Performance in Ballistics and Terminal Ballistics When a bullet full metal jacket strikes a target, its behavior is largely predictable due to its rigid structure. The exterior shell, usually copper or a copper alloy, serves two critical purposes: it protects the lead core from deformation during the high-pressure stress of firing and during handling, and it reduces barrel fouling by minimizing direct contact between the lead and the rifling.
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Barrel longevity: The jacket protects the bullet from leading, which can accumulate in the barrel and affect accuracy, thus extending the functional life of the rifling. Unlike hollow-point or soft-point bullets designed to expand, FMJ projectiles are intended to penetrate deeply and maintain their shape.
Shooters appreciate the clean burn of the ammunition and the lack of leading in the firearm, which allows for extended periods of practice without the need for frequent barrel cleaning. Reliability: The robust construction resists deformation in the magazine and during the feeding cycle, ensuring smooth operation in semi-automatic firearms.
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In disciplines such as International Practical Shooting Confederation (IPSC) matches or steel target training, the FMJ's ability to penetrate steel targets without causing dangerous spall—fragments of the target that break off and fly back—is highly valued. The term bullet full metal jacket describes a specific category of ammunition where the lead core is entirely encased within a harder metal shell, typically gilding metal or copper.
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