Why does US military use 556?

223 rounds and later, the 5.56 mm rounds. The smaller rounds weighed less, allowing troops to carry more ammunition into the fight. They also created less recoil, making it easier to level the weapon back onto the target between rounds and making automatic fire easier to manage.

How many rounds does a Marine carry?

The standard load out for a Marine would be six magazines, normally only loaded with 25 or 28 rounds, to protect the spring, for a total of 150-168 rounds.

What is the difference between a 7-62 and a 556?

The 5.56 is shorter, thinner and lighter than the 7.62. It was proved during military testing that a soldier could carry 200 more rounds of 5.56 than the larger cartridge. The 7.62 shoots a larger, heavier bullet. The NATO round was a 150-grain full-metal-case (fmj) projectile. The first 5.56 NATO round fired a much lighter 55-grain fmj projectile.

What is the difference between a 7-62 and a 9-mm?

A 5.56 and 7.62 are about 55000 and 60,000 psi respectively. A 9mm is about 35,000 psi. More powder – The higher pressures are enabled by a larger amount of fast burning powder. The case volume of a rifle cartridge is generally much larger than that of a pistol cartridge. A 7.62×51 holds about 56 grains of powder. A 9m

What is the difference between the Remington 5-56 & 7-62 rifles?

The 5.56 recoil is approximately 50 percent less. The 5.56 was derived from the .223 Remington. The bore of the 5.56 is .22, the same diameter as the .22 rimfire. The 7.62 was developed from the .308 Winchester rifle cartridge and designed to replace the U.S. military’s .30-06 Springfield rifle cartridge.

What is the difference between a NATO round and a 7-62?

Its bore is .30, which is considered a large caliber. The 5.56 is shorter, thinner and lighter than the 7.62. It was proved during military testing that a soldier could carry 200 more rounds of 5.56 than the larger cartridge. The 7.62 shoots a larger, heavier bullet. The NATO round was a 150-grain full-metal-case (fmj) projectile.