I was hunting blue grouse in the foothills above Colorado Springs this afternoon. Saw a tube sticking out of the dirt and picked it up. Low and behold, it is a loaded 3" .410 shell, aluminum case, ink stamped "6" on the side. The round was roll crimped, the top wad was rotted away and seemed to have a 1/2 oz. or more lead 6's. It is primed with a primer similar to a regular shotgun primer except the cup is thinner. The headstamps are "WCC" and "57". My uneducated guess is someone pilfered it from a survival kit---we have the Air Force Academy, Peterson AFB and Ft. Carson around town for a possible source. Any direct knowlege?