I've found with my Perazzi, 12 ga Challenger ammo occasionally have the same problem. I've measured the ammo when this occurs & some of the shells measured .020 less diameter. Also, the base metal height is shorter than most other ammo & this failure occurs when you drop in a shell & the extractor is full in the out (ejected) position. The undersized shell slides in behind the ejector. Also, the Perazzi ejector throw is a little longer than other guns. Krieghoff's have a shorter throw & never had this problem with my Krieghoff.
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