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Message: <blockquote data-quote="mr ed" data-source="post: 1697174" data-attributes="member: 6777">Only commercial guns are marked on the barrel.  Most military surplus guns are not. If someone hands you an old mauser what cartridge does it use???  7x57,8x57 7.62,7.63,7.65.7.5 or a dozen others  Just cause its a mauser don't make it an 8mm. Mauser made their guns for dozens of countries in dozens of cartridges and 98% of them are not marked. Then these guns have been modified over the years by various countries and hobby gunmith/shooters. The only way to know for sure is to do a chamber-cast and slug the bore.Some surplus guns can vary greatly due to who/how/where they were made.as much as .003 variance from gun to gun is often seen on guns like ak's, sks ,smle's.  Thats why one guy tells you his surplus gun shoots so good and the next guy says his won't hit the side of a barn.</blockquote>