Thanks for the info, learned something new today
I'm debating between a Tokarev, CZ-82, or the 83 for my next pistol, it all comes down to ammo availability, and interchangability (that whole 38/357 concept).
Well, the 9x18 guns have a similar situation. They can fire .380 (which is 9x17) in a pinch, but it's not recommended for general use. Basically, if it was the only ammo available, yes, any 9x18 gun can chamber and fire .380 safely. You may get
slightly reduced accuracy because 9x18 is .362 versus .380's .357 diameter, but generally it's not enough to make a difference and many people reload 9x18 with the same bullets from .380.
As for ammo availability, well, it's a tossup:
When it comes to 7.62x25, ammo is fairly cheap and easy to come by, far more so than 7.63x25. You will hardly ever find any 7.63 Mauser ammo, as the guns themselves just are not that common and far less popular than the various Tokarevs and CZ-52. New-production 7.63 ammo is out there, just uncommon, whereas Wolf, S&B, PRVI Partizan, and various other companies make 7.62x25. The Tokarev also has the advantage that it can be easily converted to 9mm Luger. A simple barrel and bushing swap is all that is required. The existing 7.62x25 magazines usually work just fine with 9mm, although dedicated 9mm magazines are also available. The Tokarev disassembles exactly like a 1911, and the barrel swap can be done in under 5 minutes.
For 9x18, you have Silver Bear, S&B, Hornady, and quite a few others. However, despite there being only 4 different 9x18 pistols on the US market (Makarov, CZ-82, P-64, PA-63), Hornady failed to function test their ammo across a variety of platforms. At least one of their 9x18 offerings will not function in the Polish P-64. An actual Makarov will eat anything, but its siblings are sometimes slightly more tempermental. And, of course, for .380 you have the usual manufacturers. Their offerings may similarly cause feeding issues if you're not using an actual Makarov, though.
I own guns in both calibers. I have a Romanian Tokarev which I've tricked out with a Chinese chrome-lined 7.62x25 barrel and that compensator I linked earlier. I also have the parts necessary to convert it to 9mm. It shoots like a good 1911. I also own a Bulgarian Makarov, Polish P-64, and a Hungarian PA-63. The Makarov-caliber guns make good concealed-carry guns or "fun" guns, and are definitely better than any commercial .380. They're all highly accurate and absolutely reliable with proper ammunition. For self-defense, though, it's hard to argue with the Tokarev round and a good hollowpoint. Wolf makes some nasty hollowpoints, but even better can be had either by reloading or through a few special-order companies. These can cause damage greatly exceeding even 9mm or .45 ACP, if ballistics gel tests are anything to go by.