Kframe. I have never had a problem using jacketed data with cast bullets. Sounds to me like you're not getting consistant burning. I'd try increasing the charge slowly and see if that solves the problem. Sounds like your crimp should be OK. I've never used HS-6, so I don't even know where it stands on the burning rate charts. Then again, some powders, like Unique just naturally burn dirty, but in your case, it sounds more like incomplete comustion.
Paul B.
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