Well, I am looking for a date to set my western campaign. I want it to be after the civil war, before the Battle of the Little Bighorn, preferrably with some still free-roaming Indians and cap-and-ball revolvers still common. I was thinking 1868-70. What were the common rifle and shotgun cartridges then?
Unfortunately that date is also before the Black Hills Goldrush but from what I read there was some goldrushing going on in Montana at the time.

Also, not entirely clear on the types of cartridges. Rimfire? And what about the paper cartridges I've seen mentioned?