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All lead bullets work best when at least 0.001" larger than bore diameter. I shoot lead bullets almost exclusively from all of my handguns, in calibers from 9mm-45colt. I used to cast quite a bit, but it is time consuming & unless you have access to cheap or free alloy, it's hardly worth it for blasting ammo. Just buy them from a hobby caster, there are many.Most if not all Speer's lead bullets are swaged. These work best when they are .002 larger than the bore. They allow the gas to get around them and melt the lead/lube if they aren't oversized.