I have a Shilen , 1:9 twist.

it shoots the 75 A-Maxes pretty good.

a few times , 3 shot groups were in 2-3's , & 5 shot groups in the 3-4's.

it will shoot them better than I can.

at 200 yds, they still group very well. have not shot them beyond 200 yds. yet. expect to as soon as I get to a 300 yd. range

in my rifle both H-4895, or Varget, both using 24.5 grs. get about 100 fps more with the H-4895.

just remember the 24.5 grs. worked in my rifle, & may not in yours, so you should start lower & work up.

have 60 rds of Sierra, 69 gr. loaded up, just need a decent day to shoot them.