HalfaDouble,
It is possible, I guess, that the Germans went back to their WW1 process of making the chamber neck large enough to release the larger bullet. Mauser Oberndorf rifles made between the wars were often chambered this way, which allowed use of 8x60 and 8x60S ammo ( .005" oversize).Oversize bullets entering a barrel become groove diameter by the time they have traveled their own length in the barrel, What drives the pressure up is the case neck jamming into the chamber and not releasing the bullet until the pressure builds up. This can be caused by an oversize bullet in a tight chamber, or by an overlength neck jamming into the leade. I would be interested also if you could slug an original 8x50R barrel, it is possible they were .329" groove.
Mike
See Jani's comment above, I guess that answers the diameter question.
Mike
Last edited by Der Ami; 01/04/19 12:02 PM.
