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Old November 7, 2011, 11:03 PM   #9
Senior Member
Join Date: October 28, 2006
Location: South Central Michigan...near Ohio, Indiana.
Posts: 5,042
When it (fins in vent lines), is caused by too much Tin in the alloy, the bullets are filled out beautifully, and the bullets themselves are just is a waste of tin though. And Tin is getting hard to find and more expensive all the time.
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