Wanted to thank y'all for the help. The Harvester black ribbed sabots work great. After three shots to adjust the scope(2.5x20 Leupold w/hvy plex) two shots with a 250gr Hornady XTP,Fed 209A primer,and 70vu of BH at 100yds were 5/8" center to center(holes touched edge to edge). I'll bump the charge up at some point.