I have 400 once fired cases of Fed 223 gold match brass...I loaded some as reg 223 & after firing & reloading ..noticed the primer pockets were loose..no real resistance in seating new primers...The reloads showed no pressure signs & were accurate..Anyway I'm working on a new caliber the Tac 20.. should I use this batch of brass to form up those cases ??? I have been trying to find Lapua brand formed up as Tac 20 but I cant find it...So buying a form die & having at it looks like the route I'm going to go.I welcome any suggestions/hints..mike in ct