Thread: Is "case sizing" a requirement when reloading 12 gauge hulls ?

I reload some 12 gauge from time to time mostly for black powder. I use to use winchester aa cases and when they ran out started to use the short base empties from target products trap loads.
Resizing has never been an issue and probably isn't needed except for a semi. Try a fired shell in the gun you want to reload them for if it fits easily and extracts no problem just run the resizing bie far enough to deprime and uniform the petals.