Thread: Subsonic 22lr going supersonic?

Originally Posted by rambo-6mmrem

was it cci subs or cci standard most think its the same speed but standards are much faster than sub just on the verge of breaking the sound barrier so close that one on 3 or 4 dose most target ammo including laupa magazine above is standard not sub a true subsonic round should never break the sound barrier

CCI rate their Standard Velocity round @ 1070 fps whilst their Sub-Sonics are 1050 fps - virtually the same. Speed of Sound is generally 1127 fps so they both should be well short of that. I use both CCI Subs and Standards for general plinking (use better stuff if I want better results on the day) and have fired off thousands of them and have never perceived any noise difference. The only downside with CCI shows up when shooting on paper - both Standards and Subs seem to put the odd shot out of the group which could be caused by a different velocity for that shot - maybe higher or lower. I also have chronographed a lot of different 22s and the CCIs were roughly as stated on their packets thru a standard length barrel.