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! 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”. The M193 cartridge was developed in the early 1960’s and was adopted for the US military’s new rifle, the M16.ĭeveloped 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. In short, a 223 Rem can safely be fired from a rifle or handgun chambered in 5.56, however the opposite is not true. You can read more about those differences here: 223 vs 5.56. Some shooters will refer to them interchangeably, but this is a mistake.Īlthough the 223 Rem and 5.56 have identical external dimensions, the two rounds are slightly different. Many new shooters might be confused about the differences between the 223 Remington and 5.56x45mm NATO cartridges. A Quick Note on Nomenclature: 223 Remington vs 5.56 NATO If you’re ready to load your mags with either of these amazing 5.56 cartridges, make sure to check out our bulk 5.56 ammo offerings, otherwise keep reading and learn WHY M193 ammo is my first choice. However, M855 green tip ammo offers better penetration and is slightly more accurate at longer distances. If I had to make a recommendation on which ammo to stockpile, my go-to answer is “Both!”īut in general, M193 ammo is the better choice to buy in bulk as it is less expensive and has better self-defense capabilities. You’ve already made the hard decision on which rifle to purchase, but now you need to know which 5.56 ammo to feed it: M193 vs M855. ![]() Not only do you have an amazing rifle that is perfect for plinking, self-defense, and small game hunting, but you also have a tool that is capable of defending freedom. First off, congratulations on the new AR-15, Ruger Mini-14, IWI Tavor, Kel-Tec RDB, FN SCAR 16S, or whatever rifle you own chambered in 5.56 NATO.
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