Hi. I was wondering if anyone has tried these muzzle brakes or have them on their rifle. I know the preferred method is to have the barrel threaded but due to the lack of funds and a local gunsmith a clamp on is the easiest way for me to go. I'm also wondering about accuracy and so called harmonics. Do muzzle brakes actually have an adverse effect on one or both? I have a Rem 700 308 Tactical with a 20" bull barrel and being 64yos and not having the same fatty arms the recoil is a little to much for me LOL. Thanks.