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300wsm and a 168 amax?

For all out velocity run rl17 from 66.0 up through 68.0 grains and look for pressure. I've seen some guns peak at 66.5 and some at 67.5, but the velocity exceeded 3200 fps. If consistency is what you're after, H4350 will work in nearly the same load range starting at 65.5.