Reforming 284 brass is the way to go if you cannot get decent 7.5 brass. That is all I use I have 20 cases of the 7.5 the rest are the 284 and they shoot and eject fine. Some claim the cases are better for the 284 than the 7.5 too. Not sure about that but I do know they work fine. Go to the Swiss site and they will explain on sizing the 284 cases once you get your dies and press set up right it is a snap.