Well you didn't mention it so I will guess your rifle is in .50. Your profile does show you're in Canada, so are you talking about going for moose, or just targets?
T/C makes their own projectiles, as does Buffalo Bullets,..., and there are others as well that come prelubed. You may need to try several to get a handle on which projectile will work the best. It's an odd thing about ML rifles, but even those that come off the assembly line back to back may not like identical loads.
If you're not going for Moose or are only doing targets, you might want to try patched round ball. Conical will give you a heavier kick, with the same powder charge, than will a round ball, and the T/C Hawken has a brass butt plate.
As for pyrodex, it works well, but why not actual BP? Is it perhaps due to local availability? I would suggest you get loose "rifle" powder first..., work up a load, and then see if you can match that in the pellets, IF you really want to go with pellets. My rifles like 70 grains of powder, but if you are using a .50 you will be limited with pellets to combinations of 50 grains, 60, 80, 90, 100, and such, as the .50 caliber pellets only come in 30 or 50 grain sizes. For hunting loads most folks combine the pellets, but I think this leads to complication, not simplicity, for I am told you must load a specific end down toward the breech. (that's just me) IF you have a .54..., you are limited to 60 or 120 grain loads.
Loose powder also allows you to reduce loads for target shooting, if you find for example that 40 grain loads are good for paper, and if you get used to working with loose powder, you will be able to switch over to BP if a problem occurs and you find yourself using somebody else's powder, and it's the original stuff. (Assuming you're not going to use max loads). You'll have the powder measure and be familiar with how to use loose powder.
I hope this helps.
LD