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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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 50gr TSX
$104.5030 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 62gr Barnes TSX
$9854 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 62gr TSX
$9509 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
$80989 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 69gr OTM
$7415 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills - 77gr OTM
$73937 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady Superformance Match - 75gr HPBT
$27423 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$25.5022 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$22940 Ready to Ship
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5.56x45 - 62 Grain FMJ - Hornady BLACK - 20 Rounds
$21.25170 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT
$19.50102 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 62gr FMJ
$17937 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr FMJ M193
$16168 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Prvi Partizan - 55gr FMJBT M193
$14.25164 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
30 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 68gr BTHP Match
$3395 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$13.50165 Ready to Ship
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120 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ M855 in Battle Packs
$7952 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$12.55 As low as: $10.75110 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
$12.05 As low as: $10.75111 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Magtech - 62gr FMJ
$30170 Ready to Ship
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600 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ
$35411 Ready to Ship
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30 Rounds of 5.56x45 Ammo by ZSR - 55gr FMJ M193
$16.75112 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
$46911 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
$4558 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Fiocchi - 55gr FMJBT M193
$27152 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 62gr FMJ M855
$52437 Ready to Ship
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50 Rounds of 5.56x45 Ammo by CBC - 55gr FMJ M193
$25.50138 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr FMJ M193
$25.5085 Ready to Ship
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1000 Rounds of 5.56x45 Ammo In Plastic Battle Packs by PMC - 55gr FMJ
$50924 Ready to Ship
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125 Rounds of 5.56x45 Ammo by Winchester USA VALOR - 62gr FMJ M855
$63.50243 Ready to Ship
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800 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ
$36937 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).