I found this thread to be an interesting read. I have a Para GI Expert that is down at Clark's right now having a .460 Rowland barrel fitted. I got it in but it was too tight to function so I'm taking advantage of their free fitting service for their .460 kit. The gun will be getting more work done and plenty of parts changed when it returns. And I'll be posting a build/range report when it's finished.
Personally I'm interested in the lighter weight projectiles for this round, a 185gr bullet at 1550fps from a pistol is smoking. If I want big power I'll still go with my Automg V in .50AE, 300gr JHPs at 1500fps are nothing to sneeze at.
.50AE next to a .45acp