For a .50 caliber I cast a .457 LEE 405 grain bullet. I can load that in a sabot and they shoot real well. Or I can size them down to .451 and shoot them out of my White M97 with some amazing accuracy. MMP sells an orange sabot that fits these bullets. Some people claim you can load them in a .452 sabot. One of these days I will have to try some of them I sized down in a .452 sabot and see how they shoot.