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I've got a Spanish Army FR7 carbine which has an 1893 Mauser action married to a chamber/barrel that take a .308 dimensioned cartridge. A desire for safely indicates that a low-to-medium pressure loading is required but it isn't clear how low the maximum pressure needs to be
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An 1898 report of 1894/96 Mausers and their ammunition captured in cuba gave some interesting numbers
The report states that the Mauser Cartridges captured in Cuba had an initial velocity of 2200 fps with its 173 grain bullet.
I looked up in my 48th edition Lyman handbook for 7mm Mauser data. With a 175 grain Jacketed, loads that develop around 2169, 2165 fps with various powders, the pressures are 33 Kpsia, 32.5 Kpsia.
I have shot thousands of rounds of 308 Win, 200 yards standing and 200 yard sitting rapid fire, with a 168 Match and 39 grains IMR 4895. (AA2495 is a copy). The lower target was fired prone slow fire in a 100 yard reduced match. I believe this load or the same charge with a 150 grain bullet will not over stress a Spanish action, assuming it is metallurgically good.
If the receiver is soft, you will develop headspace and that could be dangerous.
