A nice classy gun, with a big enough hole in the barrel to make it fun
Whenever I get my replacement 458 lott, I plan on sending plenty of cast bullets down the tube.
While folks may question your choice of a 458 win mag, the best answer is, a 458 win mag can be down loaded to 45-70 levels, but the 45-70 can't ever be loaded up to win mag levels.
Have fun and let us know how it shoots.