Depends on what you do with it.
FMJ is better for practice and military use due to lower cost.
AP is better at making holes in light armor and steel plates.
FMJ - the projectile is covered in a metal jacket. May or may not be AP AP - the projectile will penetrate armor
Full Metal Jacket. The lead core is covered by a thin jacket of metal.
Full Metal Jacket.
tmj thin metal jacket (bullet) fmj full metal jacket (bullet)
full metal jacket
Call your local building inspector. You will probably, because of what this building is, have to use Armored Cable, which has a metal jacket, to wire it.
amour made of joind metal links
"Full Metal Jacket" was filmed in England ~ see related link below for additional information .
gilded metal jacket (GMJ) is basically the same as full metal jacket (FMJ) in that it provides a metal casing on a bullet core. The difference in the two metal jackets is the method of application. The full metal jacket (FMJ) is a casing that is applied to the core while the gilded metal jacket (GMJ) is plated directly on the core. For all intents and purposes, the GMJ rounds perform the same as FMJ rounds, but are less costly to manufacture, and therefore cost less to buy.
your body would be rejecting the piercing
A full metal jacket (or FMJ) is a bullet consisting of a soft core (usually made of lead) encased in a shell of harder metal .
a magazine full of live rounds//Full Metal Jacket means: A full metal covering of the led bullet which is usually copper. A magazine full of live rounds would have rounds (bullets) with a Full Metal Jacket. :D