They will not seat below flush with any brass I use commercial or military.Federals and Winchesters do seat below flush.The Winchester primers are a bit shorter than the CCI,but the Federals are not.If I uniform the pocket they will seat flush.I can't see uniforming all the pockets.I run them through a Dillon 550.I am afraid of slam fires.Has anyone had this problem with CCI`s besides me?Thanks ahead ,Huntz