That the steel core of N76 is not intended as a penetrator, but instead slides as a weight/mass into the air pocket in the tip and destabilize it's mass distribution/SD to try and guarantee fish hooking/tumbling in flesh might get it off the hook if someone fights it hard enough legally.
The mild steel in the Chinese 7.62x39 from Norinco was also not intended to be armor piercing, or as a penetrator, but was instead simply filler that was cheaper than lead. However I don't think anyone was prepared to go to the mat over that type of thing back then.
