[Spinner]

I recently purchased what i believe is the same rifle, im having some difficulties figuring out what caliber it is. I was told it was a .308 but after reading different articles, it could be a number of diff. calibers... I dont really want it to blow up in my face. The date is a 1943 with a 4-digit serial number, I've read that in the '50s the calibers were converted. Please help with any suggestions.

P.S.
The rifle very closely resembles the one that started the thread, but with the original stock and hand guard.

[AleksiR]

Take it to qualified smith and ask him to do a chamber cast, after that he'll be able to tell you what caliber it is.

[c3shooter]

Spinner- what you have been told is (bluntly) immaterial. Unless the rifle has been stamped with the caliber, the only CERTAIN way to determine it's caliber is to have a gunsmith make a chamber casting. A special material called Cerrosafe is melted, poured into the chamber, let cool, pop out the casting, measure it with a micrometer, compare measurements to known cartridges.

[robocop10mm]

Looks like a 1936 Spanish short rifle. I have two. Small ring Mauser action. 7 x 57 Mauser caliber.