Is it possible that the powder next to the primer was somehow contaminated by moisture or chemicals to cause a slow burn until the "fire" hit good powder?
It sounds like you had only the one cartridge hang fire? Did you test fire any other rounds after the hang fire?
Just curious, as I once had a situation with a misfire - primer dented, but didn't go off the first round, while subsequent rounds did. This occurred twice after a period of several days or longer storage. In that case it was a combination of weak spring and gummy gunk on a rather rough striker shaft. I initially and wrongly blamed moisture in the bolt in cold weather, and/or faulty ammo.
Polished the shaft smooth and fixed the other two, and all is good!
Last edited by las; 11/23/15.
