For some reason Bushnell use all sorts of ranging magnifications – perhaps more than any other manufacturer. They often use the highest magnification for whatever scope, in your case x15, but you can’t guess and Bushnell don’t tell! If one of the numbers on the magnification ring is a different colour from the others, that’s likely to be it, but your best bet is to measure it. Try downloading the ranging targets from here http://www.anstonftc.co.uk/targets/ (thanks again Anston).

I know what you’re getting at, but this is a good scope, and I don’t see why an x15 ranging magnification would rule it out for airgun use, provided it suits your eyes and the price and condition are right.

Alan