I have heard of slam fires from some commercial ammo. In theory, I guess, it could lead to a sequence of slam fires but I have no idea how probable that is.
After reading this, I did a quick online search to try and remember what I have heard before. Fulton Armory has a page attributing it to loading a single cartridge without using a magazine (
LINK).
I can't seem to find a report from someone that actually experienced or witnessed it. I'd chalk this up to internet lore.
I have stocked up in M2 ammo from the CMP but now it looks like their lead times are ridiculous....Keep an eye on this Prvi Partisan (
LINK ) from AIM Surplus. They are out now but get it from time to time.
Federal also makes a round designed for the Garand as well (
LINK).