.300 Winchester Magnum

Technical Specifications

 

Country of Origin United States
Diameter – Bore .300” (7.62mm)
Diameter – Groove .308” (7.82mm)
Introduced 1963
Pressure – Max Average 64,000 psi (441 MPa)
Regulators SAAMI & CIP
Groove Details 6 x .1100” (2,79 mm)
Shellholder – RCBS 4
Twist – Proof Barrel 1:10.0” (1:254 mm)
* 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 1,750 – 2,300 rounds
Case – Body Taper .69°
Case – Neck Length .2639” (6,70mm) = 85.7%
Case – Trim Length 2.612” (66,34 mm)
Parent Case .300 H&H Magnum
Relative Capacity 91.5 gr water (5,941 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
PMP 220-gr Soft Point 2,625 fps 3,367 ft/lb 43.0
Federal 200-gr Vital Shok TrophyB 2,700 fps 3,238 ft/lb 41.4
Norma 200-gr Oryx 2,789 fps 3,455 ft/lb 44.2
Barnes 180-gr Vor-tx 2,960 fps 3,503 ft/lb 44.8
Federal 180-gr Vital Shok T-Copper 2,960 fps 3,503 ft/lb 44.8
Hornady 180-gr Custom SST 2,960 fps 3,503 ft/lb 44.8
Norma 180-gr Swift A-Frame 2,920 fps 3,409 ft/lb 43.6
PMP 180-gr ProAm 2,887 fps 3,332 ft/lb 42.6
Remington 180-gr Premier CorL UltraB 2,960 fps 3,503 ft/lb 44.8
Winchester 180-gr PowerMax Bonded 2,960 fps 3,503 ft/lb 44.8
Federal 165-gr Vital Shok – Partition 3,050 fps 3,409 ft/lb 43.6
Hornady 165-gr Custom SST 3,100 fps 3,522 ft/lb 45.0
Optimum Game Bullet Optimum Application Bands (180-gr averaged)
Band Velocity Parameters Start End
Red-Band ( > 2,600 fps) 0 yds ± 185 yds
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 185 yds ± 400 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 400 yds ± 525 yds

 

Bullet Recommendations for Africa
Plains Game Expanding fourth generation plus to seventh generation bullets
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt
African Game Weight Recommendation
≤ 750lb ( ≤ 350kg)
Most Suitable African Species (assuming legality)
Plains Game Cheetah, gemsbok, hartebeest, kudu, leopard, roan, sable, scimitar-horned oryx, tsessebe, waterbuck,wildebeest and zebra. Southern eland species can be hunted with it, but there are better cartridges for that amongst transition bores
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Non critical ≥ 3.25” (80mm)
Exit Pupil ≤ 3mm
Magnification: Red-Band ≥ 7x – ≤ 9x
Magnification: Green-Band ≥ 16 – ≤ 18x
Magnification: Amber-Band ≥ 20x – ≤ 24x
Objective Lens ≥ 50mm – ≤ 56 mm
Parallax Adjustability Yes
Reticules Fine duplex with bars or dots
Handloading Guidelines
Load Development 1.0 grain increments
Primer Standard or mild Magnum Large Rifle
Propellant Range Slow- to Ultra-slow rifle: ≥ Hodgdon H-4350 – ≤ Hodgdon Retumbo
Tips Use sturdy bullets; across Red-Band in particular
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt