At an auction a few years ago I bought a Ruger #1 in .220 Swift. It had a muzzle break already installed. Why someone would think they needed a muzzle break on a .220 - I don't know. Anyway, accuracy was poor, but then I discovered that the break was mounted crooked. The projectile was striking the edge of the muzzle break as it exited the gun barrel. That may by why the unknown person put the rifle in the auction. Anyway, I had a gunsmith reset the break. The rifle shoots just fine now, but I do think the muzzle break makes the report a lot louder.