I have a Husky 350 and the bores measure .719/.718 which I think is pretty typical. It is choked .028/.038 and I considered having the chokes opened but it shoots such wonderful, tight patterns I'll never touch those barrels. I shoot is at all types of clay games, ducks and doves. Even skeet. Husky sure made nice guns. I'm not sure why you are having trouble. Mine is death with bismuth.