[Edit] 
Correct Ammunition for a K-31 Karabiner
- According to a well-known published reference source, the 7.5 x 55 is the ONLY ammunition to be used in the K-31.
A FAQ Farmer Says
My brother and I also each recently purchased a K-31. We also purchased some ammo for them at the same time. This ammo is represented as being Swiss match ammunition and is packaged in 10-round boxes within 60-round bricks. These boxes are marked in German, French and Italian? "7,5mm Gewehrpatrone 11 (7,5mm GP11)". While there is no mention of the case length i.e. 55. I actually measured a cartridge to confirm that they were indeed the 7.5 x 55 Schmidt-Rubin cartridges that were already familiar to me.
First answer by Les Wright. Last edit by KEN. Question popularity: 178 [recommend question]
