The list I re-printed is not mine; it is one I found on the state DNR page of legal cartridges. The list I started with left out some of the more exotic rounds. As to the 460, according to Chuck Haws (http://www.chuckhawks.com/460_SW_Mag.htm) the overall case length of a 460 is 1.800 inches. The maximum legal length is 1.625 inches so the 460 is not a legal round according to what I have read.

As for a gun, A buffalo classic in 45 Colt would be a classy choice for a single shot. As would be a H&R in 500MAG. The choice for lever actions is almost limitless. Marlin, Ruger, Hennery, and Puma come directly to mind. Basically any cowboy action rifle should work out for this application. If a semi-auto is called for look at a Ruger Deerfield carbine.