I found one site where the Zouave was listed with a 1-66 twist, and I thought what a nice roundball rifle. I wonder if it would like a .570 or .575 ball and patch combination? Most of them started their loads with 70 grains of powder but some people really pushed them much harder.

Last I knew Black Jack Hill had minnies for that thing. And I think they measure .577. I had some and they did not shoot well out of my .58 caliber.