Bulk 5.56x45 Ammo
5.56x45 NATO Ammunition
5.56x45 ammo derived from the .222 cartridge and was officially adopted as the standardized NATO round in 1963. Essentially, 5.56x45 as a caliber came into being because the military was using 7.62x51 and critics believed the larger round was too powerful for light service rifles, leading to rough recoil and a slower than desired rate of fire in military service rifles. Today, the NATO standard cartridge is designated as “M855”. You’ll often find it in-stock and available to shooters. We also carry a huge in-stock selection of .223 ammo for sale here.
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1000 Rounds of 5.56x45 Ammo by CBC/Magtech - 55gr FMJ M193
Regular Price: $440
On Sale: $410
84 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$4448 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ M855
Regular Price: $489
On Sale: $449
13 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Magtech - 62gr FMJ
$45483 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Fiocchi - 55gr FMJBT M193
$45984 Ready to Ship
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800 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ
$36940 Ready to Ship
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1000 Rounds of 5.56x45 Ammo In Plastic Battle Packs by PMC - 55gr FMJ
$50936 Ready to Ship
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50 Rounds of 5.56x45 Ammo by CBC - 55gr FMJ M193
$25.5068 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 62gr FMJ M855
$52481 Ready to Ship
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840 Rounds of 5.56x45 Ammo in Stripper Clips by PMC X-TAC - 55gr FMJBT in Ammo Can
$45516 Ready to Ship
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800 Rounds of 5.56x45 Ammo by Winchester - 62gr FMJ M855
$43941 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr FMJ M193
$27.75164 Ready to Ship
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30 Rounds of 5.56x45 Ammo by ZSR - 55gr FMJ M193
$16.75121 Ready to Ship
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840 Rounds of 5.56x45 Ammo by PMC X-TAC - 62gr FMJ M855 in Bandolier in Ammo Can
$46914 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Fiocchi - 55gr FMJBT M193
$28112 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
$11.45 As low as: $10.50122 Ready to Ship
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200 Rounds of 5.56x45 Ammo in Plastic Battle Packs by PMC - 55gr FMJ
$11584 Ready to Ship
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600 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ
$35436 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Magtech - 62gr FMJ
$30116 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
$12.05 As low as: $10.75149 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$12.55 As low as: $10.75117 Ready to Ship
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120 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ M855 in Battle Packs
$7987 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$13.50141 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Prvi Partizan - 55gr FMJBT M193
$14.25114 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 68gr BTHP Match
$35924 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Federal American Eagle - 55gr FMJBT XM193
$14.7524 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT Match
$36943 Ready to Ship
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420 Rounds of 5.56x45 Ammo by Winchester in Ammo Can - 62gr FMJ M855
$36441 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT
$19.50112 Ready to Ship
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5.56x45 - 62 Grain FMJ - Hornady BLACK - 20 Rounds
$21.25105 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$24926 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$25.501 Ready to Ship

5.56x45 Ammo Types
The majority of 5.56x45 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 5.56 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. 5.56x45 Ammo

While the civilian .223 Remington round is very similar, it is not the same as 5.56x45 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.
Popular Rounds for Sale at BulkAmmo.com
5.56x45mm is one of the most popular calibers at BulkAmmo.com. 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).