Before shooting it, take it to a gunsmith and have the headspace checked. Sometimes, NOT always, Mausers have numbers on the bolt, receiver and barrel, if they match, it's PROBABLY safe to shoot. If they DO NOT MATCH, it's especially important to have the headspace checked. It might be perfectly fine, but if the headspace is "off", it's probably unsafe to shoot.
After WWII, the rifles were dumped into piles, rifles over here, bolts over there, etc. When they were brought over here, it may, or may NOT, have the original bolt put with it, which can possibly cause headspace problems.
This goes with any older military rifle, and any older rifles in general. It doesn't cost much, if the smith has the correct gages, and can be done while you wait.
Without more info on the individual rifle, it's hard as heck to give any more information, and with Mausers being made in the millions over the last 110 years, there's not much more help I can offer, without more information. There were LOTS of contractors making them, for several countries, in several countries, and possibly with different specs.