I have a Traditions .54 cal. with a 24" 1 in 48 inch twist and have had problems working up a good load for round balls with it. When I was trying to find a good load for round balls I tried some sabots also. They shot extremely well. I was using the orange .45/.54 Thompson Center Mag Express .54 caliber sabot and a .45 cal. 240 grain XTP with 3f Goex. I was disappointed because I bought the rifle to shoot round balls with. My next step will be to try some old blue jean patches and see what happens. Here's 2 targets at 100 yards.
3 shot group.

2 shot group.