I shot a Carlson's .575 out of mine with the 9's and it did 260/250 at 40 yards. My brother uses a Undertaker .582 in his and it shoots 280/240 at 40 yards. The Tru-lock .585 did really well too. The cheap chokes do just as good or better than the high dollar ones. If I was going to get a Sumtoy, it would be a 562-5 for the 9's.