Technical Specifications

Country of Origin United States
Diameter – Bore .300” (7,62mm)
Diameter – Groove .308” (7,82mm)
Introduced 1906
Pressure – Max Average 60,000 psi (405 MPa)
Regulators SAAMI & CIP
Groove Details 4 x .1767” (.4488mm)
Shellholder – RCBS 3
Twist – Proof Barrel 1:10” (254mm)
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt
Cartridge Essentials
Action Size Recommended Miniature length & .223 bolt face
Barrel Life 5,000 – 6,000 rounds
Case – Body Taper .94°
Case – Neck Length .3854” (9,79mm) = 125.1%
Case – Trim Length 2.486” (63,14mm)
Parent Case Original
Relative Capacity 68.2 gr water (4,428 cc)
Shoulder Angle 17°30’
Typical Factory Load Guidelines for Africa
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Federal 220-gr Soft Point 2,410 fps 2,838 ft/lb 36.3
PMP 220-gr Soft Point 2,402 fps 2,819 ft/lb 36.0
Remington 220-gr Core Lokt 2,410 fps 2,838 ft/lb 36.3
Norma 200-gr Oryx 2,625 fps 3,061 ft/lb 39.1
Barnes 180-gr Vor-tx TTSX 2,700 fps 2,914 ft/lb 37.3
Federal 180-gr Nosler Accubond 2,700 fps 2,914 ft/lb 37.3
Hornady 180-gr Interlock 2,700 fps 2,914 ft/lb 37.3
Norma 180-gr Nosler Partition 2,700 fps 2,914 ft/lb 37.3
PMP 180-gr ProAm 2,625 fps 2,755 ft/lb 35.2
Remington 180-gr A-Frame 2,700 fps 2,914 ft/lb 37.3
Winchester 180-gr Power Point 2,700 fps 2,914 ft/lb 37.3
Optimum Game Bullet Application Bands (180-gr averaged)
Band Velocity Parameters Start End
Red-Band ( > 2,600 fps) 0 yds ± 50 yds
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 50 yds ± 275 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 275 yds ± 400 yds
Bullet Recommendations for Africa
Red-Band Fifth generation bonded core or seventh generation monometal
Green-Band High BC boattail fourth generation or fifth generation jacketed bullets
High BC six generation or seventh generation monometal bullets
Amber-Band High BC fourth generation bullets
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt
African Game Weight Recommendation
≤ 750-lb ( ≤ 350-kg)
Most Suitable African Species (assuming legality)
Antelope Blue wildebeest, gemsbok, kudu, leopard, okapi, roan, sable, waterbuck, zebra. Technically it is good enough for lion, but magnum velocity transition bore cartridges are recommended for that species. Many southern eland has been taken with it, but there are better cartridges for that species as well.
* 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 ≤ 3mm
Magnification: Red-Band ≥ 3x
Magnification: Green-Band ≥ 9x – ≤ 10x
Magnification: Amber-Band ≥ 14x – ≤ 16x
Objective Lens ≥ 40mm – ≤ 48mm
Parallax Adjustability Only for Amber-Band hunting
Reticules Duplex
Handloading Guidelines
Load Development 0.5 grain increments
Primer Standard Large Rifle
Propellant Range
≥ 180-gr: Slow-burning ≥ Hodgdon H-414 – ≤ Hodgdon H-4831
≤ 175-gr: Slow-burning ≥Alliant 2000MR – ≤ Hodgdon Superformance
≤ 150-gr: Medium-burning ≥ IMR-4895 – ≤ IMR-4007
Tips None
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt