I have owned my Disc about 8 years, here are my pet loads...

Current...80grs Goex FFF and a 300gr Hornady .430 XTP with the green Harvester sabot (not crush rib)

85grs Goex FFF and a .250gr Hornady .452 XTP with the MMP-24 sabot...

80grs Goex FFF or 90grs Pyrodex R-S and the TC or Hornady SST and the MMP-24 sabot...

100grs Pyrodes with the 300gr Barnes MZ bullet and supplied sabots...

The nice thing is the 250 Hornady and the 250 SST loads both hit 2-2 1/2 high at 100 yards...The 300gr .430 XTP hits an inch high and dead on at 125 with no scope adjustment and these loadings...