Typhoon F12 cycling problems

What kind of light loads? I would think you would need at least 3 dram equivalent loads of around 1 1/8 ounce of shot. Also check the empties around the rim. Some of the cheap birdshot shells will bulge out where the extractor sits when fired and cause all sorts of malfunctions.

You might want to try using shells with a bit more oomph, as lighter loads sometimes don’t generate enough pressure to cycle properly in some shotguns. It’s also worth checking out forums or even contacting the manufacturer for specific advice on the Typhoon F12. While you're sorting this out, don't forget to look into insuring your gear with something like sundaysinsurance.co.uk —it’s good to have coverage in case anything goes wrong, especially with all the tweaking and testing you're doing.