The new .327 Federal Magnum pushes a little over 400 ft lbs which is pretty close to the Russian Tokarev 7.62x25 round that has been around since the Tok in the 1930s. It's pretty hot, but I don't know of a firearm that shoots it other than the Tok. It has to be chambered in locked breach/delay blowback designs, quite high pressure. Tokes are cheap, though, and flat and rather light, easy to conceal. But, there's no safety, which sorta sux. LOL I had a couple of Chinese 9mm Tokes in the past with a safety installed that worked backwards of the way it should. There was no real safe way to carry the thing other than condition three, not real practical.
Technically, the 7.62x25 is a "30 caliber" as the bullet diameter is .308", but a .32 is actually .311", and with only .003" difference, you can shoot .308 bullets in a .32 and have a half way accurate gun, they're that close. In fact, I've done just that in 7.62x39 (.311" bore) with good accuracy results. The 7.62x39 dies came with a choice of .308 or .311 expander ball to allow you to use either bullet diameter.