AmmoSpecs
5.56x45mm NATO
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5.56x45mm NATO
History & Design Intent
The 5.56x45mm NATO is one of the cartridges cataloged in the AmmoSpecs ballistics database. Cartridge designations describe a specific combination of bore diameter, case, and pressure standard that determines which firearms it safely chambers in.
Operational Profile
Browse the factory loads below to compare bullet weights, muzzle velocities, and energy figures for the 5.56x45mm NATO. Each load reflects published manufacturer specifications for this caliber. Always confirm a load is rated for your specific firearm before use.
All Factory Loads · 5.56x45mm NATO
5.56 NATO American Eagle XM855 62gr
Federal Premium
Grain62.0
Velocity3020 fps
Energy1256 ft·lb
5.56 NATO BLACK 62gr FMJ
Hornady
Grain62.0
Velocity3060 fps
Energy1289 ft·lb
5.56 NATO Frontier 75gr BTHP Match
Hornady
Grain75.0
Velocity2910 fps
Energy1410 ft·lb
5.56x45mm NATO 55gr American Eagle XM193 FMJ
Federal Premium
Grain55.0
Velocity3165 fps
Energy1222 ft·lb
5.56x45mm NATO 62gr Green Tip M855 FMJ
Winchester
Grain62.0
Velocity3100 fps
Energy1323 ft·lb
5.56x45mm NATO 62gr Tactical Bonded JSP
Federal Premium
Grain62.0
Velocity3050 fps
Energy1281 ft·lb
5.56x45mm NATO 68gr Frontier BCHP
Hornady
Grain68.0
Velocity2960 fps
Energy1322 ft·lb
5.56x45mm NATO 77gr MK262 Mod 1 OTM
Black Hills
Grain77.0
Velocity2750 fps
Energy1293 ft·lb