223 (5.56) Ammo

.223 Remington ammunition and 5.56x45 NATO are closely related and sometimes interchangeable cartridges depending on the firearm they are to be used with. Manufacturers typically offer guidance on this point. In general, the 5.56 NATO ammunition the military uses and is for sale to the civilian market operates at higher pressures than .223 Remington ammo. Most, but not all, AR-15s are chambered for 5.56 NATO and can fire both types of ammo.

Many loads in both calibers follow the M193 or M855 standard, both of which are military specifications. M193 ammo typically fires a 55 grain full metal jacket bullet at 3,240 feet per second, while M855 ammo fires a heavier 62 grain FMJ bullet at about 3,100 feet per second. These common standards are very helpful when sighting in your optics and you'll find both cartridges in-stock and available in cheap bulk packs here at Widener's

Certain specialized loads deviate from these common standards. Competition grade .223/5.56 ammo fires a heavier bullet (most commonly a Sierra MatchKing) in the 77 grain range to provide better stability and more predictable trajectories; varmint loads, on the other hand, fire light 30-40 grain bullets at very high velocities to produce lethal fragmentation against pest animals.

One of the most sought after range loads for this caliber is Lake City ammunition, which is produced by Federal Premium Ammunition at the Lake City Army Ammunition Plant in Independence, Missouri. LCAAP production is typically excess from government contracts and is popular due to its military origins and high quality.

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  1. Remington Premier Match Sierra MatchKing 223 Rem 77 Grain HP-BT – 20 Rounds

    $27.85

    In stock

    Manufacturer Remington
    Condition New
    Bullet Weight 77 Grain
    Bullet Type Hollow-Point Boat Tail (HP-BT)
    Use Type match or precision shooting, varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU RM223R3
    Primer Type Boxer
    Magnetic No
    UPC Barcode 047700391304
    Cost Per Round $1.39 per round

    This is a great round for match or precision shooting, varmint hunting. From Remington, this 223 Remington ammunition is New with a Hollow-Point Boat Tail (HP-BT) 77 Grain bullet. You'll get 20 rounds of Brass cased ammo that's ready for your next trip out to shoot. Like every round for sale, we stand behind this ammo and have your back so rest assured you're not only getting a good deal, you're getting the peace of mind that comes along with a trusted supplier.

  2. Hornady Non-Toxic 223 Rem 35 Grain PT – 20 Rounds

    $27.85

    In stock

    Manufacturer Hornady
    Condition New
    Bullet Weight 35 Grain
    Bullet Type NTX
    Use Type varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU 83266
    Primer Type Boxer
    Magnetic No
    UPC Barcode 090255832662
    Cost Per Round $1.39 per round

    Developed during the Vietnam War, the 223 Rem has become one of the most popular rounds in the Western World among militaries, civilians, and law enforcement. Whatever your needs are, whether they be hunting medium game, eradicating varmints, defending your home, or competing in a shooting competition, the 223 Rem is the perfect round for you with its fantastic, low recoil, phenomenal accuracy, and amazing speed.

    Hornady has been around since the end of World War Two and has come to be one of the most innovative ammunition providers in the world, making just the high quality and effective ammo you need. These Hornady Non-Toxic, 35 grain, polymer tipped rounds fire at the incredible velocity of 4000 feet per second and produce massive expansion and have fantastic terminal performance, making these the perfect rounds for taking out even the speediest varmints out there.

  3. Winchester Varmint-X 223 Rem 55 Grain PT – 20 Rounds

    $27.85

    In stock

    Manufacturer Winchester
    Condition New
    Bullet Weight 55 Grain
    Bullet Type Polymer Tipped
    Use Type varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU X223P
    Primer Type Boxer
    UPC Barcode 020892219977
    Cost Per Round $1.39 per round

    20 rounds of Winchester 223 Remington ammo that'll have your gun firing for a while and your face smiling for even longer! The Boxer primer, 55 Grain Polymer Tipped bullet and Brass cases on these New rounds make for the perfect companion for varmint hunting. Pick up some rounds today and you'll get fast shipping along with Widener's world class service.

  4. Barnes VOR-TX 223 Rem 55 Grain Triple-Shock X Hollow Point - 20 Rounds

    $28.85

    In stock

    Manufacturer Barnes
    Condition New
    Bullet Weight 55 Grain
    Bullet Type TSX
    Use Type home defense, hunting whitetail deer, match or precision shooting, plinking at the range, varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU 21520
    Primer Type Boxer
    Magnetic No
    UPC Barcode 716876022359
    Cost Per Round $1.44 per round

    This is a great round for home defense, hunting whitetail deer, match or precision shooting, plinking at the range, varmint hunting. From Barnes, this 223 Remington ammunition is New with a TSX 55 Grain bullet. You'll get 20 rounds of Brass cased ammo that's ready for your next trip out to shoot. Like every round for sale, we stand behind this ammo and have your back so rest assured you're not only getting a good deal, you're getting the peace of mind that comes along with a trusted supplier.

  5. Winchester Super-X 223 Rem 64 Grain Power Point – 20 Rounds

    $28.85

    In stock

    Manufacturer Winchester
    Condition New
    Bullet Weight 64 Grain
    Bullet Type Power-Point (PP)
    Use Type hunting boar, hunting whitetail deer, varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU X223R2
    Primer Type Boxer
    UPC Barcode 020892202122
    Cost Per Round $1.44 per round

    When you are looking for something highly reliable and proven, the 223 Remington is just the round for you. Developed in 1964 during the war in Vietnam, this round has become more and more popular through the decades and is used all over the Western World for civilian, military, and law enforcement purposes. Whether you are looking for something for hunting, varmint exterminating, plinking around, or shooting in your next competition, the 223 Remington is perfect for you.

    Since 1866, Winchester has been providing America with some of the best ammunition in the world and still make some of the best and most reliable ammo in the world. These Winchester Super-X, 64 grain, power point, brass cased, boxer primed rounds fire at 3020 feet per second and have incredible expansion and massive expansion, helping you take out deer and even elk while saving your wallet, giving you the perfect round for all your hunting needs.

  6. Nosler Varmageddon 223 Rem 55 Grain FB Tipped – 20 Rounds

    $29.85

    In stock

    Manufacturer Nosler Ammunition
    Condition New
    Bullet Weight 55 Grain
    Bullet Type Polymer Tipped
    Use Type varmint hunting
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU 65145
    Primer Type Boxer
    Magnetic No
    UPC Barcode 054041651455
    Cost Per Round $1.49 per round

    This is a great round for varmint hunting. From Nosler Ammunition, this 223 Remington ammunition is New with a Polymer Tipped 55 Grain bullet. You'll get 20 rounds of Brass cased ammo that's ready for your next trip out to shoot. Like every round for sale, we stand behind this ammo and have your back so rest assured you're not only getting a good deal, you're getting the peace of mind that comes along with a trusted supplier.

  7. Remington Premier Match 223 Remington 69 Grain BTHP - 20 Rounds

    $29.85

    In stock

    Manufacturer Remington
    Condition New
    Bullet Weight 69 Grain
    Bullet Type Hollow-Point Boat Tail (HP-BT)
    Use Type match or precision shooting, plinking at the range
    Casing Type Brass
    Quantity 20
    Ammo Caliber 223 Remington
    Manufacturer SKU RM223R1
    Primer Type Boxer
    Magnetic No
    UPC Barcode 047700385006
    Cost Per Round $1.49 per round

    When a trophy is on the line, count on Remington Premier Match to deliver. These .223 Remington cartridges are designed to be as accurate as you are and feature Sierra MatchKing bullets. MatchKings are a favorite among many champion shooters due to their superb production quality and aerodynamic design.

    Each cartridge in this box of 20 fires a 69 grain version of the MatchKing at a muzzle velocity of 3,000 feet per second. This above-average velocity increases recoil slightly but delivers flatter trajectories and improved long-range performance in return.

    Remington Premier Match ammo is made in the USA and uses non-corrosive primers and brass cases.

  8. Black Hills 5.56x45mm 77 Grain OTM - Civilian MK262 Mod 1 - 50 Rounds

    $94.85

    In stock

    Manufacturer Black Hills Ammunition
    Condition New
    Bullet Weight 77 Grain
    Bullet Type Open Tip Match
    Use Type home defense, match or precision shooting, plinking at the range
    Casing Type Brass
    Quantity 50
    Ammo Caliber 5.56x45mm
    Manufacturer SKU D556N9
    Primer Type Boxer
    Magnetic No
    UPC Barcode 612710126408
    Cost Per Round $1.90 per round

    Of all the manufacturers of 5.56 ammo, Black Hills is one of the very best. Even supplying the US military with all of their match 5.56 ammo and special rounds for specific missions, Black Hills ammunition is manufactured to the most stringent standards. If you want a high quality, military grade round, Black Hills is the way to go.

    These civilian versions of the "MK262 Mod 1" 77 grain open tip match, or OTM, rounds are perfect for range training (they differ only from the military version of the round due to a slightly different powder and primer). With much more mass than the standard 5.56x45mm range round, you don't have to worry as much about wind interference, helping to increase your accuracy. These are some of the best training rounds on the market.

    Customer Reviews

    THE SDM Ammo for taking out the trash

    This is the MK262 MOD 1 ammo used by Uncle Sam's DM's for use in 1:8" twist or faster barrels, with 556 NATO or 223 Wylde chambers. I tested a single 5-shot group from a bipod at 600yds and the elevation was a tick over 1/2MOA from a sample rifle used to train soldiers at Ft Benning.. Close enough for gov't work.

    Review by Grant (Posted on 2/18/2022)

    You get what you pay for.

    Three five shot groups, each under .750 inches at 100 yards. Best ever from my Colt LE 6920. Let the barrel cool between groups.

    Review by Gary (Posted on 11/22/2017)

51 - 58 of 58 products