My grandfather was involved in field testing the Pedersen rifle in the late-1920's. Until you mentioned it, I had almost forgotten the stories about the conduct of those tests he told me when I was a child.
7mm Valkyrie is my most uncommon caliber. When the most recent barrel order comes in there is still less than 50 rifles in this caliber in existence.
I'm not sure what you are asking. I know the creator of this caliber pretty well. and he has said more than once that when the barrels that people have ordered directly through him and another online source there will be 49 barrels that have been made and sold.Possibly from the same chamber reamer?