IGMAN 223 Rem 55gr, Ammo, FMJ, 20rd Box
This item listing is for a single box of 20rds of IGMAN .223 Remington. This can be used in guns marked 5.56 and 223 Rem. Excellent for AR-15 Rifles and AR-15 Pistols.
1 box of 20rds
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MANUFACTURER NUMBER:IGGMAN223A20CALIBER:223 RemingtonROUNDS:20PRICE-PER-ROUND:$0.75 – $0.99UNIT OF MEASURE:BoxCLASSIFICATION:AmmunitionINTERESTS:Top Sellers, Top Ammo, Trending Now
The 223 Remington has a 28.8-grain H2O (1.87 ml) cartridge case capacity.8
223 Remington maximum CIP cartridge dimensions. All sizes in millimeters (mm).4
Americans would define the shoulder angle at alpha/2 = 23 degrees. The common rifling twist rate for this cartridge is 305 mm (1 in 12 in), 6 grooves, Ø lands = 5.56 millimetres (0.219 in), Ø grooves = 5.69 millimetres (0.224 in), land width = 1.88 millimetres (0.074 in) and the primer type is small rifle.
According to the official CIP rulings, the 223 Remington can handle up to 430.00 MPa (62,366 psi) Pmax piezo pressure. In CIP-regulated countries, every rifle cartridge combination has to be proofed at 125% of this maximum CIP pressure to certify for sale to consumers.4
This means that 223 Remington chambered arms in CIP-regulated countries are currently (2016) proof tested at 537.50 MPa (77,958 psi) PE piezo pressure. This is equal to the NATO maximum service pressure guideline for the 5.56×45mm NATO cartridge.
The SAAMI pressure limit for the 223 Remington is set at 379.212 MPa (55,000 psi), piezo pressure.910 Remington submitted 223 Remington specifications to SAAMI in 1964.5 The original diagrams use English Inch measurements.
The external dimensional specifications of 223 Remington and 5.56×45mm NATO brass cases are nearly identical. The cases tend to have similar case capacity when measured (case capacities have been observed to vary by as much as 2.6 grains (0.17 ml),
although the shoulder profile and neck length are not the same and 5.56×45mm NATO cartridge cases tend be slightly thicker to accommodate higher chamber pressures.
When handloaded, care is taken to look for pressure signs as 5.56×45mm NATO cases may produce higher pressures with the same type of powder and bullet as compared to 223 Remington cases. Sierra provides separate loading sections for 223 Remington and 5.56×45mm NATO and also recommends different loads for bolt-action rifles as compared to semiautomatic rifles.811
The table contains some estimated pressures based on normal proofing practice and on the known increases in pressure caused by bullet setback (which is a similar occurrence with regard to pressure). The proof pressure of M197 is 70,000 psi.18
The following table shows the differences in nomenclature, rifling, throating, and normal, maximum, and safe pressures:57
|Cartridge||US designation||NATO designation||Bullet||Rifling||Throat||Pressure in NATO chamber||in 223 SAAMI chamber||Safe sustained|
|223 Remington||223 Rem||55gr FMJ||1:14||tight||52,000 psi (359 MPa)||52,000 psi (359 MPa)||Yes|
|223 Remington||M193||5.56×45mm||55gr FMJ||1:12||tight||55,000 psi (379 MPa)||55,000 psi (379 MPa)||Yes|
|223 Remington||M197||C10524197-56-2||1:12||tight||70,000 psi (483 MPa)||70,000 psi (483 MPa)||One time only|
|5.56×45 mm NATO||M855||SS109||62 gr ball||1:7||long||62,366 psi (430 MPa) EPVAT||over 70,000 psi (483 MPa)||No|
|5.56×45 mm NATO||M856||L110||77gr Tracer||1:7||long||62,366 psi (430 MPa) EPVAT||over 70,000 psi (483 MPa)||No|
|5.56×45 mm NATO||M857||SS111||Tungsten carbide||1:7||long||62,366 psi (430 MPa) EPVAT||over 70,000 psi (483 MPa)||No|
|5.56×45 mm NATO||Proof||Proof||unknown||1:7||long||77,958 psi (538 MPa) EPVAT||82,250 psi (567 MPa) estimated|
Beside the NATO EPVAT testing pressure testing protocols the other employed peak pressure measurement methodology or methodologies to correlate this table remain unknown.
- 223 Remington Cartridge Guide by AccurateShooter.com
- A 5.56×45mm Timeline by Daniel Watters
- Ballistics By The Inch 223 Remington results.
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