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 Wolf Gold - 55gr FMJ
Regular Price: $564.00
On Sale: $524.00
84 Ready to Ship
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900 Rounds of 5.56x45 Ammo by Australian Defense Industries in Ammo Can - 62gr FMJ F1
Regular Price: $545.00
On Sale: $480.00
79 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
$559.0080 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
$569.0077 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ
Regular Price: $599.00
On Sale: $574.00
82 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester - 62gr FMJ Green Tip
Regular Price: $604.00
On Sale: $590.00
76 Ready to Ship
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800 Rounds of 5.56x45 Ammo by Winchester - 62gr FMJ M855
$479.0015 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 62gr FMJ M855
$599.0082 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$609.0031 Ready to Ship
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1250 Rounds of 5.56x45 Ammo by Winchester USA VALOR - 55gr FMJ M193
$765.003 Ready to Ship
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125 Rounds of 5.56x45 Ammo by Winchester USA VALOR - 55gr FMJ M193
$80.00132 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Federal American Eagle - 55gr FMJ XM193
$324.0085 Ready to Ship
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100 Rounds of 5.56x45 Ammo by Federal American Eagle - 55gr FMJ XM193
$70.00125 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
$15.25113 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 68gr BTHP Match
$499.007 Ready to Ship
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500 Rounds of 5.56x45 Ammo by IMI - 77gr OTM
$574.0064 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 69gr OTM
$67.0035 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady Superformance Match - 75gr HPBT
$299.0062 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 77gr TMK
$749.006 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Barnes Precision Match - 69gr OTM
$30.5058 Ready to Ship
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200 Rounds of 5.56x45 Ammo by Hornady BLACK - 75gr InterLock HD SBR
$319.0076 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
$739.0038 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Superformance Match - 75gr HPBT
$32.50108 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Barnes Precision Match - 85gr OTM
$32.50149 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 50gr TSX
$89.0042 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).