Used a Carlson's TSS .555 last year and it was great. I saw recent videos that suggested .562 IC for better patterns. I never shot the factory choke but decide to try this morning just for fun. This is the pattern with Apex #9 at 50 yds. I didn't count them, but that is a 12" circle and I was holding dead center. Had 3 shots just like that, so I'm hunting with it. The second pic is the result with the Carlson for comparison, again at 50yds and not bad.