Perhaps not entirely on topic though related to it. I've been wondering when cartridges became common for revolvers and when for rifles and shotguns. Perhaps one of you can fill me in.

By the way, a really fun and useful generic RPG resource on old west guns is the Knuckleduster Firearms Shop from Knuckleduster Publications. It lists a great number of historical guns with stats for Fudge, which transfers into most other systems quite easily. It can be purchased through Precis Intermedia:

Knuckleduster Firearms Shop on Precis Intermedia