.223 Remington / 5,6 x 45mm NATO

Technical Specifications

 

Country of Origin United States
Diameter – Bore .219” (5,56mm)
Diameter – Groove .224” (5,69mm)
Introduced 1964
Pressure – Max Average 55,000 psi (379 MPa)
Regulators SAAMI & CIP
Groove Details 6 x 0.074” (1,88mm)
Shellholder – RCBS 10
Twist – Proof Barrel 1:12€” (305mm) (1:8”€ recommended for hunting)
Cartridge Essentials

 

Action Size Recommended Miniature & .223 bolt face
Barrel Life 4,500 – 5,200 rounds
Case – Body Taper 0.99°
Case – Neck Length .2027” (5,15mm) = 90.5%
Case – Trim Length 1.752” (44,50mm)
Parent Case .222 Remington stretched
Relative Capacity 28.8 gr water (1,870 cc)
Shoulder Angle 23°
Typical Factory Load Guidelines for Africa (Antelope)
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Federal 64-gr Federal Power Shok 3,050 fps 1,322 ft/lb 23.2
Winchester 64-gr Power Max Bonded 3,090 fps 1,357 ft/lb 23.9
Federal 62-gr Federal Fusion 3,000 fps 1,239 ft/lb 21.8
Barnes 55-gr Barnes Vor-Tx TSX 3,240 fps 1,282 ft/lb 22.5
Remington 55-gr Remington Accutip 3,240 fps 1,282 ft/lb 22.5
Ultramax 55-gr Nosler Ballistic Tip 3,000 fps 1,099 ft/lb 19.3
Bullet Recommendations for Africa
Varmints Frangible
Antelope Fifth (bonded core), sixth (typical monometal) or seventh generation (bi-metal expanding) bullets.
African Game Weight Recommendation
≤ 75-lb (≤ 35-kg)
Most Suitable African Species (assuming legality)
Varmints : Aardwolf, civet, honey badger, black-back jackal, side-striped jackal, vervet monkey, otter, serval  and the wild dog
Cats : Caracal (lynx)
Antelope : Common duiker, red duiker, grey rhebok, Cape grysbok, Sharpe’€™s grysbok, klipspringer, oribi and steenbok. Given premium bullets and proper shot placement it can be stretched for use on antbear, blesbok, bontebok, brown hyena, Arabian oryx, springbok, common reedbuck and impala. There are way more suitable cartridges for the latter species though.
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Non critical
Exit Pupil ≥ 2,5mm
Magnification: Red-Band ≥ 7x
Magnification: Green-Band ≥ 12x – ≤ 14x
Magnification: Amber-Band ≥ 16x – ≤ 18x
Objective Lens ≥ 48mm – ≤ 56mm
Parallax Adjustability Yes
Reticules Very fine with reference bars
Handloading Guidelines
Load Development 0.5 grain increments
Primer Standard (Match) Large Rifle
Propellant 60-gr: Medium-burning rifle: ≥ IMR-4895 to ≤ IMR-4350
55-gr: Medium-burning rifle: ≥ IMR-8208 to ≤ IMR-4007
50-gr: Medium-burning rifle: ≥ IMR-8208 to ≤ IMR-4007
Tips Follow precision handloading steps