No one that I've heard of. Now, a 7.65mm bullet is a different story. Numerous makers of ammunition and components for reloading are out there. Do an internet search.
maybe 100
50-500 depending on specifics
Are there no other markings anywhere on the pistol? Check out the link below for various European proof marks. Might be Belgian if the lion is above the PV.https://store.bluebookinc.com/Info/PDF/Firearm/Proofmarks.pdf
The caliber of the bullet is 7,62 mm. And shoots the 7.62x54r ammo. That makes it a .30 cal.
Barret stands for the company that makes the firearm. 50 cal stands for the caliber(or size) of the bullet. The diameter of the bullet is .50 inches or half an inch across.
The outside of the cartridge case is .38. The .357 bullet fits inside the cartridge case.
German or Italian. Most likely Italian
22 shorts can be used in any 22 cal. weapon. however, some 22 rifles require long or long rifle 22 bullets. AA: Normally you use 22 shorts in a 22 cal revolver. 22 shorts use pistol powder. It burns much faster than rifle powder. Thus, a 22 short bullet is going as fast as it is going to go after it has travelled about 4 inches. A 22 long or long rifle uses rifle powder. The powder burns slower. It has finished burning when the bullet is about 20 inches down the barrel. A 22 long rifle bullet has very little force when shot from a pistol. The powder is still burning long after the bullet slowly left the barrel. So use pistol ammunition for a pistol and rifle ammunition for a rifle.
Impossible to identify without a detailed description of all markings.
Try e-gunparts.com
Quite a few.
What about it?