.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 Africa
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 Game 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 heavy species. 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
* 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 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 hunt
Use Innovative Technologies Universal Belted Magnum Collet Die when chambering becomes problematic