All the 4350's are on the slow side for top velocities with lighter bullets in the 9.3x62, but since the bulk of H4350 (a short-cut powder) is less than IMR43450 or Accurate 4350 it works pretty well with bullets from 286 grains up.
It works great in the 9,3x74R so I would guess it would work very well in the 9.3x66 and 9.3x64.
“Montana seems to me to be what a small boy would think Texas is like from hearing Texans.” John Steinbeck
I'll try some and let you know, it's a bit faster than RL-17 so 65-67gr may work with a 286gr, 68gr of RL-17 gives me a factory duplicate load (9.3x66). I have lots of H4350 so that's why the question.
