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Old February 16, 2012, 06:37 PM   #6
kraigwy
Senior Member
 
Join Date: June 16, 2008
Location: Wyoming
Posts: 11,061
It's not a myth. Velocity does change with barrel length. How much depends on the ammunition, caliber and gun.

Here is an example. My granddaughter did a science project showing something else but she needed to know what changes to velocity occurred.

She started out with a 26 inch 308 barrel, and Remington factory 180 grn corlok bullets.

The first column is barrel length the second is velocity (at 10 ft from muzzle.)

Quote:
26 2826
24 2722
22 2713
20 2677
18 2654
16 2552
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