The remaining cartridge's headstamp says "FC 223 REM" which suggests that it had been produced by Federal Cartridge Co. and it really is during the caliber .223 Remington. The cartridge on the right includes a Two digits are the final two digits of your yr of manufacture. When reloading, generally https://remington-primers73963.blogozz.com/21808215/new-step-by-step-map-for-cci-41-small-rifle-primers