I just got one and it shot quite poorly with the 3 ammos I tried: Winchester Dynapoint, CCI maxi-mag, and 1 other (I think it was also a type of CCI). Groups at 50 yards ranged from 2" to 4" - completely unacceptable. So, I am very glad to know that it *may* shoot Winchester SuperX 40s and Remington Premier 33s well, so thanks Gary & Ed. Beautiful gun, and sure would be fun, if I can get it to shoot well.