My dad passed away a couple of years ago and had this rifle that he always referred to as an "elephant gun", but I can't figure out the make or caliber of the gun. I don't see any markings on the barrel or anywhere else other than MAG-26266 right under the scope mount. I was told that MAG is the manufacturer's code for Hijos de Jorge Bascaran Mfr. of Marke and Martigry, but I don't see much info about them online. My dad acquired the rifle in the 70s in trade for some dental work. Any help would be appreciated.