I ran into this too. I think it was due to the length of the brass on the shell. I notice that some are fairly short. Wish I had taken better notice of what shells they were from Federal, as all I ever see on the Benelli shows is how great Federal is - yet my one experience with a box of 25 rounds sucked royal. So much so that I haven't bought any since.
Originally posted by [stray]:
The first problem I had was with some Federal shells that would not seat when pumping into the chamber. I remedied this by using a different brand of shells but it seemed a bit strange.
My problem was slightly different than yours. After firing a shell I could pump the gun, eject it, chamber another round, fire it, and that round would be stuck. Literally. I had to take the barrel off to get the shell out each time. It was do this to at least every other shell, and sometimes one right after another.
Switched to Remington and haven't had a problem since.
As for your other problem, sorry, no clue here. I'm sure some of the other guys will chime in shortly with some good advice though.
Best of luck.
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