A good friend and big gun collector wanted me to go with him to shoot 2 pistol AR s that he bought at a gun show.
We set up a couple of targets and he started firing. I was picking up the brass, I noticed several were black with soot. I told him to stop while we checked the spent brass. The next 3 had splits and one had a started head separetion. He picked up the second pistol and chambered a round it failed to fire he had to hammer the bolt open. we went to my shop and I checked the head space and found them to be correct. But when I dropped a few rounds of unfired in a headspace checker they stuck up, some as much as 1/8 inch. The box of 500 rounds he bought at the gun show were marked "factory reloads 223 remington"
Not everyone at the gun show selling reloads are real reloaders.