Started a new batch (1,000) of 9mm and have been scanning the cases during my first step which is a .308 reloading tray looking for .380, Makarov, split cases and now interior belted cases. Found one FM. They're actually hard to catch because the belt is only 0.5mm thick. The picture is deceiving. Have resorted to a more careful inspection of each case as I resize it. NOTE: These are probably no problem at all with semi-autos. In SAs you have a tight headspace, but in revolvers with their loose headspace is when issues will occurs as it did with me. Don't know Ammoload, FM, et. al. do this with other calibers. I'm guessing someone thought this would be good for major power factor, especially with incompletely supported heads.