Winchester 5.56 Ammo
(20)
Winchester 5.56mm 55gr FMJ Ammunition 20-Rounds
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$9.56
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29
(7)
Winchester Ammunition 55 gr Full Metal Jacket 5.56 Ammo, 1000/box - WM1931000
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
1000
Finish Per Color:
Brass
Grains:
55 grain
(20)
Winchester M855 62 gr Green Tip FMJ 5.56x45mm Ammunition 150 Rounds - WM855150
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
150
Finish Per Color:
Brass
Grains:
62 grain
From:
$81.99
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18
(16)
Winchester USA RIFLE, 5.56x45mm NATO, 55 grain, Full Metal Jacket, Brass, Centerfire Rifle Ammo, 200, WM193200
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
200
Finish Per Color:
Brass
Grains:
55 grain
(7)
USA SERVICE GRADE 5.56MM NATO AMMO - 105-004-477WB 5.56MM NATO 55GR FULL METAL JACKET 20/BOX
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$8.99
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19
(7)
Winchester M855 5.56 Ammo 62 Grain FMJ 500 Rds - WM855500
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
500
Finish Per Color:
Brass
Grains:
62 grain
(4)
Winchester USA Valor 5.56mm NATO 62gr FMJ Rifle Ammo - 125 Rounds
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
125
Finish Per Color:
Brass
Grains:
62 grain
From:
$81.28
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17
(20)
Winchester M855 62 gr FMJ Green Tip 5.56x45mm Ammunition 200 Rounds - WM855200
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
200
Finish Per Color:
Brass
Grains:
62 grain
From:
$99.99
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15
(1)
Winchester USA Valor M193 55 gr FMJ 5.56 Ammunition, 125 Rounds - USA193125
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
125
Finish Per Color:
Brass
Grains:
55 grain
From:
$66.25
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16
(7)
Winchester M855 62 gr FMJ 5.56x45mm Ammunition 1000 Rounds - WM8551000
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
1000
Finish Per Color:
Brass
Grains:
62 grain
(3)
Winchester USA Green Tip 62 gr FMJ M855 5.56x45 Ammunition, 420 Rounds - WM855420CS
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
420
Finish Per Color:
Brass
Grains:
62 grain
(0)
Winchester 62 gr FMJ 5.56 Ammunition, 20 Rounds - USA5562
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
62 grain
From:
$11.99
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16
(0)
Winchester USA Clip Pack M855 62 gr FMJ 5.56x45 Ammunition, 30 Rounds on Clip - WM855CP
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
30
Finish Per Color:
Brass
Grains:
62 grain
From:
$24.99
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15
(0)
Winchester 55 gr FMJ M193 5.56x45 Ammunition, 30 Rounds On Stripper Clips - WM193CP
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
55 grain
From:
$22.42
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14
(0)
5.56x45 - 55 Grain FMJ - Winchester USA - 800 Rounds
Brand:
Winchester
Bullet Type:
Full Metal Jacket
Caliber:
5.56×45mm NATO
Capacity:
800
Finish Per Color:
Brass
Grains:
55 grain
(0)
Winchester Ammo WW556CL 5.56 NATO 55 GR Full Metal Jacket FMJ 300rd Can
Brand:
Winchester
Bullet Type:
Full Metal Jacket (FMJ)
Caliber:
5.56×45mm NATO
Capacity:
300
Finish Per Color:
Brass
Grains:
55 grain
(1)
Winchester 5.56mm 77gr BTHP Match Ammunition, 20 Round Box - S556M
Brand:
Winchester
Bullet Type:
SIERRA MATCHKING BOAT TAIL HOLLOW POINT (BTHP)
Caliber:
5.56×45mm NATO
Capacity:
20
Finish Per Color:
Brass
Grains:
77 grain
From:
$23.99
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13
(5)
USA 5.56MM NATO AMMO - 105-004-682WB 5.56MM NATO 55GR FULL METAL JACKET M193 14,000/DRUM
Brand:
Winchester
Caliber:
5.56×45mm NATO
Rounds:
14000
(0)
Winchester USA M855 Green Tip Rifle Ammunition 5.56mm 62gr FMJ 3060 fps 30/ct (Stripper Clips)
Brand:
Winchester
Caliber:
5.56×45mm NATO
Rounds:
30
(0)
Winchester USA Lake City M855 Rifle Ammunition 5.56mm 62gr FMJ 1255 fps 1000/ct
Brand:
Winchester
Caliber:
5.56×45mm NATO
Rounds:
1000
(0)
Winchester Lake City M855 Rifle Ammunition 5.56mm 62gr FMJ 1255 fps 600/ct Case of 4-150 Boxes, WM855150C
Brand:
Winchester
Caliber:
5.56×45mm NATO
Rounds:
600
(0)
Winchester Lake City M193 Rifle Ammo 5.56mm 55gr FMJ 3240 fps 1000/ct case, WM193KC
Brand:
Winchester
Bullet Type:
FMJ
Caliber:
5.56×45mm NATO
Capacity:
1000
Finish Per Color:
Brass
Rounds:
1000
(0)
Winchester Lake City M193 Rifle Ammo 5.56mm 55gr FMJ 3240 fps 1000/ct Bulk, WM193BK
Brand:
Winchester
Bullet Type:
Full Metal Jacket (FMJ)
Caliber:
5.56×45mm NATO
Grains:
55 grain
Rounds:
1000
(0)
Winchester Lake City 5.56mm M855 Green Tip 62gr FMJ 4-200 RD Boxes 800 RD Case, WM855200C
Brand:
Winchester
Caliber:
5.56×45mm NATO
Rounds:
800
Marketplace Insights
★ 4.6/5
based on 150 customer reviews across 37 variants from 38 retailers
Highly reliable Winchester 5.56 ammo with strong accuracy and fast shipping, though some buyers report cosmetic damage and confusion about reloading status at premium current prices.
What customers like
Reliability & Function58%
No FTF or FTE. Simple and goes bang. Definitely recommend.
Accuracy Performance38%
surprisingly accurate and is does not foul up my barrel as much
Good Value/Price32%
Good ammo for the price, it was shipped Very fast
Fast Shipping21%
shipped promptly to my local FFL shop, will definitely do more business
Winchester Brand Trust15%
Winchester quality and performance at a good price
Common concerns
Dented/Damaged Casings14%
quite a few dented shell casings, but if they were in the mix
Reloaded vs New Confusion13%
This is reloaded brass and many of the casings have dings
Short Quantity Issues6%
The box contained 199 rounds instead of 200
High Current Pricing6%
prices are ridiculous right now
Shipping Packaging Concerns5%
shipped with just a shipping label on it. Everyone knew exactly
Frequently Asked Questions
Winchester 5.56 Ammo
Does Winchester make good 5.56 ammo?
Winchester makes reliable 5.56 ammo. Their White Box line is a popular budget option for range training, offering consistent performance at a reasonable price. They produce 37 variants currently. It's not premium match-grade ammunition, but works well for general practice and plinking.
Is .223 and 5.56 ammo the same?
Not quite. Both use the same bullet diameter, but 5.56 NATO runs at higher pressure (around 58,000 psi) than .223 Remington. You can safely fire .223 in a 5.56 chamber, but not vice versa—5.56 in a .223 rifle risks dangerous overpressure.
Is Winchester 5.56 ammo dirty?
Winchester 5.56 can leave more carbon fouling than some premium loads, and the brass may appear dull compared to brands like S&B or Magtech. Neither issue affects reliability. It functions well for range training, though you may need to clean your rifle more frequently with sustained use.
What is the best grain for 556?
Best grain depends on your use. For range training and plinking, 55-grain is affordable, abundant, and delivers high velocity with minimal recoil. For longer distances, 77-grain offers better accuracy. Our marketplace stocks 37 variants across 38 retailers, typically around $106 per box, so you can compare options easily.
What is the shelf life of 5.56 ammo?
Properly stored 5.56 ammo remains functional for decades. Manufacturers conservatively recommend use within ten years, but longevity depends on storage conditions. Keep rounds cool, dry, and away from moisture and temperature swings. Poor storage can degrade ammunition within a few years.
Where is Winchester 5.56 ammo made?
Winchester 5.56 ammunition is made at facilities including the Lake City Army Ammunition Plant in Independence, Missouri, and Winchester's Oxford, Mississippi plant. Winchester's headquarters is in East Alton, Illinois, where other ammunition types are produced.
Is Winchester 556 a green tip armor piercing?
Winchester 556 White Box ammunition is not armor piercing. Standard green tip 5.56 NATO (M855) has a steel penetrator core that can pierce light steel, but it is not classified as armor piercing under federal law. Winchester's civilian 556 offerings are designed for range use and target shooting.
Can you shoot 5.56 x45 in an AR-15?
Yes, if your AR-15 is chambered in 5.56 NATO or .223 Wylde, you can safely shoot 5.56x45 ammunition. Most modern AR-15s use 5.56 NATO chambers, which handle both 5.56 and .223 Remington rounds. Check your rifle's markings to confirm the chamber type before shooting.