Ah, interesting stuff.
But kind of an irrelevant historical anomaly. Soldiers don't need hollowpoint bullets, because they use high-powered rifles which impart sufficient velocity to ammunition to cause it to fragment/mushroom on impact without any need for hollow-point designs. I.e., the guns/ammo soldiers use are actually much nastier, but don't run afoul of the Hague convention due to technicalities.
Hollowpoints are only relevant to lower-velocity guns like handguns and the like. Some kind of interesting quirks in the UK laws listed on the wikipedia page on hollowpoint bullets, though: apparently it's illegal to hunt certain types of game with anything other than hollowpoint rounds (I guess to make sure the animals die quickly after being shot).
Also I still don't think the Hague convention, Geneva Conventions, etc. have any particular applicability to domestic policing. They're only in force for armed conflict between states, or similar situations.