Might want to try a couple of different chokes and constrictions with whatever load youre going to use. Currently shooting a Carlson's .575 turkey choke with 3" Federal Premium Grand Slam, #5 shot out of a Mossberg 20 gauge. Interestingly, the .575 actually shoots a slightly more condensed pattern than the .568 Carlson's Long beard choke I also have. Would love to try some of the Winchester longbeard XR out of each choke but they've been pretty much impossible to find. I just can't bring myself to pay $9-$10 a shot for TSS yet.