So my brother inlaw drops off two guns for me too check over & clean for him, The first is a mod98 mauser been in his family for 50+yrs never been fired. He didnt even know what it was, So I know nothing about mausers, I took it all apart to clean dirt etc, all the numbers match it has natzi symbols stamped on it, I found out it was built in 1944 my question are all of these 8mm?? There is nothing marked to tell the caliber. Thanks for any info.