First the mount was made by weigland combat,i bought it i say ten years ago when i bought the revolver,i dont think they make the one piece mount and rings anymore.I used to always shoot 300 grain cast bullets(federal cast cores) too much for deer,i tried the hornady and there great i honestly get two inch groups at 100 yards with them off a rest of course.Exit hole was around the size of a quarter,completly destroyed the heart,i will use these all the time for whitetails.Recoil is way less than the cast cores.for black bear though i will stick with the heavy cast bullets.thanks guys.