''Hugely reduce velocity'' Really?
Pretty to easy to test, and it doesn't. You loose maybe 25fps/Inch, Chop 4'' off your .308 and you go from 2750fps to 2650fps, you've lost 3.7% of your velocity, are you seriously concerned about that? A 165 grain .308 bullet for example, leaving the muzzle at 2750 has already dropped below 2650 after travelling 50m.
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