Just wondering what the brethren has to say about using this scope (the Nikon 3x9 Target EFR model) on a magnum air rifle? They are supposedly airgun rated, but.... Are these really up to the task, or should I look for something else? I HAVE used these scopes on regular (powder burning) .22 RF rifles, and I really like them and have nothing negative to say for THAT venue. But, a magnum air rifle (this one is a Gamo Hunter Extreme PRO/.22 cal) can be pretty hard on scopes, so just looking for any opinions for that usage.