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Old March 22, 2013, 01:00 AM   #7
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Join Date: January 7, 2008
Posts: 1,355
Depends on the Powder.

A light charge of fast burning powder will reach peak velocity sooner and begin to drop pressures below the point of further gains; so that 16" barrel may very well shoot faster with such a load. However, a heavy charge of AA-9, IMR-4227, H-110 and the like will make the longer barrel shoot substantially faster.
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