I had the good luck to speak with the main man on the BOSS R&D team, this guy shot over 36,000 rounds thru them in a tunnel, Im working from his quote here! The Winchester barrels shot better than the Browning barrels ,he did not tell me why that was the case! He said it was a common thing for a gun to shoot a 1/4 inch 100 yard group. If I remember correct as this was in the early 2000's and he had retired he was using a Leupold 36X scope and factory Winchester ammo... A lot of folk PooPoo the BOSS, Im not one of them, they will blow your eardrums out but Im deaf anyway. I have the solid weights that make em like a regular gun but on the big bores the break weight sure reduces recoil to 243 type feel.I will be the first to admit they look like a dog peter stuck out there but I am all about accurate!!! YMMV very best WinPoor