If it actually expands, I'm surprised as its supposed to yaw. That may result in fracture, I guess. Military lawyers gave It the thumbs up because it's not designed for expansion.
It is made for accuracy and is very stable until contact, that's when the Tumble does its damage.

Zee, be cautious if using actual Gov. 262 mod. 0. It was replaced by mod.1 in 2003. We had a bunch of mod. 0 and experienced reliability issues.