I agree Paul, with no rifling in the waist, safe to say it left the case this way. I don't believe it tumbled anyway as it went through 20-plus inches of gel and stopped on an armor panel.
One opinion was that it was made this way-- I don't believe it. I'd have seen it upon loading, or felt it with my fingertips, or felt an odd variance in effort as I seated it. The top of the waist corresponds perfectly with the bottom of the case neck.
Anyway, knowing how these are made, would you not agree that it's very unlikely to have been made this way?
And.... as to recreating this..... I don't think I want to.....