Over the years, I've had some actual FTF 22LR duds, but they've usually fired when chambered again. Chalked it up to faulty spin priming.

The only other problem I've run into has been some lots of Federal AutoMatch "bloopers", where the report was very different when fired and, in some cases, you could actually see sparks out of the barrel when fired. Happened about 3% of the rounds. I thought this was due to light powder charges, but the engineer I spoke to at Federal said they see this happen when their crimping operation gets off-spec. Apparently 22LR ammo needs a heavy, consistent crimp in order to get good ignition.

They sent me a check for all the bricks I had purchased and sent UPS around to pick up what I had left. I've since switched to using CCI SV and haven't had a problem since then.