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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500 Rounds of 5.56x45 Ammo by IMI - 55gr FMJ M193
32 Ready to Ship
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1200 Rounds of 5.56x45 Ammo by Israeli Military Industries - 55gr FMJ M193
$525.0032 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
81 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
Regular Price: $474.00
On Sale: $449.00
83 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester - 62gr FMJ M855
$529.0078 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester USA - 55gr FMJ M193
$539.0070 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Winchester - 62gr FMJ Green Tip
$559.0041 Ready to Ship
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1000 Rounds of 5.56x45 Ammo by Federal - 55gr FMJBT
$560.0076 Ready to Ship
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600 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ
$339.0081 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr HP Match
$289.0048 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Federal American Eagle - 55gr FMJBT XM193
$299.0063 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 68gr BTHP Match
$329.0066 Ready to Ship
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500 Rounds of 5.56x45 Ammo by Hornady Frontier - 75gr HPBT Match
$374.004 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 55gr FMJ
$15.55 As low as: $14.00104 Ready to Ship
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420 Rounds of 5.56x45 Ammo by Winchester in Ammo Can - 62gr FMJ M855
$339.0032 Ready to Ship
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20 Rounds of 5.56x45 Ammo by PMC - 62gr FMJ XM855
$16.25 As low as: $14.75161 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Prvi Partizan - 55gr FMJBT M193
$16.50161 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Hornady Frontier - 55gr HP Match
$17.5071 Ready to Ship
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5.56x45 - 62 Grain FMJ - Hornady BLACK - 20 Rounds
$22.00157 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 69gr OTM
$60.0088 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Barnes Precision Match - 85gr OTM
$28.002 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Barnes Precision Match - 69gr OTM
$28.75117 Ready to Ship
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20 Rounds of 5.56x45 Ammo by Barnes VOR-TX - 62gr TSX
$32.0035 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 77gr OTM MK 262 Mod 1-C
$82.50146 Ready to Ship
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50 Rounds of 5.56x45 Ammo by Black Hills Ammunition - 50gr TSX
$89.00127 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).