You don't need to do that any longer, you can shoot the TC bullets in your TC, just switch the sabot out and buy 1 package of MMP #24 and 1 package of MMP EZ-3petal and 1 package of Harvester Crushed Rib sabot.
They are about $7/package, you then can get a good loading sabot, that checks the gases. However be aware of this rule

"the harder they load, they tighter the groups, but they have to load".

So choose the sabot that loads the easiest and shoots the tightest groups:

"ya gotta shoot a lot of different combinations before you find your best load/bullet/sabot with any given rifle".

If you a good CF bullet and like it's performance on game, find the corresponding rifle bullet in 45/70 (the are .458 in diameter)and buy some ORANGE MMP sabots. Work a load from the manufacturer recommended load (usually 2 Pellets of 777 or Pyrodex).
Chap Gleason