The PMP ammo is labeled 3.56 g (55 gr) .223 Remington.
Two of the rounds that didn't fire, when laid out with the others, had the bullet pushed back in the case, all that was showing was the tapered part.
I don't know where my buddy bought this stuff. I have about 120 rounds. Would I dare shoot it in another gun?
This gun is so screwed up I don't even think I could rebuild any part of it and feel comfortable it would be safe. Ever casing has a dent in the side .75" back from the front after firing the reloads. The primer impact has a raged ring around the firing pin strike point. I think I'm going to cut it in half and sell it as misc parts.