I am a colorado resident so I have no experience with sabots, even when I go out of state, I still shoot full bore size bullets.
I own 3 muzzleloaders, a .54 cva woodsmen, a .50 t/c thunderhawk, and a .50 t/c triumph. The first two, I have shot at and killed multiple animals but the last one, I purchased for a specific elk hunt that never happened but will this year, I have never shot at any animal. I have shot power belts, fpb and thors through both of my .50's. I will say this about the power belts, no matter what size I use, whether or not it is hollow or tipped, they all seem to come apart way to much and don't penetrate deep enough for my taste. Maybe for deer, which I have shot mostly with them, but not elk would i trust the penetration of the power belts. I tried the Hornady fpb, but they are hard to load the first time and almost impossible to load with a dirty barrel. I think the fpb stands for " for picky barrels"

I tried the Thors on recommendations from other members here and other m/l shooters I know and am totally happy how they load, shoot and foul my barrel. The only question is how they will work once they penetrate elk. Everyone I talk to like the penetration and how they hold together. I know they can't be any worse than I experienced with the power belts. I use 777 loose powder to push these guys and hope that it puts down a rather large bodied elk , which hopefully translates to a 350" elk or bigger, when I draw my elk tag with 21 pp. I really want to take my shots from 35 to 100 yards but will expect and be ready for shots up to 150 yards. That is my .02 cents worth.