What do full metal jacket rounds do?

What do full metal jacket rounds do? A Full Metal Jacket (FMJ) is a bullet that has a soft core, usually with lead, and is encased in a harder alloy metal such as cupronickel or gilding metal. The purpose of these rounds is to hold their trajectory, and they have greater penetration against soft tissue.

A Full Metal Jacket (FMJ) is a bullet that has a soft core, usually with lead, and is encased in a harder alloy metal such as cupronickel or gilding metal. The purpose of these rounds is to hold their trajectory, and they have greater penetration against soft tissue.
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