If I run standard velocity in my takedown 10/22 with a 12" barrel there's no crack but the same ammo will crack with my 16.5" contender.
Hmmm...
Most (if not all) standard velocity ammo is subsonic (in any barrel length) and would not have a supersonic crack. Suggest you change to a different brand of 'standard velocity' ammo (if you can find any).
I've had Remington 'subsonic' ammo sometimes (like 3-4 out of 20) give a supersonic crack. Simply because quality control was not very good and they were going supersonic.
Jerry
