I knew He's chime in. I thought of a few more things. If you are wanting a "hunting rifle", probably the best bet would be to go for a Hawken with a 1:28" twist. The longer Kentucky or Pennsylvania types are usually a 1:60 or 1:66 twist, which only shoot PRB's. You can use PRB's here in Kali, but they have to be non-lead, and I don't have any experience with non-lead PRB's.
Most hunters use either full-bore conicals, like the Thompson Center Maxi-Hunters or Maxi-balls (NOT legal in Kali because they are lead bullets) or the Thor bullets which are full-bore non-lead Barnes X-bullets, but there are others. Thor has a trial pack that you can buy that has four "sizing" bullets in it, ranging from .500 to .503" in diameter to find out the best size for YOUR muzzleloader. You will soon find out that all 50-calibers and NOT the same bore diameter. Some states, Idaho for example, do not allow sabots.
I would seriously advise you to go for a 50-caliber muzzleloader, only because EVERYONE makes "stuff" for the 50-cal. I once had a 54 like Dan mentioned above, but no one makes a sabot for a 54 (that I know of). I was relegated to a PRB, and finding 54 caliber PRB's is sometimes a challenge.
Once you get your muzzleloader, the fun begins. Dan and I have been playing now for quite a while trying to find the best load for my 50 caliber ball-shooter. At his suggestion, I started out with 65 grains of Pyrodex Select. That's ANOTHER story...powder. Dan shoots black powder only, NOT a black powder substitute like I do. Black powder substitutes are many. Pyrodex RS, Triple 7, Select, etc. I use Select because IMHO it's the cleanest, most uniform, and most accurate...FOR MY RIFLE. Now...patches. I started out with a .015 patch and a .490 round ball, but wasn't getting the groups I wanted. I dropped the powder to 64 grains and the groups improved. Then I went to a .018 patch because the .015's seemed a little "loose" and then went to a .495 round ball. The groups really improved with the .018's and the .495, but I will be trying a .020 the next time at the range. See how much fun this is getting to be? Muzzleloading is a lot of trial and error to see what shoots best in YOUR rifle, whether it be a PRB, a saboted bullet, a full-bore conical or something else. Pick the rifle you want, then pick the powder, bullet and so forth. The rifle may be 50 caliber, but what does it like? Maybe a .490 ball, maybe a .495? What patch? All fun!