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Old September 3, 2012, 01:58 PM   #4
Creeper
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Join Date: September 9, 2008
Location: Woooooshington
Posts: 1,797
A handgun cartridge can gain 100 fps (more or less) per inch of added barrel length (to a point of diminishing and then reversal of returns), so if you're comparing your 7.5" velocities to those from a 5-6" revolver, the increase in velocity makes perfect sense.
There can also be dimensional variances in cylinder gap, forcing cone and barrel land/groove diameter that, although you'd think not much of a control, can account for some of the velocity increase.

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