My 23" shurshot shoots long beards well with any choke from .660-.665, I have 5-6 different chokes but It shoots amazing patterns with the longbeard xr choke. I would shoot what you have before you buy a new choke unless you just want a new choke, and I understand that thought, I would try a longbeard xr for sure.
40 yards, 3.5" lb 6's.- LB xr choke.