Rebuilt a K98, should be safe to fire?

might want to research breach design pressure and the design pressures of the new and old shells.

Official answer: take it to a gunsmith and have it checked out before firing.

Unofficial answer: choot it.

What I’d do: choot it with normal pressure Euro rounds like S&B.

This may be dumb however, after inspecting and cleaning an old K98, I chambered a round, held it of to the side under the shooting bench at the range and pulled the trigger. All went well. Whew!

Odds are if its a matching numbers rifle its good to go. I would want to check one that has a replaced barrel or appears to have been Bubba gunsmithed

There's a gunsmith at the range I belong to, I'll ask him to check the headspace.

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What round is it chambered in?? Both the 7mm Mauser and 8mm Mauser are potent hunting rounds.Has the safety alraeady be changed to a horizontal type?

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8mm, it's a K98 dated 1943, with matching numbers on receiver, barrel, bolt, and trigger guard.

It is the barrel, receiver, trigger and guard, and the bolt.

I purchased a stock;
magazine follower, spring and floorplate;
various hardware (butt plate, bands etc) to complete the stock.

No import markings on the barrel or receiver. It came out of the closet of a 75 yr old woman who said her father brought it back from the war. I've known her over 30 yrs, have no reason to doubt either her tale, or her ability to protect and maintain it.

She got flooded in Central back in 2016, - but like I said I know her. She soaked this down in a tub of diesel afterwards. I know she saved a ton of tools and some other (complete) firearms in the same manner.

I mentioned rust, it was all surface and minimal. When I rubbed it down with ballistol, the metal came out cleaner then a lot of guns I see for sale used. The barrel rifling is very sharp, and mostly white. Some indication of shooting corrosive, but overall not much.
A good indication of the condition- I ordered parts from Numrich, used stuff. They came with less finish, and often more rust, than the stuff I started with.

The bolt, firing pin, spring etc were pristine.

I'm about to go to the range. If I don't blow my hand off, I'll post a follow-up

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What I’d do: choot it with normal pressure Euro rounds like S&B.

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Mauser 98 actions are extremely robust. As long as headspacing is within specs, I wouldn't worry about what manufacturer makes the rounds, as long as they're not someone else's handloads.

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So nothing was marked at all, but someone long ago apparently bored it out and rechambered it, to 375 H&H

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WOW!! 375 H&H??? What a surprise. How many rounds did you shoot before you realized it was something more than 8mm??

Nevertheless, sounds like you got a good deal.

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So nothing was marked at all, but someone long ago apparently bored it out and rechambered it, to 375 H&H

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So… totally disregard my prior post.

That’s cool as hell.

I bought some Cerrosafe from Brownell's once to cast a chamber but never got around to using it.

It might be possible with the port opened up but you should be able to see this on the receiver ring