Reloading data help for pre-war German Mauser
Posted: Wed Dec 13, 2023 2:47 pm
Hello! I recently came into possession of an old German pre-WWII German Mauser from my grandfathers estate.
I have cast the chamber with Cerosafe and slugged the barrel, but plan on getting it to a competent Gunsmith to verify my findings. That being said, What I appear to have is a pre-war 8mm Mauser with a "proofing date" of May 1928. The bore of the barrel is .311" and the rifling is .318', however comparing the chamber casting to the cartridge data that I have available to me, it appears that the chamber has been reamed out to properly feed the newer 8mm Mauser cartridges which of course utilize a .323" projectile. It is my understanding that U.S. manufacturers were at some point in time, making an under powered 8mm Mauser round that was pushing a .320" projectile so that it could "safely" be fired through either a .318" or .323" Mauser barrel. This seems a little suspect to me, and may be why these rounds are no longer available! My issue at the moment is that the only reloading data that I can find is for the 8mm Mauser pushing the .312" projectile and they are extremely insistent that this data should NOT be applied to the 8mm with the .318" barrel!
I am kind of hoping that maybe there may be reloading data available on the other side of the pond for the original 8mm Mauser with the .318" barrel.
I have cast the chamber with Cerosafe and slugged the barrel, but plan on getting it to a competent Gunsmith to verify my findings. That being said, What I appear to have is a pre-war 8mm Mauser with a "proofing date" of May 1928. The bore of the barrel is .311" and the rifling is .318', however comparing the chamber casting to the cartridge data that I have available to me, it appears that the chamber has been reamed out to properly feed the newer 8mm Mauser cartridges which of course utilize a .323" projectile. It is my understanding that U.S. manufacturers were at some point in time, making an under powered 8mm Mauser round that was pushing a .320" projectile so that it could "safely" be fired through either a .318" or .323" Mauser barrel. This seems a little suspect to me, and may be why these rounds are no longer available! My issue at the moment is that the only reloading data that I can find is for the 8mm Mauser pushing the .312" projectile and they are extremely insistent that this data should NOT be applied to the 8mm with the .318" barrel!
I am kind of hoping that maybe there may be reloading data available on the other side of the pond for the original 8mm Mauser with the .318" barrel.