There's a lot of information to be found regarding Model 1893 Spanish Mausers. Some are great rifles and others are ... questionable. In general, those made in Germany are better than the 'Oviedo,' or Spanish made ones. While I've yet to find a verifiable report of catastrophic failure of a Spanish receiver, there is one eye-witness story about a barrel literally being shot out of the receiver, flying off and injuring a fellow shooter.
The problem seems to be with the heat-treatment of the receiver. In the case above, the front ring expanded enough to allow the barrel to come loose. In most cases though, shooting higher-powered ammo only causes the bolt lugs to indent themselves into the recesses of the receiver. The first sign this is happening is a repeated difficulty in raising the bolt handle. If it isn't addressed, the bolt will continue to work its way back, exposing even more of the cartridge base until one cartridge separates and explosive gasses travel back along the left side of the bolt and into the shooter's face.
Unfortunately, there seems to be no way to know ahead of time which rifle is safe and which is not. The simplest precaustion is to use low-powered ammo and make frequent checks of the headspace. I have a Turk '93 in 8mm that I know was made in Germany. I still check headspace once or twice a year just to be sure. My wife has a Spanish Mauser in 7X57 that was also made in Germany. Since the 7mm is a lower pressure round, I don't worry so much about the headspace.
The bad thing about shooting surplus rifles is the uncertainty regarding their safety. When you consider that - by pulling the trigger - you're setting off a pipe-bomb five inches from your nose, you might want to take as many precautions as you can.
. Does anyone have any ideas on how or what I can do to it. Web searches end up with nothing. Specs and range would be nice
