The 7•57 in this case under the chamber would have been added with the rebore to 7mm, seems there was some confusion kuduae as it is today a 7x57. I suspect your are dead on in that it was a 6.5x54, rechambered to 6.5x57 in 1942 as you've pointed out by the reproofs. Then in North America much later rebored to 7mm and chambered to 7x57, as there is no reproof for that (hence my suspicion of North America, and there are other factors pointing to the customization being North American and it was found here). Today it is a 7x57 that requires very short seating of the bullets due to the short action mag length. Kuduae was very kind to bring this to the attention of Jon Speed and it seems he found it very interesting, not to mention Kuduae's own invaluable help and knowledge in figuring out what we have here. I thank you for the emails and assistance Kuduae.

While not cheap, I'm very pleased with this purchase, as it appears to be only the second large ring Kurz known, predating the only other known by one year. It is a pitty with the customizations, but overall a beautiful rifle I feel lucky to have.

Cheers and thanks for all the help!