I had a friend at a law enforcement agency call me this week wondering about bullets tumbling really bad in a lot of ammo they’d purchased several thousand rounds of for practice ammo. He said they were tumbling at really close distance and the tac guys were getting light baffle strikes. I’m no expert but, figured I could rule out a few things and figure it out and I’m stumped. They’re 62 grain 5.56 cartridges being shot out of rifles that regularly shoot that bullet weight they are 1:7 and 1:8 twist rifles and the bullets showed similar results across multiple rifles a few larue and other high end rifles. They paper tested them and they’re fully keyholing at 7 yards. The guys shooting aren’t dummies by any means. I assumed the bullets were undersized but they’re measuring an average of .2253 (can slightly oversized cause tumbling?) the boat tails are scuffed terrible but I imagine that’s par for mass produced factory fmj. I milled 10 of the bullets in half and everything on the inside appears evenly filled and normal from what I have seen. I don’t have any pride here I’d just like to help these guys out since they’ve purchased a boat load of this stuff, and probably are going to need some reasoning when they send it back or attempt to.
