I started out with a .58 Zuave for target shooting and musket matches. I didn't hunt much with it, and never did get a shot at any thing but a coyote. Many people in the club I belonged to hunted with theirs. One of the people had taken several elk with the.58 roundball. I know he told me he had to reduce the powder charge from I think 120 grains of 2f to some thing less. He was shooting clear through cow elk behind the shoulder.
My gun was very accurate, I was competitive with all the other rifles. I won several turkeys in the Thankgiving matches. I would think the TC Big Bore would be a excellent 75 to 100 yards elk gun. That big round ball will start to drop fast after that. I don't remember my powder charge for hunting for sure, but I think 120 gr. I was shooting a .575 round ball and a heavy patch material, lubed with melted Crisco. The recoil wasn't to bad. I carried some Minnie balls, original style civil war conicals. I shot one of them over 120gr. one time, kicked like a mule. I think I shot them with 90 grains of 2 f. They were not very accurate. We had some gong shoots that were out to over 250 yards. There was quite time gap between firing the shot and hearing the bullet strike the gong. The person that I sold my rifle to, got a cow elk with it. He said he shot at it at about 100 yards. When the smoke cleared there was no elk in sight. He waked to where she was standing and she was down kicking her last.