Full Metal Jacket. The lead core is covered by a thin jacket of metal.
FMJ
Full Metal jacket.
9mm Luger full metal Jacket.
Springfield was the name of the arsenal that made the rifle. FMJ (full metal jacket) refers to the type of bullet used in the cartridge. If both are 30-06, they are both capable of being fired together.
FMJ simply means Full Metal Jacket (no exposed lead on the bullet) and does not refer to a make of gun, but a style of ammunition. The link below is to a Wikipedia article on the .45 ACP, and shows a photo of the cartridge.
7.62 is the ammunition's diameter, expressed in millimeters. Full metal jacket (FMJ) means that the bullet is made of lead, and fully jacketed with a (usually brass) covering.
fmj make more dameage on your target when he/she is in cover XD
tmj thin metal jacket (bullet) fmj full metal jacket (bullet)
If you're trying to shoot through steel, then that'll depend on the thickness and density of the steel, as well as what you're shooting it with. For regular steel targets which you're not trying to shoot through, you typically use regular FMJ ball ammunition, and only fire loads recommended by the manufacturer for the specific target.
Over penetrate what? It all depends on what you are shooting at. A 223 FMJ round will go through a person, drywall, car doors, even solid wood doors. If you can be more specific, I can help you out.
No, they do not.
well fmj stands for Full Metal Jacket making the damage thicker and more able to kill