I do not shoot any reloads through my machineguns. It is simply not worth it. Even if you haven't made a mistake in 20 years, doesn't mean you can't now. If you destroy the registered part of your Machinegun (frame, registered sear, DIAS or other registered conversion), it is history. ATF will not let you replace it.
NRA Certified Instructor: Pistol, Rifle, Shotgun, Home Safety, Personal Protection, Range Safety Officer
NRA Life Member