mtnlvr wrote:What about shimming the barrel extension to increase chamber length or machining the barrel's shoulder shorter to decrease chamber length to make it headspace with the various bolt heads?
I have an MG3 bolt on the way, maybe this bolt head will work on all or the some barrels?
I really do not want to mess with an NOS barrel. For headspace that is too tight, I suppose that one could use a chamber reamer and take a thousands off the shoulder and neck until it headspaces. That is something that I would have my Gumsmith do, if it came to that. I think that the chamber is chrome lined, so this could compromise that. I have heard that unscrewing the barrel extension a bit and shimming may also work. I would be concerned if it left too much of the base of the case unsupported. I suppose another option is to just swap the barrel extension with one that is a bit more worn and see if you get lucky and it wil headspace.
In the mean time, comparatively speaking, bolts are relatively cheap and available. So, I will just keep trying. If I end up with spare bolts, that is not a bad thing. They can always be traded if they fit someone elses barrel.