FMJ yaw and upset performance

[stanc]

The challenge for us in this thread, however, is that the question posed by the OP refers to the UK interpretation. I know enough to realize that he is stuck with that more strict interpretation.

It's been awhile since I read that section of the 1899 Hague dealing with small arms ammo, but I think I'm remembering correctly that it bans bullets which "expand or flatten easily" in flesh.

It's written in plain English. No interpretation needed...unless you want to make it seem as if expanding bullets like TSX and SOST are somehow lawful and don't violate that prohibition.

You're working too hard at this, Joe. It's simple, really. What Tony requires is a bullet that does not expand or fragment, but still rates high in lethality/incapacitation. Terminal yaw seems to be the only mechanism available to meet the specified need. No fragmenting bullets, no "barrier blind" expanding bullets, just good ol' non-deforming FMJ (like the US used to use before the mid-1950s).