Kyle,
This question was (finally) answered correctly in March. The SCT was a drill invented by Jeff Cooper; it was a "Standard Controlability Test," which determined if you could control your handgun with the loads you were shooting. It went something like this:
25 yds, gun in hand, 6 shots into a 10" circle, which was the A zone of whatever the IPSC target was then. (I think it was the "Option") All shots had to be in the circle to pass the test.
Brian