Talk:AT-22/@comment-4536690-20131101013119/@comment-5850386-20140624034438

it doesnt use 5.56x54. 5.56 is a .223 caliber round, not .22.

And yes, caliber has been used as a way of measuring stopping power. Obviously a .30-06 is going to do more damage (hydrostatic shock) than a needle with the same amount of propellant as a bigger round will transfer more force into the target due to increased surface area.

The AT-22 uses .22 LR.