12,7x44R rifles can vary from .500 -.512 so its nice to have a bore that like the 500 s&w lead bullets.
the 50 AE and the 500S&W wave brings a lot of good things for the friend of obsolete cartridges.
I did not have the possiblity to load a S&W magnum round into the 12,7x44R but assume that this is possible and dangerous for the not so clever.
your 3 shoot group with the 12,7 is very good, take the roundball for a second shoot at close range and all will be fine. I hear that you also have a wild boar problem in texas, this is a answer