This thread has strayed slightly from original theme of OP and could easily fit in the Muzzleloaders & Black Powder heading. However the ballistics of penetration are on point and would apply across the board.
And to be 100% historically correct for either 58 cal US Rifle Musket or 577 cal British Enfield from about 1850 -1870, one of these styles or similar would work. Left two are "3 ring" Miniés and right is British (smooth sided) Pritchett with wood base plug. All three are battlefield dropped pick-ups. The middle Minié could be considered the 58 cal version of the 69 cal Minié shown earlier in the penetration test.
