Re: Muzzle breaks and accuracy ?
Sometimes... But generally if its done right the worst case is just a shift in point of impact, which is quickly fixed by rezeroing your scope.
If its a bad job then yeh maybe accuracy might be screwed but this should be unlikely.
If your worried you could always put a Roedale brake on... if you dont like it, take it off and sell it and your barrel will be the same as before.