The most successful defensive bullet design has historically been the jacketed hollow point, or JHP. These bullets have a lead core that expands and transfers energy, as well as a partial copper jacket that controls the expansion of the lead for deep penetration.
The jacket on a JHP provides a barrier that decreases the amount of lead that is left behind within the barrel of your gun. Without that jacket (like an HP bullet), the lead can quickly begin to occupy the rifling of your barrel after each round exits your firearm.
JHP rounds are more accurate than FMJ rounds because ammo manufacturers can maintain better tip shape consistency. The rounded tip shape of full metal jackets can become easily warped or dinged, reducing accuracy. The aerodynamic properties of hollow point bullets’ aerodynamic properties are superior