m16 barrel

[derek45]

It's stable in flight, but begins to pitch & yaw when it hits something denser than air.



.
.
.
Russian 5.45x39 AK-74 round

 

[N555]

Um… sure seems like you did…

2 different problems, caused by the same thing.

 

[d2wing]

Vietnam vet here, never saw that at any range qualifying.