The US Military procured some ten million rounds of full metal jacketed bullet ammunition from Remington.
The cartridges look like .22 magnum FMJ ammunition only shorter.
I was made to comply with requirements for the use of full metal jacketed bullets in combat and survival weapons.
Since most .22 ammunition used in combat is during survival escape and evasion and clandestine operations I always thought the fmj stuff was sort of goofy but then again having real full metal jacketed bullets and not just copper plated solids loaded in your AR-7 survival rifle just might keep the guys who capture you from executing you on the spot for possessing non military application ammunition, who knows,,,,