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I had leading in my gp100 with .38 special loaded with 4.5 grain win 231. Then heard some more velocity might help " seal" the lead projectile.... Didnt make things any better. Turned out they were way too undersized.
Well you can do what I'm starting to do and that is cast your own, I believe you already stated you cast lead shot, casting your own boolits is the logical next step.