6.5mm Arisaka was my thought. That has a 50.3mm case length, semi rimmed, and the 3 primer stakes.
The 6.5 Carcano is rimless.
Type: Posts; User: Allizdog
6.5mm Arisaka was my thought. That has a 50.3mm case length, semi rimmed, and the 3 primer stakes.
The 6.5 Carcano is rimless.
I found the same answer with 311. Here's a link I found my answers from that you might find helpful with other cartridges.
https://www.cartridgecollectors.org/headstampcodes
Yes, the best I could find was "unknown factory peoples republic of China."