Quote:
Originally Posted by OKFC05
Compensators on IPSC open guns use high-pressure cartridges and thereby reduce muzze rise. Velocity loss is minimal. Blast into the official's face from a kneeling competitor is considerable.
Porting on low-pressure cartridges like .38 special are of questionable benefit. On a short-barreled defense gun, there is the question of just how much blast and flash you are willing to tolerate, particularly in low light. Shooting from close retention with a stubby can get exciting.
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I agree with this,
As far as velocity loss goes- the ports are so close to the end of the muzzle that there simply isn't time for any drop in pressure to possibly affect the velocity. That can be proven with two identicle guns, one ported, one not, and the use of a chronograph.