The name is Mauser. These were captured German K98s that were run thru the arsenal, refurbed, overstamped, placed in war stock storage. An imported rifle (imported into the US) must be stamped with the caliber. ORIGINALLY 8mm Mauser caliber, MAY now be 7.62 NATO (close to, but not same as .308 Winchester) but READ what is marked on the rifle. If not marked, get a smith to check it, do a chamber casting if needed.
What we have here is... failure- to communicate.