[Kozak]

Well I guess in that case all weapons more advanced thean the bow or the bayonet are "Chemical" weapons because they depend on a chemical reaction to generate the gases that make the weapon fire.

[DK Zimmerman]

I may mis-recollect, but I thought WP was considered an incendiary as opposed to an explosive munition? (But definitely not a chemical weapon in the form applied here.) As such, I'm not entirely sure it doesn't have a reduced application, vis a vis .50 cal.

Reportedly, .50 cal rounds are not supposed to be legal as anti-personnel rounds. Only anti-materiel. Not entirely sure how the new sniper rifles or for that matter, even the Vietnam era use of M2s in single shot mode with Starlight scopes square with that.