I have some .458 caliber Lehigh Defense Subsonic Fracturing bullets that I purchased last year from an ammunition loading company that sells their surplus bullets and brass on this site. They were mislabeled and supposed to be .510 cal, I have no use for the .458's I got. They are free to a good home, shipping on me (U.S. only). Enough of them to play around with and see if your rifle likes them, or to make a sub load.