I picked up a started project gun at the last show for $20. It's a Venezuelan large ring Mauser that has a really nice barrel chambered for .223 Rem ( I cast it with Cerrosafe). The reciever has been shortened but there was no bolt, it has a semi inletted stock from a nice looking walnut blank (block). I picked up an extra bolt and have read my Kuhnhausen book cover to cover several times. The receiver shows just the slightest bit of evidence that it was welded, the magazine and trigger guard matches length. So i need to shorten the bolt, heat sink and Heat Stop Paste are on the way and I plan to silver solder the bolt back together but gas and arc welding are available in my garage also. My main question is the bolt face, what should I do for the small head on a .223 case? The extractor looks like it will hold in the groove but how to shrink the bolt face to support the case head? I don't like the idea of welding and opening it up for fear of annealing the locking lugs. A friend suggested boring the face and pressing in a bushing, drill rod material. Has anyone done this before? If so what did you do for the bolt face? Can I just leave it big and have the case head unsupported? Any ideas from anyone would be a huge help! Thanks in advance!