The most abusive factory load I shot in the .460 XVR was Corbon's 395 grainer. That one got your attention!
Whit, that's like a "brisk warmup" for your 50AK!
TN LW, I'm with you, I like to run the FTX bullets in my 460, and plan on experimenting with the Barnes in both 200 and 275gr options. I've got other platforms that sling the heavies without being overly abusive