Overall, M193 is not very effective at penetrating barriers and is completely ineffective against modern body armor.
As M193 fires relatively small projectiles, terminal performance will suffer without fragmentation and only small wounds will be inflicted.Īnother issue was the bullet’s tendency to deflect when it encountered barriers like thick clothing or vegetation (I hear there’s a lot of that in Vietnam). However, there are some downsides to the M193.īullet fragmentation was not always observed on the battlefield, with many soldiers reporting their rounds merely passing through enemy combatants. This makes it a good choice for self defense, as the bullet fragments cause additional damage and limit over penetration. One of the major benefits of 55 grain projectiles are their propensity to yaw and fragment when it encounters soft tissue. How convenient that the original M16 used that exact barrel length…it’s almost like they planed it that way!
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In general, the M193 round is stabilized effectively in barrels ranging between a 1:9 to a 1:12 twist rate and reaches their full muzzle velocity potential from a 20” barrel. The primer pocket was also metallically crimped in place to avoid primers backing out (and potentially striking the shooter’s eye) during fully automatic fire.Įarly M16s sported a relatively slow 1:12 barrel twist rate that stabilized the 55-grain bullet extremely well. The M193 cartridge was chemically sealed at the case mouth and primer pocket to ensure moisture resistance. The M193 saw its first action in the jungles of Vietnam and was our frontline battle cartridge until late 1980 when the military switched to M855 ammo (more on that in a moment). Once adopted in 1964, the 223 Remington round was designated as “Cartridge, 5.56 mm ball, M193”. Developed as the 223 Remington, the new military ammo was designed to fire a 55 grain full metal jacket (FMJ) boat tail projectile sporting a soft lead core with a muzzle velocity of 3,250 fps and a maximum of 55,000 psi chamber pressure.
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