A friend of mine shoots a .54 caliber Cabela's percussion cap rifle and it is a very nice rifle. Excellent wood, well made, and I've shot it a number of times and it is really a nice rifle to shoot. His wife bought him it for Christmas. He really did not have a lot of respect for a muzzleloader and the ability of them to take game. I helped him work up a load, and it was actually very accurate.
I had to laugh at him when he shot his first buck. He took the Cabela's rifle instead of his 30-06 because he was not having any luck that day, so for the heck of it, took that for his afternoon hunt. His buck came in at about 30 yards broadside. He was shooting a roundball. He blasted that deer behind the shoulder, and when he was telling the story kept saying.. that deer when right down. Just dropped it. He never would believe the knock down power of a .54 caliber ball.