So thanks for the advice the website was helpful thought I’d post a follow up. I cast some last night and went out and shot them this evening. They were a .452 300 grain Lee mold. Harvester crush rib sabot and 85 grains of blackhorn. They loaded really easy almost had me nervous but I did run them through a sizer last night though not sure they needed it shooting in a sabot. The few I measured were only 1 to 2 thousandths off. After a few scope adjustments I was able to keep them all inside a 2 inch target at 50 yards and right at dusk I shot two from 100 yards that were touching but 7 inches low....they drop like anchors. But all in all I’m pretty pleased. I didn’t know what to expect. The other concern I had before I shot them was the ones I weighed were ranging from 307 to 315 grains. Maybe that number will tighten up the more practice I get casting.