Never used one. Here are 2. R W Hart Case Saver Swage for Small Primer Pockets
http://www.midwayusa.com/product/339...primer-pockets and another CASE SAVER PRIMER POCKET SWAGE - SMALL PUNCH ONLY
http://www.mwgco.com/ar-15_accessori...S-SMP-000.html There are 2 common diameters of flash holes, some 223 brass has the smaller. Dont know if this could be a problem??