Great rifle, congratulations! I bet with full house loads it will get your attention. I've never shot a 460 WM but I have shot a 470 Nitro a dozen or so times and hundreds of 458 Lott rounds in 9 pound rifle. I was helping a friend do load work up and prep for an African Safari about 7 or 8 years back and we really gave the elephant guns a workout. In the Lott, there is a marked increase in felt recoil going from 2150 fps to 2250 so I can just imagine what adding 200 to 300 more feet per second would do.
That is the great thing about these big cartridges is that you can easily download them to 45-70 levels and use them for deer.