Snakum
Member
I've always read that I'd lose X amount of velocity if I cut the barrel of a 7mm mag rifle. Estimates ranged from 30fps/inch to over 100fps/inch. But today I read that Tac Ops magazine and a California Sheriff's dept. both independently tested this theory in 308 and 300 mag bolt guns. IIRC, they found that going from 24" to 18" on a .308 saw a total decrease of something like 34fps. And cutting a 300 Win Mag from 26" to 22' saw NO decrease in velocity, though it was expected that below this the velocity would certainly drop off. IIRC the rounds used for both were Sierra MatchKings at 168gr for the 308 and 220gr for the 300WM.
So my question is ...
Are there other variables that might have affected their tests?
If I went to 22" on my 7mm Rem Mag might I see minimal velocity loss as they did with the 300?
Have you guys ever cut a mag barrel down before while measuring the effect on velocity with a known load and a chrono?
So my question is ...
Are there other variables that might have affected their tests?
If I went to 22" on my 7mm Rem Mag might I see minimal velocity loss as they did with the 300?
Have you guys ever cut a mag barrel down before while measuring the effect on velocity with a known load and a chrono?