I have a picky semi auto 8mm Mauser that does not like to cycle with cast. I have read the solution to this is a heavy boolit with slow powder. So, I bought one of those LEE 8mm KAR molds, and mine drops right at 235gr with a gas check. The slowest rifle powder I have is IMR 4350.
I cannot find data for anything over 220gr.
So, I did some looking and thinking. Let me know if I'm going about this wrong, I don't want to blow myself up after all.
Looking at two different weights of bullets (20gr apart. One is 150gr, the other 170gr), I noticed that the max charge for most powders tended to only decrease by 2gr or so when going up to the heavier bullet. IMR 4350 was one of these powders.
Would I be safe to assume that I could do the same thing for 220gr data for use with a 235gr bullet? The max charge for IMR 4350 with a 220gr bullet is 45.0gr. Would a max charge of 42-43gr be safe with a 235gr bullet? This is jacketed data btw. Reducing it by 10% might yield a decent starting load acceptable for cast. Around 37.5gr or so?
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