The Complete Reloading Manual for the .460 & .500 S&W Magnums (One Book One Caliber): Loadbooks USA: Amazon.com: Books
Both Lee and Lyman loading data state that the minimum OAL for a .460 S&W is 2.160", however at this depth, the bullet still isn't near the cannelure. Is it still safe
460 S&W Magnum - Wikipedia
Smith & Wesson 460XVR Revolver - X-Treme Versatility