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Actually I guess I'm stupid, it's still like 9 days until I've been running this thread for a year.
Here's an FN 1903 pistol, imagine the Colt 1903 pistol in .380 Auto, but scaled up for a slightly longer and more powerful cartridge, the 9x20mmSR Browning 'Long', it's a straight blowback gun, no locking system, which with the more powerful cartridge means a heavier slide, and a bit of an awkward recoil impulse.
The cartridge is a semi-rimmed one, and you can be looking at a 110gr bullet going about 1000fps, which is still dwarfed by relatively light loads of 9mm Luger, though I wouldn't call it weak. You can tell they wanted to get the most out of the cartridge, what with the long barrel on these pistols (which was probably partially motivated by the slide needing more mass, thus they chose to make it longer).
It's not that easy to find 9mm Browning Long these days, so apparently some of these are rechambered to .380 Auto, though I really wonder how reliably they work in that case, because that'll be an awfully heavy slide if you compare to the Colt 1903 in the same cartridge.