The still left cartridge's headstamp suggests "FC 223 REM" which means that it was made by Federal Cartridge Co. and it is actually while in the caliber .223 Remington. The cartridge on the right contains a Two digits are the last two digits from the calendar year of manufacture. The https://remingtonprimers91294940.blog-eye.com/20103161/fascination-about-cci-200-primers