It's an FN action made in Belgium, it should be a Mauser action. Now the question is, commercial or military action? I'm betting military just based off the description. More than likely if military it's 8x57 or commonly Caledonia 8 mm Mauser.
However, if there isn't a chamber stamped on the barrel take it to a gunsmith and ask him to do a chamber cast to be safe. That way you know for sure what it is, and if it should be safe to shoot.
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