were at the top end of the scale. Old load with FA brass was 31.5 of 110 under a 300gr XTP mag 5 shot string was 1704fps. Current load, Starline brass, is 32 of 110 everything else being equal. A half a grain makes a big difference at least the way I load. Anything under 30gr for me is horrible with that bullet. I also taper crimp when I seat the bullet (45acp die) then I crimp with the normal RCBS die.