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I read about a 22LR velocity test (6-8yrs ago) where somebody took a long bbl bolt gun and began to saw it off and re-crown in 1" increments, IIRC. Velocity increased going shorter until the test gun reached 16" of bbl length. They theorized that frictional losses slowed the bullet past 16".
Under 16" the velocity began to get slower with the theory that gas did not have enough time to work on the bullet or all of the powder did not burn, etc.
Interesting test. I read this a long time ago and think that I remember velocity was the only consideration. I suppose a different bbl or cartridge could result in slightly different results. I'd like to read that one again, but not sure "where I was" on the net when I came across it--maybe rimfirecentral?
Not sure that tuning a gun for max velocity has anything to do with how accurate the particular gun would be however.
Nail
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