Barrel harmonics are affected more by load development than by a 3/4 oz. weight hanging off the end of the barrel. Besides... as I have stated in previous posts... I think people get hung up on getting every last 0.1 MOA out of their hunting rifles... I don't think it is ethical to take shots at game beyond 300-350 yards, so a 1.25" group at 100 yards is more than enough accuracy for anything deer sized and up. And yes I do believe PEOPLE shoot their rifle better with a brake on it because there is less recoil and therefore less muscle tension involved. Don't blame that on the mechanics of the barrel harmonics though. I'm not being condescending. I'm just saying, if my rifle isn't accurate, it's probably me or something much more significant that's wrong. If your talking about .2MOA difference, I'm not concerned about it. I'll never notice it anywhere but off a bench.My 416 Ruger Will drive tacks with the brake. The thing about breaks is they have to be the right wall thickness to be compatible with the barrel harmonics that is what Don Allen of Dakota arms told me years ago when he was living.