I shoot a SBE2 with 26" barrel and a .650 Sumtoy with TSS 9. Get 349 in the 10 at 40 with a 2 ounce load. The flush factory full choke that came with the gun gets 309 but I have no clue what the exit diameter of that choke is. Recoil is ok on 2 oz load with TSS, anything over 2 oz is unnecessary.