burnie & rod no disrespect intended but I wouldn't even consider topping a 300 wby. with a simmons scope. I have owned this gun previously and am speaking from experience. Equally important is the mounts and rings you choose, buy better to hold her tight on the boot!! Personally all I use is leupold rings and mounts now, there are others that are equal but my loopy's haven't caused me a minutes worth of worry so I just stick with them.