Originally Posted by
Potss
If you step up to a rifle-like platform, might as well go with a full rifle cartridge IMHO. 6.8SPC is a bit of a meme but actually does pretty darn well out of very short barrels like that, better than .300blk even (in terms of velocity and energy per round that is). The real advantage to things like the 9x25 with light bullets is you can full on CCW it like you would any other pistol.
I should also mention two things:
1.) DocGKR has mentioned that he doesn't think the Lehigh Xtreme Defender bullets perform as advertised on real flesh and blood targets. There are mountains of anecdotal evidence that shows the opposite, but nothing hard enough to say for sure, at least not publicly available. I for one think they probably work a lot better than FMJs, and maybe as well as JHPs, but I don't have the time/money to do a statistically significant study on it. So use at your own discretion.