What??????? Where the heck did you come up with that????
The original 7.92x57mm (8mm Mauser) was developed for the 1888 Commission rifle. It used a bullet of .318 diameter. This version of the cartridge used a 226 grain round nose bullet at a fairly low velocity.
In 1905 they updated the cartridge with a .323 diameter bullet and a spitzer type bullet.
It was again updated during the 1930s with a heavier 196-197 grain bullet.
The Germans, Czechs, Yugos, Spanish, Mexicans, Turks, and others used and sometimes made via license versions of the Model 98 type action.
M-98 type actions can be found in 7.92x57mm, 7x57mm, 7.65x53mm, 30-06, 7.62x51 Nato (rebarreled or chamber adapter)
All had step type military barrels which are faster and easier to produce.
You have not provided enough info to make a close guess.
Here is a Czech license version called a VZ-24. This particular rifle is in 7x57mm (7mm Mauser) and it was part of a contract order by Brazilian rebels in Sao Paulo Brazil. As a result it does not have many of the regular markings found on contract rifles. Oddly enough it was originally part of an order of 7.92x57mm Rifles being ordered by the Southern Chinese army. When the Chinese could not pay, they were re-barreled to 7x57mm and shipped off to the Rebels at a bargin price. Unfortunately the rebels lost before the shipment made it to Brazil and the rifles were seized by the corrupt government. This is a JC model which was considered a light weight version, since it weighed about 0.75 pounds less than a standard rifle.
