How much of a difference in Velocity between a full size 1911 [Archive] - Glock Talk

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RMTactical
08-25-2012, 19:48
and a Glock 30? Anyone know? I believe the G30 has a 3.78" barrel and the full size 1911, 5".

dudel
08-26-2012, 08:27
IIRC, each inch of barrel translates to about 50 fps. There is of course a point of diminishing returns. Handloader magazine did a story on barrel length and ACP velocity last year. Interesting story.

However you are also switching between standard and polygonal rifling, so I'm not sure this holds.

fredj338
08-26-2012, 12:17
The 45acp gives up less vel / inch than other calibers, maybe 30fps on avg. The GLock doesn't add all that much either, maybe 25-30fps max. Only way to know for sure is run your ammo over a chrono. All guns are diff, 25-30fps is within the variation from like gun to like gun IME.