Try Ancestry.com's international collection, they've been voraciously vacuuming up records that are available, including rolls of Prussian & German soldiers in 1870-71, etc. You might have some luck there, more than you think, especially if you have some more info on him, like unit or town!
Neat MG08! The conversion in Germany is interesting, that was not what I expected! Iv'e got one I take out to the WWI events out here in Kansas, I'll try to post a pic of it the last time I took it out! Haven't seen many Semi 08s!