LocoGringo Posted March 26, 2012 Report Share Posted March 26, 2012 I've got an 18.5" Criterion barrel on my DPMS and am wondering what kind of velocity I might expect out of 175 grain ammo versus a 24" barrel. Twist rates are the same and both are .308 versus 7.62x51. Quote Link to comment Share on other sites More sharing options...
imschur Posted March 26, 2012 Report Share Posted March 26, 2012 this might be helpful http://ballisticsbytheinch.com/ Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted March 26, 2012 Report Share Posted March 26, 2012 From 18" to 24" you will only gain about 30 fps per inch, totaling 180-200 fps. That extra speed won't make a difference till you reach 800 yards. There is a detailed post on here somewhere. I posted a rough velocity chart from 10" to 24". Quote Link to comment Share on other sites More sharing options...
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