This is relative of course but anything over 30-06 is hard recoiling to me.
I have a fascination with optics. I worked part time at a Cabela's gun counter for two years and while there mounted all scopes when on duty. I also have a small scope mounting business, I've mounted a whole bunch of scopes. Based on personal experience and the number of returns I've seen I don't believe Vortex scopes handle recoil well. The exception is the Razor, all models of which were made by LOW in Japan until recently. One of two Razor models are now made in the U.S. Vipers and Diamondbacks are made in the Philippines, Crossfires in China. Some pretty decent, tough scopes are made in the Philippines but I don't believe Vipers, Diamondbacks and Crossfires hold up to heavy recoil well. I also don't believe higher powered scopes hold up to serious recoil well until you get to some fairly high priced models and brands.