OP - looking at your pictures - the head-stamp says "223 Rem IVI" on what you show. At a local shooting place, I have been picking up fired IVI brass - presumably from RCMP that use the place (?) - is head-stamped "NATO plus-sign-in-circle", then "IVI", then two digits - is some here with "15", others with "16" - those primers appear to have purple sealant around a crimped in primer. I presume what we picked up is IVI made military NATO 5.56. Like others, I have a box of "Barnes VOR-TX" fired ammo here - all of the fired cases are head stamped "22-250 REM BARNES" - primers do not appear to have sealant, nor is there an apparent crimp - although I have not reloaded any to know that for certain.