Data point of 1: For me, my first SC match was in October 2017 (Tier II match, four hour drive one way). Joined USPSA the same day I registered for the event so I would have a membership number for SC. I had not shot any SC matches prior to this one, but I had competed in Rimfire Challenge. Similarly, I had not previously competed in any USPSA events, and still have not entered any USPSA matches.