I shoot a tactical, have extinsively polished the bbl, and had forcing cone reamed and honed. I shoot the Hevi #7's through a Stardot .695 choke, with a 20" bbl and consistently shoot 275-285 in a 10" @ 40yds. I have used this combo for 5 seasons now, and it ALWAYS shoots exactly the same. I gnerally get 5-10 more bbs after a first shot.