I shoot the .458 diameter bullets from my LEE mold. They are a 405 grain but actually weigh 423 grains. I shoot them out of an orange Knight .458 sabot. On the factory ammo if you try to load them into a black .452 sabot, they sometimes do not sit down on the bottom of the sabot and they do not load right...

I think Midway USA sells the orange .458 sabots.