Shot it in my cz452 lux at 25 and 40 yards today. Great great stuff. Boom every time, consistent noise levels, 1/4-1/2 in open sight groups. Only one neg....very dirty. Didn't affect groups at all. Also functioned in my 10-22 w out a hitch. Wasn't as accurate as Remington but I'll blame that as I shot only one group of it