Took the Glock and the AR-15, left everything else at home, and grabbed ammo cans for each, targets, and the range bag.
Started out with the AR at 50 yards, and loaded a box of Winchester White Box 5.56 NATO into a new magazine I'd bought a while back but never used before. This was a cheap imitation of a PMAG that I'd picked up somewhere or another for, like, 7 or 8 dollars.
Loaded the magazine, chambered the first round, sent it along... Hrm, about 2 inches low at 50 yards. Sent two more, all three about the same spot. OK, dial up the scope a bit, 10 clicks then back down 2, send another. Ah, now that's better. let's commence to commencing.
OK, what's this? Light primer strike, I suppose. NBD, right, just a chance to practice malf technique.
Safety on, drop the magazine, pull the charging handle to clear out the...
What the hell?
The round looks like the bullet was forced back into the cartridge. Very odd.
Set it aside, put the magazine back in the gun, chamber a round...
OK, now this is getting to be annoying.
Safety on. Drop the mag. Pull the charging handle...
Two rounds from the same box of WWB did this.
I unloaded the rest of the rounds from the cheap-o magazine, put them into a proper Magpul PMAG, and they ran fine, as did a few other boxes.
Wondering what caused this.