I have an issue with my 1022 shooting the federal bulk saver pack. i finally think i nailed the issue. i had just replaced the trigger group when i ran into problems with FTE. The casing would spin a 180 and jam on top of the following round. all of these shots were also low-fliers which leads me to believe that they are not as fully charged as the majority of the rounds.
last weekend i discovered that the factory mags differ. i have four total, one labeled #1 another #2 and two that are #3. The 1 & 2 mags were causing the FTE. there is a ridge along the metal portion of the mag that is not srtaight when compaired to the #3 mags. once I switched to the #3 labeled mags the fliers didn't jam.
Once I get caught up i'll post pics. hope this may help someone else out there