Police and civilians who carry a firearm for self-defense often load with "hollow point" bullets. These have a copper jacket around the lead core except at the point or tip of the bullet where there is an open hole exposing the lead core. When this bullet strikes a body, it will flatten or "mushroom" which does two things: it transfers more energy impact to the body struck, and it cause the bullet to lose speed rapidly and stop in the body. The hollow point bullet is more likely to knock down and damage the target, and less likely to penetrate the target and harm an innocent victim.

The connection to the Laws of Armed Conflict is the Hague Convention of 1899, Declaration III - back then, all the civilized nations got together and decided that soldiers could only fire "Full Metal Jacket" bullets at each other. This is a lead core completely enclosed in a copper jacket. Actually, on the battlefield, this round may be superior, it is more likely to pass through the target and hit someone else, wounding two men with one bullet, and it is more likely to wound than to kill. A dead soldier can be ignored until after the battle is over, but a live, wounded soldier ties up other soldiers who treat his wounds and move him to medical care.

The solution for the Jihadis - I've mentioned a few times my idea of stuffing hollow point bullets with bits of bacon to slay Muslim vampires. But what are our GIs to do since they can not fire hollow point bullets. American GIs are the "good guys" they follow all the civilized conventions and treaties for warfare. Their bullets are legal "Full Metal Jacket" only. We kill humanely. There's no place to put the bacon.  -- When you read the headline you may have thought that I meant "solution" as in an answer. Actually I meant "solution" as in a liquid, but it is the perfect answer for the dilemma too.

Ladies and Gentlemen: Silver Bullet Gun Oil.