Forget sabots treat it as a 20ga rifle. Been shooting .575 lee REAL with great results. Starting over with a .62 caliber bullet mold from Lodgewood Mfg in Whitewater Wi. It casts a conical bullet at about 500gr with wheel weights. It is a Dixie gun works mold new old stock scissors type they have .40 to .70 cal. Prices at $20! There are machining marks in mold but I don't believe that will effect its purpose on white tails. Working on load development now using Blue Dot, Herco,and possibly longshot.