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Old January 12, 2018, 10:17 AM   #10
Don Fischer
Senior Member
 
Join Date: March 2, 2017
Posts: 1,360
You can get awfully close with a cleaning rod and a wire brush. Get the brush down in the barrel and mark the top of the brush. Pull the rod and let the brush turn by only touching the handle. When the first mark come's on top again, mark again and measure between the marks!
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