Howdy, Marengo!!
To be a RAT(s)---But ask. See sign-up post above. LIFE membersip is FREE.
Sure you can use your K-Supers. We do see some occasionally. (Modern, B-Western, 49er, Senior, etc.)
But not in Traditional, Duelist, Classic, Gunfighter, etc.
I used 'em for a coupla years in Modern, until I could afford 2 K-Vaq Bisleys.
Mustang Gregg