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Old February 22, 2012, 01:10 AM   #4
Jim Watson
Senior Member
Join Date: October 25, 2001
Location: Alabama
Posts: 12,165
SPG is the black powder bullet lube devised by Steve Garbe with maybe some input from Mike Venturino. It keeps black powder fouling soft. Works with at least moderate smokeless loads in cattige guns, too.
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