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Old February 4, 2013, 07:40 AM   #3
Senior Member
Join Date: February 2, 2010
Posts: 4,333
There is little/no correlation between different barrels since the are simply too many variables. One bore might be slightly smoother or slightly tighter/looser or one rifling might create more drag. Even two identical rifles might show a significant difference in actual velocity with identical ammo.
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