Re: Question regarding muzzle brake install.
A careful machinist should be able to install the brake without damaging your finish. I know I could when I worked in a machine shop because I would have wrapped the barrel with paper before chucking it in the lathe. Ask potential gunsmiths about possible marks & see what they say.
If you are bothered by long guns & you are hunting in close quarters, you may want to shorten the barrel. I never would because I want all the performance I can get from this cartridge, a longer barrel reduces muzzle lift during firing, a longer gun points better for me, and the longer barrel gets the muzzle blast farther from your ears.