Justin, you clearly don't know much about shotshell loading. The powder charge has to have something to push on/against to propel the load of any kind down the barrel. Here's where I was experimenting with a pumkin ball, .690 round ball load for my 870 slug gun;
The gray wad right next to the ball is called a "card" wad. It is a gas seal that is hard and stiff to give the powder something to push against. But in this case, I used it to simply take up space, because I also had a standard plastic trap wad above it for a secondary gas seal, The fiber card wad alone would have wrapped itself around the ball, the gas seal would have been lost. Normally in a shell with a round ball, you would use several soft filler/cushion wads on top of the card wad so it couldn't deform.
Now if you want to do sabots, then you need a way to roll crimp. Oh and the sabots of course.
That's a cheap harbor freight drill press with ballistic products roll crimper die and their hull vise.
That combo gives nice smooth roll crimps. But you must use new cases/hulls to do that, previously star crimped cases can't be roll crimped. Those sabots are/were the ballistic products 12/50 all in one sabot. It had a powder seal on the bottom, a cushion section and held a 50 cal bullet. It was a dismal failure because somebody screwed up on the blueprint for the internal dimension where the .50 bullet was held. The loose dimension meant there was little to no spin imparted to the bullet. If you used a .510 bullet, it worked, but no one nowhere makes .510 bullets. Why, because it's illegal for a citizen to have over 50 cal anything. Sure you can own a ma deuce 50 BMG, but a special license is required.
As for buckshot, again wads are required. Some sizes will fit inside a regular trap type wad in certain gauges and certain sizes. Buck has to be hand stacked--placed either in 2's 3's or 4's. Without a one piece plastic wad, you must do a stacked fiber wad column with the bottom/over powder wad being the gas seal. The fiber wads are all available at;
http://www.ballisticproducts.com/
You also can get hulls, slugs, buckshot and the roll crimper.