One of the most lamentable traditions among members of the firearms community is the tendency to latch on to a piece of misinformation and endlessly circulate it as authoritative. Nowhere is this more prevalent then on the subject of "dum-dum hollow point bullets" and their being "banned by the Geneva Convention."
It's not accurate, of course, but few, if any, ever make the effort to find out the true facts for the simple reason that the foregoing has so often been casually repeated by "gun persons," that, in keeping with "Goebbels' Big Lie" theory, it has taken on the aura of a verity.
For openers, "dum-dum bullets," named for their arsenal of origin in a town near Calcutta, India, are soft-nosed projectiles, not hollow points. And their deployment under the "Laws of War" is proscribed by a "Declaration on the Use of Bullets Which Expand or Flatten Easily in the Human Body" adopted at the First Hague Peace Conference of (29 July) 1899 which states:
The Undersigned, Plenipotentiaries of the Powers represented at the International Peace Conference at The Hague, duly authorized to that effect by their Governments,
Inspired by the sentiments which found expression in the Declaration of St. Petersburg of the 29th November (11th December), 1868,
Declare as follows:
"The Contracting Parties agree to abstain from the use of bullets which expand or flatten easily in the human body, such as bullets with a hard envelope which does not entirely cover the core, or is pierced with incisions."
The present Declaration is only binding for the Contracting Powers in the case of a war between two or more of them.
It shall cease to be binding from the time when, in a war between the Contracting Parties, one of the belligerents is joined by a non-Contracting Power."
Although not a party to this accord, as a matter of policy the United States has acknowledged and respected its applicability in conventional combat operations since its adoption more than one century ago.