Sorry, too early for me to read so much above - I'm sure it's all good, but I'll throw my 2 cents in as a non-cowboy-but-gun-club-president.
My club had a guy try to start up his version of cowboy shooting and after a couple comments from concerned members, I and my board put a stop to it.
He was setting up courses of fire with close junk steel (concave would be putting it mildly) , allowing 30-30s, modern revolvers shot single action only, running with guns in slick cowboy boots, starting with 6 in the chamber in the holster and of course, all with no formal certification or training for the participants.
His concept of Cowboy Shooting was basically IPSC / Multigun with no semi autos and cowboy hats.
Reading the SASS rule book made us much more comfortable and we decided that if the guys would follow SASS rules (decent steel, pistol cal. carbines, staged guns, single actions starting with empty chambers, etc.) we were comfortable with the safety levels involved.
The original organizer bailed (didn't like having to follow SASS rules), but we got some good guys in and haven't worried about it since.