Black powder weapons
Black powder would have been common lower cost weapons in the late 19th century. Implementing black powder rifles and or revolvers could be an interesting way of adding powerful low-cost weapons. For example: a Springfield musket which could do great long range damage, but have a very long reload time and produce a big smoke cloud giving away the hunter's position. Revolvers like a Colt dragoon or Navy/Army could also be interesting as low cost alternatives to higher damage pistols at the cost of slower reloads and smoke.
Agreed alc57. It would have been the cheaper and possibly more common option.
I'd go so far as to suggest not just muzzle-loading black powder weapons, but a large amount of cartridge ammunition from the period would be black powder, which produces a significant amount of smoke on ignition. Smoke reveals firing positions, or can be used for a mini-smokescreen.