Just looked it up in the book. All my .22 LR Winchester ammo is super-sonic.
Supersonic is 1100 fps, at sea level, standard atmosphere.
/johnny
I know this much....I've shot many 1,000 of rounds of .22 short and long...and 1,000's of rounds thru that CZ pistol....and that 7.26 x 25 is one loud ass round. Way louder than any .22 round I've shot.
I have just been....advised that it's a waste of money to buy a suppressor...if you are using super-sonic ammo. What do I know? I guess I should have been specific....
I've .308, .270, .243 rifles....I couldn't tell you what is the loudest though. Just bot the Winchester model 88, in .308...and love it. Less kick than the .270...I think, and shoots just as straight.