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Old January 9, 2019, 03:27 PM   #20
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Join Date: January 2, 2005
Location: Where the deer and the antelope roam.
Posts: 2,442
The OP got about 250fps increase from his carbine, over the listed velocity for the load. That's a bit more than 20-40fps...
The vast majority of the velocity is gained in the first 8" of barrel. For anything past that you gaining very little.
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