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Bullets weighing 2.6 g (40 grains) or less are recommended for optimal use in 5.7×28mm applications, [47] but the 228.6 mm (1:9 in) rifling twist rate (distance the bullet must travel to complete one full revolution) used in the firearms' barrels will stabilize bullets weighing up to 4.5 g (70 grains).
It was originally named the MMJ 5.7mm [1] by its designer and is also known in the U.S. as the 5.7mm Johnson, the Johnson MMJ 5.7mm Spitfire, and the .22 Johnson, (or 5.7×33mm internationally). In 1963, Melvin M. Johnson developed a conversion of the M1 Carbine (by either relining or re-barreling the M1 Carbine ) to a .224 caliber bore, using ...
The 7mm Penna, also known as the 7×23mm is a handgun cartridge designed by Leonardo Penna for law enforcement applications. [ 1 ] [ 2 ] The cartridge utilises a novel lightweight, pointed projectile made from brass travelling at high velocity with the intention of giving it limited armor-piercing capabilities and greater stopping power .
The vehicle has an armored capsule that protects the 10-man crew against 5.45 mm and 7.62 mm bullets. It also withstands the blast of an explosive device equivalent to 2 kg of TNT under its wheels or bottom. The fuel tanksre protected by a liquid coating that seals bullet-pierced holes and prevents fuel leakage.
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The first major company to produce the 7mm STW was A-Square in 1994. [5] The 7mm STW graduated to commercial status when it was officially recognized by SAAMI in 1996, [6] and the Remington Arms Company started to produce it in 1997, [7] with other ammunition manufacturers following.
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