This is all so helpful! Much appreciated. I sent the gun to Keith Kearcher for a proper cleaning and going over. Looking forward to seeing his work. He may even make the custom rifle cartridges for me.

Also, I ordered a 1930 catalogue that Krieghoff happened to have. Since mine was proofed in 1931, there's a chance this model is in the catalogue. If so, I'll scan the page and include it in a follow up post.

Thanks again!