I'll go #2. That sounded wrong.
We could raid the Wheelgunners for members, and include traditional blackpowder shooters.
But since Single Action Shooting Society (SASS) is probably the copywrited name of a business, I think the more general term Cowboy Action Shooting would be better.
We should also open it up to Civil War re-inacters and buckskinners, in fact everyone who is interested in American shooting before WW1.
"He said he fired a burst at the chest and if they didn't fall fast enough, he fired a burst at the face. He never needed to reload and had enough on board so if he missed a shot or two he could catch up in the fight. " -Gabe Suarez, 2008