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 PMC - 55gr FMJ
Regular Price: $479
On Sale: $429
40 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
Regular Price: $474
On Sale: $430
35 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Fiocchi - 55gr FMJBT M193
$43942 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by CBC/Magtech - 55gr FMJ M193
$44033 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ M855
Regular Price: $489
On Sale: $449
44 Ready to Ship
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800 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ
$36917 Ready to Ship
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125 Rounds of 5.56x45 Ammo by Winchester USA VALOR - 62gr FMJ M855
$63.5038 Ready to Ship
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1000 Rounds of 5.56x45 Ammo In Plastic Battle Packs by PMC - 55gr FMJ
$50919 Ready to Ship
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50 Rounds of 5.56x45 Ammo by CBC - 55gr FMJ M193
$25.50104 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Fiocchi - 55gr FMJBT M193
$27119 Ready to Ship
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30 Rounds of 5.56x45 Ammo by ZSR - 55gr FMJ M193
$16.75105 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
$11.45 As low as: $10.50148 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Magtech - 62gr FMJ
$30105 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
$12.05 As low as: $10.75159 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$12.55 As low as: $10.75136 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$13.50169 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 68gr BTHP Match
$33911 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT Match
Regular Price: $369
On Sale: $349
33 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Prvi Partizan - 55gr FMJBT M193
$14.25151 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr FMJ M193
$16138 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 62gr FMJ
$17932 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT
$19.50137 Ready to Ship
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5.56x45 - 62 Grain FMJ - Hornady BLACK - 20 Rounds
$21.25136 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$22934 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady Superformance Match - 75gr HPBT
$27411 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills - 77gr OTM
$73917 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 69gr OTM
$7414 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills - 77gr OTM
$74.50167 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 77gr TMK
$7498 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 77gr Polymer Tipped
$79.50118 Ready to Ship
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460 Rounds of 5.56x45 Ammo by Black Hills Ammunition in Ammo Can - 77gr OTM Mk 262 MOD 1-C
$80987 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 62gr TSX
$9509 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).