You may have some bullets with extra lube on them. Burning lubricant can produce that smoke and mess. I've never used Titegroup, so I don't know anything about the powder itself. Some powders, like Unique, create a lot of "residue", also.
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If God didn't want us to own guns, why did He make the 1911?
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If God didn't want us to own guns, why did He make the 1911?