A close friend and very good gunsmith passed away and left me some of his stuff. Amongst the barrels was a barrel I thought might be a 7X61 S&H as he was a fan of this cartridge. I recently examined it and find it's not, but cannot figure out what it is. It's belted with the dimensions of the 7x61, but it's only 2.155" long with a long shoulder like a 300 H&H. I thought it might be a short chambered barrel for some other caliber, but I came across his dies for this cartridge. The barrel and dies are not marked. The dies have very fine knurling and both the top and bottom of the dies are chrome plated. I can find no information an a cartridge with these dimensions. Any ideas?