The 8.8 indicates a 9.3 bullet in the 8.8 rifling
As KY Jon says a chamber cast is a great idea

The fact that unfired 2 3/4 ammo fits the chamber is no
indication of proper chamber length, measure!

I am pleased you discovered it was indeed a 12 gauge smile

Study here
http://www.shotguns.se/html/germany_1890-1945.html

Nitro proofed both rifle and shotgun smile

Fun thread, thanks for sharing

Mike

Last edited by skeettx; 12/23/13 10:02 PM.