Why are you bothering with smoothbores?
The breach mechanism was by far the most expensive piece of the early breach loaders, so much so that adding rifling to them wouldn't affect their price in any meaningful fashion. Especially when the breach is self sealing.

As for uniforms, they did in fact remain quite colourful until the end of the 19th century, though they became much more uniform in appearance as training and supply became more and more centralized.

French uniforms anno 1889