alaska
Well-Known Member
Retumbo most used powder in the 338 RUM
H1000
Reloader 26 with 250gr
Reloader 33 with 300gr
Reloader 22 or H1000 with 225gr
H1000
Reloader 26 with 250gr
Reloader 33 with 300gr
Reloader 22 or H1000 with 225gr
I get almost identical velocities with H1000 or Retumbo. 31" barrel , 300 grain AB, Nosler custom brass, CCI mag primer, 89 grains of either and 2810 fps. I feel Retumbo might group slightly better but they are very close.