Mount heights are usually prescribed by the scope's objective diameter to just clear the barrel, plus Butler Creek-type cover clearance if you're so inclined. Like 2Many said, ends up about 1.5" above bore centerline for sporter barrel contours and 40-ish mm objective bells. Talley Lightweights are a nice way to go on utilitarian rifles. Probably low or medium. Unless you've got a Hubble on a BR rifle....