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1000 Rounds of 5.56x45 Ammo by Winchester USA - 62gr FMJ M855
1000 Rounds of 5.56x45 Ammo by Winchester USA - 62gr FMJ M855 - Image 2
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1000 Rounds of 5.56×45 Ammo by Winchester USA – 62gr FMJ M855

Ammo Quantity – 1,000 rounds per case
Ammo Manufacturer – Winchester
Projectiles – 62 grain full metal jacket (FMJ) M855
Ammo Casings – Boxer-primed brass
Muzzle Velocity – 3,060 fps
Muzzle Energy – 1,289 ft lbs
In general there are two kinds of magnetic bullets. The first only includes steel because it’s cheaper than copper. The second actually puts its steel to work to promote better penetration through sheet metal. This 5.56×45 ammo by Winchester features the latter kind of bullet.

An M855 round’s 62 grain bullet performs identically to an FMJ until it makes contact with something. If it hits steel plating within about 300 yards, the seven grain steel tip beneath its jacket facilitates clean perforation. If it hits soft tissue, that same tip promotes penetration up to a depth of 20”.

This ammo’s green-tipped bullets are loaded in new production brass cases. The cases are only gray around their necks and shoulders because they have been annealed, i.e. heat-treated to help them expand and reduce fouling within the action during ignition. Winchester’s consistent primers and propellant charges deliver satisfying target grade accuracy – just take note that a 62 grain bullet performs most accurately in conjunction with a 1:8 or 1:9 twist barrel.

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