Most of the German Mauser rifles are stamped 7.9mm. This is same as USA 8mm. Since they were made by the millions by a variety of nations, Mausers are neither rare nor difficult to find on the market. Value starts at $100. and goes up based upon level & quality of customization.
You should have the rifle checked over by a competent smith before firing it.
NORMA makes full power 8mm ammo. American made ammo is much weaker; about same as 32 Special ammo. This weaker ammo is still deadly. I knew a Shepard in the late '60s who grazed sheep in the alpine pastures of Bighorn Mts of north central Wyoming. He shot many elk and a few bears, too with his German 8mm. He thought nothing of it. But of course he didn't read MAGNUM-focused magazine articles.
TR
You should have the rifle checked over by a competent smith before firing it.
NORMA makes full power 8mm ammo. American made ammo is much weaker; about same as 32 Special ammo. This weaker ammo is still deadly. I knew a Shepard in the late '60s who grazed sheep in the alpine pastures of Bighorn Mts of north central Wyoming. He shot many elk and a few bears, too with his German 8mm. He thought nothing of it. But of course he didn't read MAGNUM-focused magazine articles.
TR