Dons,
Hi, thanks for redirecting here (Im MartinGodio on AR).
Beatyfull rifle.
The only Spanish 93 I have in my hads was 7,65x53mm so my bet:
It is for the .303 Mauser/7,65 Fraser.
Just guessing, Fraser bought a barreled action, probably at low price after Spain change his ordennace fron 7,65 to 7x57mm.

Enjoy it, BTW Hornady make a very goos ammo fro the 7,65.

Martin

PS: If it is a 7,65x53mm you may be interested in this thread:
http://forums.nitroexpress.com/showflat....true#Post101816