The South would not have afforded it or used it very well, the North would have had far too much fun and games with such a weapon used in a protracted offensive. The North could use them to enhance their existing numerical advantage, but the very complications of logistics for such weapons means they have to change their whole tactical-strategic concept. Winds of Fate has the North adopting Gatlings and breechloaders and I might note that a sufficiently competent Civil War general would be more than able to win with muzzle-loading rifles against a Civil War army armed with both weapons. The North would be able to afford them by 1864 when its industry was in full wartime gear, but Civil War terrain and technological levels in several occasions might actually favor the muzzleloader over the breechloader. Civil War terrain actually favored muzzleloader artillery over its rifled counterpart, the nature of wooded terrain in Virginia at least would to some extent counterbalance the greater firepower of breechloaders, as would the simple problem of shooting and missing.....