My guess as to the cause, and opening has been covered. I believe it was Mike who suggested a hung up hammer** in a soft primer. It was also suggested that you bump the bottom of the receiver across your knee, and that's just what I did. It was a repetitive problem with a particular brand cartridge. Since I happen to like that cartridge, I took the hammers out and dressed the firing pin to a more rounded profile, and have never had the issue since.
** for those not aware, the hammer and firing pin are one.
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