I have a friend who has both the 458 Socom and the 25 WSSM. I have watched pigs hit the ground so fast it was unbelievable when hit by the Socom. His 25 shoots ragged holes but it sure is a barrel burner. And no, I don't have the 23 ca. Interesting, in P.O. Ackley's book he shows that someone many moons ago "wildcatted"one. Here in VA. we can't shoot anything smaller than 23 cal. which effectively says it's 24 cal. or larger. Unless, of course, you have that 23 cal.
The 6 TCU sounds good. I've even thought of the 6 AR Turbo.