Can the installation of a muzzlebrake effect accuracy, not only from an installation stand point but from changing pressures in the barrel (POI)? Are there big differences in the effectiveness of different brakes or of the intended purposes of different brakes, i.e. one kind better for benchrest, a different kind for coyote hunting, etc. I've read some of the old posts and some of the websites (JP, etc.) but would still like to hear from a few of you that have had experience with them... Also, do they need to be welded on or can they be left threaded with a cap?