I never could stand 50mm scopes for the simple reasons being you have to mount the scope higher. In fact,with most rifles comb height,you'll lose good cheekweld unless you have hogjaws. I'm a big guy and I have to lift my head up off the comb to see thru 50mm mounted scopes. With a properly fitted rifle/scope/mounts combo-you SHOULD be able to simply raise the rifle to your shoulder and automatically be ready to fire without having to lift your head off the comb. When cheek isn't solidly on stock,it's not conductive to good,fast target aqquiring form and you lose valuable time and some precision under normal shooting/hunting conditions. With a 40mm objective lens scope,you can mount it lower. That's the MAIN reason I ABSOLUTELY HATE see-thru or ironsighter scope mounts.