Prices vary but don't buy anything over $300 because they are worth less than that. I would say they range from $150-300.
No- the 7x57 was developed separately, in 1892 by Paul Mauser. The 8mm Mauser (actually the 7.92 Mauser, but every calls it the 8mm) was developed by a government board.
Numerous commercial and custom makers have made 8mm Mauser rifles in the last 100 years
What about it?
No
The 8mm Mauser is a good black bear round. American 8mm is kind of underpowered but with handloading or European ammo its in the same class as 30-06..
Yes....
10000.00
$450
No, you cannot shoot .270 Winchester ammunition in an 8mm Mauser firearm. The .270 Winchester has a different case size and bullet diameter compared to the 8mm Mauser, which is designed for 8x57mm Mauser cartridges. Attempting to fire the wrong caliber can be dangerous and could damage the firearm or cause injury. Always use the correct ammunition specified for your firearm.
"No, 7.92 is German military caliber for WW 2 and earlier Mauser rifles." Actually, 7.92x57 is the same thing as the 8MM Mauser, if that's what the person was asking.
There are several rifles, both military and commercial, which have been made for this cartridge. Try to narrow down your criteria to something reasonable.
7.92x57mm, better known as 8mm Mauser. Same caliber as the German military's Mausers.