Sabotloader I believe shoots them in his .52 caliber Knight. I also shoot them in my .50 calibers. Knight makes a sabot (MMP) that fits the .457-8 bullet. I cast these out of pure lead. They weight in out of pure lead at 421 grains give or take. They actually are good shooters, but I never shot them past 100 yards. I also size them down to a .451 and then shoot them out of my Model 97 White .451 rifle as a conical.