hi : i have tried these in a cz 452 and hit the target at 50 yds once or twice with keyholing bullets out of 5 shots , so they went in the cubboard thinking i will probably not use them again , a few months later i got a paco kelly tool and tried them in their and they shot good , good enough any way to hit 2 starling sized birds at 90 yds with 5 shots , so i went and bought a brick of them they are fun to shoot if they shoot accurately vorquatsen also makes a 1 in 9 twist barrel for this round .
jim