A good gunsmith told me that a "good" muzzle brake, could reduce the recoil approx 20-40%,...but it also depends on the caliber. He said some (brands) muzzle breaks work better than others. I would talk to a good gunsmith that installs muzzle breaks, about how much it would affect your particular rifle....& which brake to use.
I sighted in a friend's 7mm Rem Mag last year for him, model 700....& the muzzle break reduced the normal recoil by at least 20-25%. It was noticeable.