2 things,
1st do muzzle brakes make even .22LRs much louder? My 10/22 is so quiet it`s almost boring to shoot,making it a little louder would at least make it feel less like shooting an airgun.
2nd, I was helping a friend sight in the new scope on his braked FAL a few years ago. It was ,as mentioned above quite loud. After a few shots at 25yds. (to get the scope rough sighted) it suddenly got somewhat quieter...the muzzle brake ejected itself from the muzzle and was embedded in the dirt backstop!
Marcus