Stranger things have happened, Hawkman. Your bullet merely got dropped backwards through a final forming stage.
I've found a mix of 115 & 124s in factory 9mms before. I don't weigh all my bullets, but I sure do take a look at 'em when loading up. Not a bad idea when setting up & making sure the scale's all set, to throw a couple bullets on just to see what it is you got.
Far as strangest - bought a NIB S&W .22LR revolver - key-holes badly at 15 yds. Take it home, clean it up - doing failure analysis stuff in my head all the way home - turns out they "forgot" to rifle the barrel ....
