Thanks for your replies, guys!
Pancho, I'm shooting SASS, not NCOWS, and there is no "Working Cowboy" class in SASS. The decision to go period correct is mine, not rules.
The nearest NCOWS group that I can find is about three hours away! Besides, I like the focus on shooting in SASS. Not that I'm trying to talk down NCOWS. If I ever give up Civil War reenacting, I might switch to NCOWS (if, by that time, I can find something a little closer), but I just don't have the time to devote to NCOWS (which is essentially cowboy reenacting, the way I understand it) and CW reenacting. Right now, all I want is a day to dress up cowboy and go shoot. SASS fills that niche for me very nicely.
Thanks again!
~D