PPC stood for Practical Police Course. It was a training curriculum back when uniformed personnel carried revolvers, which then expanded into a competition format. Unfortunately, there were no rules that effectively limited it to "working" guns, and folks began tricking revolver builds with such things as added weight (reducing the recoil to that of a .22, which gave one an advantage on the early stages of rapid fire), using mid-range .38 loads, and the like.
I still have my PPC gun, though it hasn't been out of the safe in years. Basically a Model 14, reworked by a local PD armorer with a superb trigger job, beveled chambers (for speedloading), a full-length Millet rib (with molten lead poured in the undersection for more weight) and a couple of other doo-dads. Stage 1 called for 12 rounds in 25 seconds into the B27 target, and in order to stay in the money, they all had to be in one ragged hole in the 10-ring. Wasn't all that hard to do, as I recall.