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IMI Ammo 5.56x45mm NATO 55 Grain M193 Full Metal Jacket Boat Tail

(5 customer reviews)



IMI Ammo 5.56x45mm NATO 55 Grain M193 Full Metal Jacket Boat Tail

IMI Ammo 5.56x45mm NATO 55 Grain M193 Full Metal Jacket Boat Tail USA. Established in 1933, IMI is a defense systems house specializing in the development, integration, manufacturing, and life cycle support of modern land, air, and naval combat systems and HLS solutions. IMI’s world-class combat-proven systems are developed by vertically integrated expert teams, working in close cooperation with the customers, the most prominent being the Israel Defense Forces (IDF). IMI’s products have been qualified with the IDF, US Military (Air Force, Army, and Navy), and NATO nations.

Barnes Vor-Tx 5.56x45mm NATO 70gr TSX BT 500 rounds

This ammunition is a great choice for the shooter looking for an affordable round for target shooting, training, and practice. This ammunition is new production, non-corrosive, in boxer-primed, reloadable brass cases.

Please Note: While the 5.56x45mm NATO will fit in a .223 Remington chamber, the 5.56 is a military round that runs at higher pressures than its .223 counterpart and is not recommended to be fired in a .223 Remington chamber.

IMI Ammo 5.56x45mm NATO Features

  • Convenient 30 round boxes completely fill standard capacity magazines
  • Ideal for use in M16A1 and other standard rifles with a 1:12″ or faster barrel twist.
  • Complies with MIL-C-9963F specifications
  • In use by the IDF and NATO forces
5.56x45mm NATO
Grain Weight
55 Grains
(500 and 1000 rounds)
Muzzle Velocity
3215 Feet Per Second
Muzzle Energy
1262 Foot Pounds
Bullet Style
Full Metal Jacket
Case Type
Test Barrel Length
24 Inches
Velocity Rating


IMI Ammo 5.56x45mm NATO 55 Grain

IMI Ammo 5.56x45mm NATO Types

The majority of 5.56×45 rounds sold today are full metal jacket (FMJ) or full metal jacket boat-tail cartridges. Incredibly fast, with a muzzle velocity that’s generally more than 3,000 feet per second, you’ll find IMI Ammo 5.56x45mm NATO ammo with a 62-grain projectile as well as lighter rounds with a common 55-grain bullet. In either case, you can expect muzzle energy to be in the ballpark of 1,300 foot pounds.

.223 Remington vs. IMI Ammo 5.56x45mm NATO

IMI Ammo 5.56x45mm NATO 55 Grain

While the civilian .223 Remington round is very similar, it is not the same as 5.56×45 ammunition. The two cartridges are loaded to different pressures when adhering to SAAMI (Sporting Arms and Ammunition Manufacturers Institute) specifications. Because of that difference in pressure, you may run into trouble if you elect to fire 5.56x45mm NATO rounds from a chamber with a shorter .223 Rem leade.

IMI Ammo 5.56x45mm NATO for Sale at

IMI Ammo 5.56x45mm NATO is one of the most popular calibers at While there are a number of reliable rounds, the most popular manufacturers of the NATO round tend to be produced by Lake City, Federal American Eagle, and PMC (Precision Made Cartridge).

Many shooters view the .223 and 5.56 as identical or at least interchangeable rounds. Well, listed case dimensions are the same, and each will chamber in barrels bored for the other. But that’s not the full story.

IMI Ammo 5.56x45mm NATO
Do you own an AR like this SAINT? Do you know what ammo to load in it?

Hornady engineers tell me the .223 Remington is stoked to 55,400 CUP (Copper Units of Pressure), a level specified by SAAMI (the Sporting Arms and Ammunition Manufacturers Institute). Service loads for the 5.56×45 NATO generate 58,500. Chamber dimensions and rifling twist vary among the myriad AR-15s and bolt rifles barreled to .223, but the 5.56 commonly gets a longer throat. “Roughly .125 more freebore,” say the white-coats bearing micrometers.

Can You Shoot .223 in a 5.56 Rifle?

It is generally accepted that commercial .223 Rem ammunition like the Norma Tactical .223 can be safely shot in any firearm chambered for the 5.56 NATO cartridge. However, given common differences in loads and throats, it’s a good idea not to use 5.56mm ammo in a firearm with a dedicated .223 chamber.

In 1979, SAAMI cautioned that 5.56 chambers differ from those in .223 sporting rifles, and that use of 5.56 ammo in .223 rifles could jack pressures to unsafe levels. The reverse – .223 in a 5.56 chamber – doesn’t have the same pressure concerns.

So what does that mean for your firearm?

In the case of Springfield Armory’s SAINT .22-bore rifles and pistols, they are described as “multi-caliber”, meaning they’re designed to function well and safely with both .223 and 5.56mm rounds.

IMI Ammo 5.56x45mm NATO
IMI Ammo 5.56x45mm NATO
Are they the same? Here the 5.56’s crimp distinguishes it (at left).

.223 vs. 5.56: Fraternal or Identical?

The lineage of these enigmatic twins dates to 1957, when the .223 popped up as an experimental cartridge for what would become the M16 infantry rifle. Working with Gene Stoner, Bob Hutton at Guns & Ammo magazine paired a 55-gr. bullet with a case a tad longer than a .222’s cartridge case. The tiny missile exited at 3,250 fps and met a retained-velocity spec of supersonic flight to 500 yards.

Adopted in 1964 as the 5.56mm Ball cartridge, M193, it was issued to U.S. forces in Vietnam, and after that tour until 1984. In 1980 it earned the approval of NATO nations, which substituted an FN-designed 62-grain SS109 boat-tail bullet. The SS109 left the gate at 3,100 fps. Its superior ballistic coefficient ensured harder hits at distance. Faster 1-in-7 rifling twist maintained accuracy. The U.S. Army called this load the M855. By then, case length in millimeters had joined the moniker. So was born the 5.56×45 NATO.

IMI Ammo 5.56x45mm NATO
Popular 55-gr. loads can shoot well from a 1-in-12 twist. A faster spin helps with longer bullets.

It was soon recognized that the round had a lot of merit for use in sporting rifles. Naturally. The .223’s design owed much to the popularity of the .222 Remington round that had been introduced in 1950. The “triple deuce” cleaned up at Benchrest meets and bumped pelt counts for fox hunters. The .223’s 1.76″ case is just .06 longer than the .222’s. But the .223 has a shorter neck and holds 20 percent more powder.

As rifles and loads were developed for the new .223 round, a shorter throat and steeper leade (ramp angle of the lands in front of the throat) was employed. A tiny rodent behind the crosswire demanded fine accuracy not required on the battlefield. An infantry rifle’s priority was function, often in trying conditions hunters didn’t endure. No matter the weather, the grit and debris and egg-cooking barrel temperatures, perhaps long-nose tracer bullets awaiting their chance to jam, a soldier needed the bang!

IMI Ammo 5.56x45mm NATO
The .223 is a relatively short cartridge designed for more compact rifles. It is shown here with the larger 6.5 Creedmoor.

As a result, M16s got generous chambers. Bolt-action rifles enjoyed tighter tolerances, shorter bullet jump and slower 1-in-12 rifling for popular 40- to 55-gr. varmint bullets. But, today’s AR’s in the civilian market have proven to be extremely capable of impressive accuracy as well.

Hornady Frontier 6.5 Grendel Ammo 123 Grain Full Metal Jacket

No Looking Back

The .223 has piled up a mountain of commercial loads as compared to relatively few of the 5.56 NATO. Winchester alone lists 18! Remington has 13. So does Hornady, from a 35-gr. NTX bullet at 3,760 fps to a 75-gr. Superformance Match BTHP at 2,930. Federal catalogs a dozen .223 loads, including a 60-gr. Nosler Partition at 3,160 fps and a 62-gr. Trophy Bonded Tip at 3,050. Swift loads a 75-gr. Scirocco. Black Hills Ammunition rips tons of ballistic gelatin refining .223 loads (15) and 5.56 (8), as it supplies U.S. troops with mil-spec 5.56.

IMI Ammo 5.56x45mm NATO
Tiny groups like these are very possible with quality ammo and a good rifle.

The .223’s credentials on prairie dogs and coyotes hardly need defending. But where it’s legal for deer, hunters debate. Two-two-three acolytes dig out ballistics charts. “The .44-40 has laid low countless deer with 200-gr. bullets that bring 450 ft-lbs to 100 yards. Winchester’s 64-gr.Power-Point — hardly the frothiest .223 load — delivers 1,000 ft-lbs there and trumps the bullet weight/animal weight and bullet energy/animal weight ratios of 175-gr. 7mm Magnum bullets on elk!” The advent of stoutly built .22 game bullets like Remington’s Core-Lokt Ultra Bonded, Nosler’s Partition, Hornady’s GMX and Swift’s Scirocco argue in favor of the .223’s use on deer.

Hornady Frontier 6.5 Grendel Ammo TAGs

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SHOP Hornady Frontier 6.5 Grendel Ammo

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Look at our huge determination of in-stock ammo. We convey every one of the most famous types and a gigantic determination of more specialty types as well. Anything you desire, we have it estimated modest


500 round, 1000 round

5 reviews for IMI Ammo 5.56x45mm NATO 55 Grain M193 Full Metal Jacket Boat Tail

  1. Angel (verified owner)

    Very fast delivery.

  2. Matthew (verified owner)

    The product is firmly packed.

  3. Paul (verified owner)

    Good service.

  4. Kaden Arabic (verified owner)

    Good service.

  5. Ryan (verified owner)

    Good service.

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