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1. The FMJ bullet still has the base of the lead core exposed, a TMJ head is usually used in match shooting and has the lead core completely encased in copper.
2. The full jacket of the TMJ or Total Metal Jacket prevents separation of the lead core with the copper jacket, preventing the lead from blowing out.
It is being used more and more as it also prevents much lead pollution as most of the lead expelled in the air by a firearm comes from vaporization of lead at the base of the bullet, which is covered by copper in the TMJ design.
A shotgun, whose shot shell base is covered by a plastic or paper wad, produces the most lead in the air because of the great number of lead pellets abrading the barrel.
A handgun or rifle shooting an exposed lead base bullet produces the next greatest amount of lead in the air.
The TMJ design produces the least lead pollution.
What else can I help you with?
Is there a difference between full metal jacket rounds and total metal jacket rounds for a gun?
Yes. FMJ, the base is exposed. TMJ no lead exposed.
What is tmj ammunition?
TMJ = Total Metal Jacket. <><><><> Typically a lead core, with a jacket of copper/nickel alloy that completely encases the lead core.
What us ball ammo?
Ball ammunition has a soft lead core and a full or sometimes total metal jacket made of gilding metal, cupronickle, or steel alloy.
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