Hi on my 375 WY I have had an old long tube Leupold 4x on it for over 20 years, and on my new CZ 550 375 H&H I put a newer version of the same scope on the rifle. They have not given me any trouble. In fact the fastest rifle to sight in was my CZ 550 in 375. Randy


US Army Ft Carson, Co 1976 to 1979