Comments on: Barrel Length and Velocity — Barrel Cut-Down Tests

By: Guy

Guy — Tue, 23 Oct 2012 21:47:56 +0000

I have several Krieger barrels in both 20″ and 26″. The average fps difference with a identical load is 18 fps. I believe the fps change is reduced beyond 27 or 28″. This seems to be the case with my 30″ LR barrels.

By: Bruce Dunavin

Bruce Dunavin — Mon, 02 Jan 2012 22:56:36 +0000

At 3000 fps,it takes the bullet about 28 micro seconds to go one inch. This extremely small increment of time is insufficient for the pressure inside the barrel to have much of an influence on the speed of the bullet at the end of the barrel, so these results are not surprising. I think intuitively, folks would expect the velocity to be higher but the math supports the results. It would be interesting to see results of a 20″ barrel but based on the small amounts of time we are dealing with, I expect the speeds still would not be that much different, and certainly not much influence on energy or killing ability on game you would be hunting with a gun with a 20 inch barrel. I doubt if you would have 100 fps difference between a 26″ and a 20″ barrel.

Bruce

By: Greg Verner

Greg Verner — Wed, 21 Dec 2011 18:06:43 +0000

Although interesting, many of us shoot barrels shorter than 28″, this test should have continued until the barrel was 20″, as I would be curious what the loss of velocity is between a 26″ and a 20″ barrel.

By: ab_bentley

ab_bentley — Tue, 20 Dec 2011 22:15:52 +0000

Also what is shows is the effeciancy of the BR case. Adam

By: James Downey

James Downey — Thu, 05 Feb 2009 21:19:05 +0000

You may also be interested in the results we obtained for handgun calibers: http://www.ballisticsbytheinch.com/

Cheers!

Jim D.