JHP

A Jacketed Hollow Point, or JHP, bullet is a bullet designed to expand when it enters its target. The bullet's nose, rather than being pointed, is recessed (hence "hollow point"). When a JHP bullet penetrates soft tissue, the lead around this cavity is forced outward, causing the bullet to "mushroom," widening its diameter and resulting in a wider wound channel. JHP bullets do not penetrate armor well, In Fallout this is reflected by having JHP bullets do more damage to a target, but having sub-par armor penetration. This means that although you may hit a target for 18 damage, the target's armor may very well absorb a good deal of it.