Although I realize that there are people there that manipulate what is allowed by using high powered rifle rounds fired from a TC.
Dude, that is not manipulating the rules. These guys compete with handguns at 200 yards. There is a reason they use rifle cartridges! It isn't to annoy you, and it isn't to prove a point. It's to hit tiny targets placed far away under the stress of competition.
How often do you go there?
I saw one of the members shooting a .308 "pistol" there and purposely hitting the frames of the targets at 50 yards.
Every time he would hot the frame, it would fall down and he would laugh. He actually broke two of the targets and some of the other members there laughed with him.
There was no 200 yard competition going on and there was no stress in shooting a scoped .308 at 50 yards.
The honest truth is that pistol caliber carbines (9mm, .40S&W, .45acp, etc...) woild do considerably less damage to the metal targets than rifle caliber pistols.
When I talked to the RO after the fact, he said that it wasn't the club (HMSSA) that banned pistol caliber carbines. He said that "Kokohead" (powers that be) did not allow them. (He was real nice about it when he said it)