Hollow point bullets are banned in war because they expand inside the body, creating larger wounds than necessary to take a soldier out of a fight. The prohibition dates back to 1899 and rests on a straightforward principle: international law requires that weapons used in war not cause suffering beyond what’s needed to achieve a military goal. A bullet that mushrooms on impact crosses that line.
The 1899 Hague Declaration
The specific ban comes from Declaration III of the 1899 Hague Peace Conference, which prohibited “the use of bullets which expand or flatten easily in the human body, such as bullets with a hard envelope, of which the envelope does not entirely cover the core, or is pierced with incisions.” That last phrase is a direct description of hollow point and soft-nose designs. The delegates were responding to a real weapon already in use: the British “dum-dum” bullet, named after the arsenal near Kolkata where it was manufactured for colonial warfare. These rounds had their metal jacket partially cut away so the soft lead core would mushroom on impact.
The declaration didn’t emerge in a vacuum. It was part of a broader effort to put limits on warfare that also banned chemical weapons and the dropping of explosives from balloons. The expanding bullet ban, though, proved to be one of the most durable rules to come out of that conference.
The “Unnecessary Suffering” Principle
The legal logic behind the ban is a concept called “unnecessary suffering” or “superfluous injury.” International humanitarian law tries to balance two competing interests: military necessity (you need to be able to incapacitate enemy combatants) and humanity (you shouldn’t inflict more damage than that goal requires). A standard full metal jacket round can wound or kill a soldier effectively. A hollow point does the same thing but causes a significantly larger wound channel, more tissue destruction, and greater blood loss. The additional damage doesn’t provide a meaningful military advantage, so it’s classified as superfluous.
The International Committee of the Red Cross frames it this way: weapons that inevitably cause serious permanent disability or make death inevitable are the primary targets of this rule. The ban on expanding bullets sits alongside restrictions on blinding laser weapons and incendiary weapons as direct applications of the same principle.
Why Police Still Use Them
If hollow points are too brutal for war, it seems paradoxical that they’re standard issue for nearly every police department in the world. The reasoning comes down to context. In a law enforcement scenario, officers fire weapons in populated areas, often indoors, with bystanders nearby. A full metal jacket round can pass straight through a person and hit someone standing behind them, or ricochet off hard surfaces. Hollow points expand on impact, which means they slow down and stop inside the target. That dramatically reduces the risk to bystanders.
The laws of war don’t apply to domestic policing. The Hague Declaration specifically governs international armed conflict between nations, so police agencies are free to choose ammunition based on what’s safest for the public. The same logic applies to civilian self-defense: hollow points are legal for personal use in most countries precisely because overpenetration is a serious safety concern.
The U.S. Position Is Complicated
The United States never ratified the 1899 Hague Declaration on expanding bullets, which gives it a unique legal position. For decades, the U.S. military still followed the ban as a matter of policy rather than legal obligation. That changed significantly in 2015, when the Department of Defense released its Law of War Manual. Section 6.5.4.4 states plainly that “the law of war does not prohibit the use of bullets that expand or flatten easily in the human body.” The manual’s position is that hollow points are only prohibited if they are “calculated to cause superfluous injury,” a much narrower standard than a blanket ban.
Legal experts called this a major shift in U.S. policy. In practical terms, it opened the door for military units to select expanding ammunition when it serves a specific tactical purpose, such as close-quarters operations where overpenetration poses a risk to hostages or civilians.
Open Tip Match: The Gray Area
There’s a type of ammunition that blurs the line and has been used by U.S. forces for years. Open tip match rounds look superficially like hollow points because they have a small opening at the tip. But they exist for a different reason entirely. The opening is a byproduct of the manufacturing process used to make the bullet more aerodynamically consistent, which improves long-range accuracy. They were originally designed for competitive target shooting.
The official U.S. justification is that because these rounds aren’t “designed” to expand, they don’t violate the Hague prohibition, even though their terminal effects on the body can be quite different from standard full metal jacket rounds. Due to their thin jackets and reverse-drawn construction, open tip match bullets often fragment violently on impact with soft tissue. The distinction between “designed to expand” and “happens to fragment” is a legal one, not a ballistic one, and it remains contested among international law scholars. The practical result is that U.S. snipers and designated marksmen have used these rounds extensively in Iraq and Afghanistan.
Who Enforces the Ban
The 2010 Kampala amendments to the Rome Statute of the International Criminal Court extended the prohibition on expanding bullets to cover non-international armed conflicts as well, not just wars between nations. Over 30 countries have ratified these amendments, including Germany, Austria, Finland, Poland, and New Zealand. The United States is not among them, nor are Russia or China.
Enforcement is largely a matter of international pressure and military culture rather than active prosecution. No soldier has been tried at the ICC specifically for using expanding ammunition. The ban functions more like a norm that shapes procurement decisions and rules of engagement across most of the world’s conventional militaries. For nations that have ratified the relevant treaties, issuing hollow point ammunition to infantry troops would be a clear violation. For those that haven’t, the calculus is more flexible, governed by internal policy rather than binding international obligation.