I picked up a small ring Spanish Mauser at the Loveland Tanner show. It has been sporterized and drilled for a scope. The barrel is in fair condition, I want something different than 7X57. Just wondering what calibers in the realm of .243 and .260 would be safe to convert it to? Any other caliber choices would be considered.

Also, how does one tell when it was made. The only numbers on it are 5414 on the left side of the receiver, floor plate, and barrel. It is currently getting the safety fixed so I'll post pictures when I get it back.