HUNTING THE GREAT CONTINENT OF AFRICA

.338 Winchester Magnum

Technical Specifications

Country of Origin United States
Diameter – Bore .330” (8,38mm)
Diameter – Groove .338” (8,59mm)
Introduced 1958
Pressure – Max Average 64,000 psi (430 MPa)
Regulators SAAMI & CIP
Groove Details 6 x .110” (2.79mm)
Shellholder – RCBS 4
Twist – Proof Barrel 1:10”
Cartridge Essentials

 

Action Size Recommended Miniature length & .223 bolt face
Barrel Life 3,000 – 4,000 rounds
Case – Taper .69°
Case – Neck Length .3302” (8,39mm) = 97.6%
Case – Trim Length 2.492” (63,3mm)
Parent Case .458 Winchester Magnum
Relative Capacity 86.0 gr water (5,584 cc)
Shoulder Angle 25°
Typical Factory Load Guidelines for
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Federal 250-gr Vital Shok Partition 2,660 fps 3,929 ft/lb 45.8
Remington 250-gr Premier A-Frame 2,860 fps 4,542 ft/lb 52.9
Norma 230-gr Oryx 2,756 fps 3,880 ft/lb 45.2
Federal 225-gr Vital Shok Bear Claw 2,730 fps 3,724 ft/lb 43.4
Hornady 225-gr Superform Interbond 2,840 fps 4,031 ft/lb 46.9
Remington 225-gr Premier UltraBond 2,780 fps 3,862 ft/lb 45.0
Remington 225-gr Premier Swift A-Frame 2,785 fps 3,876 ft/lb 45.1
Optimum Bullet Optimum Application Bands (250-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
Large Game The 225-gr bullets are generally a bit too fast and tend to shed a lot of weight. Opt for 250-gr (or 275-gr handloaded) fifth generation bullets or seventh generation bullets when bush-range hunting heavy . A premium 275-gr factory load at a muzzle velocity of 2,500 fps will be welcomed in Africa.
African Game Weight Recommendation
≤ 3,000lb ( ≤ 1350kg)
Most Suitable African Species (assuming legality)
Large Game Blue wildebeest, eland, gemsbok, giraffe, kudu, , okapi, roan, sable, waterbuck and zebra
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Semi critical > 3.5” (90mm)
Exit Pupil ≤ 3mm
Magnification: Red-Band ≥ 2x
Magnification: Green-Band ≥ 8x – ≤9x
Magnification: Amber-Band ≥ 10x – ≤ 12x
Objective Lens ≥ 32mm – ≤ 42mm
Parallax Adjustability No
Reticules Duplex
Handloading Guidelines
Load Development 1.0 grain increments
Primer Standard Large Rifle or mil magnum
Propellant Range Slow-burning rifle: ≥ Hodgdon H-414 – ≤ IMR-7828
Tips Neck resize to headspace on the shoulder for general use
Full length resize and check feeding before
Use Innovative Technologies Universal Belted Magnum Collet when chambering becomes problematic