Anyone have any idea what caliber this might be?

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i have the same 7mm mauser. the date on mine is 1906.

i shoot 140 gr pmc cartridges. will put a hole in a bull dozer blade.

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AH HA! So you are the culprit vandalizing the construction vehicles all around the community! I shall go collect my reward now and turn you in. :celebrate

But anyways, I'll just have to go find out what this rifle will shoot through .

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I have one of those Spanish Mausers that I bought maybe 20 years ago. Big 5 was selling them and they were the ones that had been rebarrelled to 7.62x51 NATO. I just went and looked at mine, and if you look on the left side of the receiver right by where the gas relief hole is, look for a faint 7.62 CAL stamping. That's what mine has. That should tell you if it's one of the ones that has been rebarreled to 7.62x51 NATO. If it is , do NOT fire .308 in it. The steel is not strong enough for .308 pressures.

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the safty on mine is kind of hard to set to on but the bote lock is smooth to set. both are easy to unlock. must be a burr on it. last box of shells cost 24.95.

i don't make it a habit to shoot bull dozers but this one tried to attack me.:lol:

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Rick,
There is no stamping on this one, so either it is an original, or the stamper got lazy.

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easy to test fit the 7.62x51(308) and 7x57mm. these wont fit in the wrong gun!