I'm happy with what they got already. I've got a .17HMR, .22Mag, .223, .243, 30-06, .35 Whelen, and 45-70. That takes care of anything I want to shoot. To exceed what they are currently making they would have to totally redesign the frame.
kevensmith5: They already is a lengthier .45LC, two in fact. .454 Casull and the .460 S&W.