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Old March 13, 2012, 06:12 AM   #12
B.L.E.
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Join Date: December 20, 2008
Location: Somewhere on the Southern shore of Lake Travis, TX
Posts: 1,885
Another factor in velocity variations could be variations in bullet pull. People who have chronographed muzzle loading round balls report that if you load without cleaning, the velocities climb as the barrel gets more and more fouled. The initial resistance to movement of the bullet by the fouling increases the chamber pressure, same as a tight crimp verses a loose crimp in a cartridge.
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