Hollow Point. Essentially, it is hollow. A brand name is Black Talon, because when it hits, outsides of the bullet cone flare open like a birds talons.
Try to draw something like this
Full Metal Jacket
Fire!..........Penetration....Wound....Over-penetration
=>....[ ]...... } =>]......... } }.............=>
Full Metal Jacket
Fire!..........Penetration...Larger Wound......Stopping Power
=>...[ ].........=}< ]..............0 =|]................00=|]
This creates a much larger wound. It also slows the bullet significantly. This results in more of the kinetic energy of the round being put into the body. Full metal jacket does not deform much. So the wound is neater and often results in what people call over-penetration. The bullet will fly right through the body and keep moving. All of the energy retained by the bullet once it has passed through the body is "wasted".
Gotta run, I will help some more later if someone else hasn't already
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