Need some infor on a loaded round I have

[skeet]

From what I can figure this round is a 7.65x53 Argentine Mauser round loaded by Hirtenbergeer under contract in 1928...probaqbly for Argentina or another South American country. Diameter of the bullet is a bit on the small side but it may be a little larger inside the case neck. Thanks for the help..where I found the info was an off the wall chance.