Two options. Roundball and "Loaded for Bear" loads to use on the larger critters, or conicals.
At muzzleloader velocities on large critters, you do not want expansion. You want penetration. Assuming you plan to stay inside normal muzzleloading ranges, the list is pretty long. The Lee Target Minnie wrapped in paper or teflon cast out of about a 19-1 lead to wheel weight mixture are accurate, cheap, and will punch thru a whole lot of critter! Paper patched or wrapped, they are capable of very good accuracy over fullhouse hunting loads. My barrel shoots them just fine without patching them, but several folks have said they are too loose in some barrels without. The trashcan lid like nose profile and sharp shoulder should allow it to both drive deep and still transfer energy well. The only downside is that they are a fairly close range design because of the nose. 320 grains in 50 caliber, so it is kind of in the middle recoil wise between the larger conicals and the roundball. They work just fine on deer too!
At muzzleloader velocities on large critters, you do not want expansion. You want penetration. Assuming you plan to stay inside normal muzzleloading ranges, the list is pretty long. The Lee Target Minnie wrapped in paper or teflon cast out of about a 19-1 lead to wheel weight mixture are accurate, cheap, and will punch thru a whole lot of critter! Paper patched or wrapped, they are capable of very good accuracy over fullhouse hunting loads. My barrel shoots them just fine without patching them, but several folks have said they are too loose in some barrels without. The trashcan lid like nose profile and sharp shoulder should allow it to both drive deep and still transfer energy well. The only downside is that they are a fairly close range design because of the nose. 320 grains in 50 caliber, so it is kind of in the middle recoil wise between the larger conicals and the roundball. They work just fine on deer too!