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Old October 10, 2012, 05:05 PM   #2
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Join Date: May 31, 2007
Location: NC
Posts: 2,195
Yes, pressure from the powder burn continues to push the bullet down the barrel, and the bullet leaves the barrel while still being pushed. In fact, a .357mag shot out an 18" rifle barrel gains velocity over a 6" revolver, so technically, it takes at least 18" for this cartridge to reach it's full potential. More relevant, then, is how much barrel do you need for your .357mag to do it's job.
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