1858 is a cap-and-ball revolver. I don’t know about using it for deer. Fun to shoot, though. Not a firearm, so you can mail order one and it shows up at your door.
In .45LC, are you thinking of putting on a cartridge conversion cylinder? These work great from what I’ve heard. I think you have to use down-loaded “cowboy” loads in these.
yeah - i had heard cowboy as well - have plenty and coupled with the others posters comments about BP firing near my face/eyes - Im leaning 45 colt for plinking now