Huntz,
I can't speak for other manufacturers' products, but when Leupold calls a Riflescope "rimfire", we typically mean that it has features that make it suitable to common rimfire use. These include an adjustable or 60-yard-fixed parallax-free distance and reticles designed to appeal to rimfire shooters. Nothing to worry about as far as recoil or durability if you mount it to a magnum centerfire rifle.
