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I have no idea what I'm seeing in that picture. It sure appears that the barrel has cobalt in the alloy, though.
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You are seeing a test barrel that had multiple rounds fired after a squib to see how the metal withstood the pressure.
My point was that "gatling gun" squib barrel looked the same because it was firing so fast it crammed the squibbed barrel full of additional rounds before anyone could react.
My search-fu is weak today though 'cause I can't find the article again <sigh>.