I think the .25 would have potential if it didnt come chambered in so many old guns. I know what NAA tried but I wasnt impressed.
I think a new .25 caliber straight walled cartridge with a 50 grain JHP at 1000 FPS would be a nice pocket gun. It would be around .32-380 ballistics if done right and would hold more rounds and be lighter and smaller.
I have been hand loading for .32 and now .380...I'd like to try .25 as well and I'm researching pistols. My point is that I am able to load some pretty impressive (relatively) handloads for .32 and .380 and suspect it will be the same for .25.
In a locked breech gun like the Glock 42, I am able to safely load hand loads that, quite frankly, frighten PPK pistol shooters. The Glock handles hot (not unsafe - just potent) hand loads with no signs of pressure or impending doom, mild recoil, and tremendous accuracy in loads that would have a blow back operated pistol and it's owner setting the gun down, shaking his head, and walking away. I can get 200 fpe out of a .32 acp in a blow back pistol like the Colt 1903...that's a 75 gr. pill running almost 1100 fps. I know it's still a mouse gun *but* I have little doubt about it's ability to function as an SD round.
Out of a locked breech gun? Boy would I love a locked breech .32 pocket gun...a modern gun with a long enough barrel and a locked breech to examine the potential that exists with these small calibers. I think (I strongly feel) that .25, .32, and .380 in a modern locked breech gun, might yield results in small pocket sized guns that would impress. The potential is there in these cartridges and calibers but we'll never see guns chambered to take advantage of that due to prevailing knowledge that they can never be effective as SD guns.
I think we have closed the door on something with the calibers before we have fully exploited the potential - I think a 3.5" barreled, locked breech, polymer pistols with a low bore axis in *hot* .25 could safely be shoving 50 gr. flat nosed bullets at 1200+ fps in a truly pocket sized pistol.
The performance I'm getting out of .32 and now .380 suggests we have not really exploited these calibers potential. IMO.
VooDoo