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Total Metal Jacket Bullets

Total Metal Jacket ("TMJ") (also known as "Full Metal Case") is often mistaken for a similar bullet, the Full Metal Jacket ("FMJ"). However, these two types of bullets are not the same. Specifically, the difference between an FMJ and a TMJ lies in the base of the round.

In as FMJ the base of the bullet is exposed lead, and in the TMJ the bullet is fully covered with a copper plating. The TMJ is primarily used in Match shooting as TMJs are more accurate than a traditional FMJ. Some indoor ranges require TMJ rounds to reduce the amount of lead contaminants in the air. Note that TMJs are not recommended for ported firearms, as the casing may be sheared off as the bullet leaves the barrel.

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