The Low Drag sabots, that come with the SST are made by MMP. They are the 3P EZ sabot, and they have the conical bottom, the older boxes of the SST bullets, have a longer sabot with the stair stepped base, you speak of. These sabots cause problems, in that the petal will get caught between the bullet seater jag, and the rifling. When this happens, action stops, literally.