.375 Holland & Holland Magnum

Technical Specifications

 

Country of Origin United Kingdom
Diameter – Bore .366” (9,30mm)
Diameter – Groove .376” (9,55mm)
Introduced 1912
Pressure – Max Average 63,366 psi (448 MPa)
Regulators CIP & SAAMI
Groove Details 6 x .115” (2,92mm)
Shellholder – RCBS 4
Twist – Proof Barrel 1:12” (305mm)
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
Cartridge Essentials

 

Action Size Recommended Stretched length & standard magnum bolt face
Barrel Life 3,750 – 4,500 rounds
Case – Body Taper 1.71°
Case – Neck Length .352” (8,95mm) = 93,9%
Case – Trim Length 2.842” (72,91mm)
Parent Case Original
Relative Capacity 95.5 gr water (6,201 cc)
Shoulder Angle 14°27’€™52”
Typical Factory Load Guidelines for Africa – Solids
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 0% Expansion
Norma 350-gr Woodleigh Solid 2,300 fps 4,112 ft/lb 86.3
Federal 300-gr TB Sledgehammer 2,440 fps 3,967 ft/lb 84
Kynoch 300-gr Woodleigh Soft 2,500 fps 4,164 ft/lb 87.4
Norma 300-gr Norma Solid 2,550 fps 4,333 ft/lb 91
Nosler 300-gr Nosler Mono Solid 2,550 fps 4,333 ft/lb 91
PMP 286-gr PMP Super Solid 2,493 fps 3,948 ft/lb 82.9
Kynoch 270-gr Woodleigh Soft 2,650 fps 4,211 ft/lb 88.4
Kynoch 235-gr Woodleigh Solid 2,800 fps 4,092 ft/lb 85.9
Typical Factory Load Guidelines for Africa – Expanders
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Norma 350-gr Woodleigh Solid 2,300 fps 4,112 ft/lb 43.2
Federal 300-gr Federal P-Shok 2,530 fps 4,265 ft/lb 44.8
Federal 300-gr Barnes TSX 2,470 fps 4,065 ft/lb 42.7
Federal 300-gr Swift A-Frame 2,450 fps 4,000 ft/lb 42
Federal 300-gr Federal Fusion 2,440 fps 3,967 ft/lb 41.6
Federal 300-gr Nosler Partition 2,440 fps 3,967 ft/lb 41.6
Federal 300-gr TB Bear Claw 2,600 fps 4,504 ft/lb 47.3
Kynoch 300-gr Woodleigh Soft 2,500 fps 4,164 ft/lb 43.7
Norma 300-gr Norma Oryx 2,559 fps 4,363 ft/lb 45.8
Norma 300-gr Swift A-Frame 2,559 fps 4,363 ft/lb 45.8
Nosler 300-gr Nosler Partition 2,450 fps 4,000 ft/lb 42
Nosler 300-gr Accubond 2,400 fps 3,838 ft/lb 40.3
PMP 300-gr PMP Soft 2,428 fps 3,928 ft/lb 41.2
PMP AE 300-gr Swift A-Frame 2,392 fps 3,812 ft/lb 40
Federal 270-gr Federal P-Shok 2,690 fps 4,339 ft/lb 45.6
Kynoch 270-gr Woodleigh Soft 2,650 fps 4,211 ft/lb 44.2
Norma 270-gr Barnes TSX 2,625 fps 4,132 ft/lb 43.4
Nosler 260-gr Nosler Accubond 2,750 fps 4,367 ft/lb 45.8
Federal 250-gr TB Bear Claw 2,670 fps 3,958 ft/lb 41.6
Kynoch 235-gr Woodleigh Soft 2,800 fps 4,092 ft/lb 43
Optimum Game Bullet Optimum Application Bands (300-gr averaged)
Band Velocity Parameters Start End
Red-Band ( > 2,600 fps) 0 yds ±0 yds
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 0 yds ± 175 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 175 yds ± 300 yds
Bullet Recommendations for Africa
Big game          Fifth generation, sixth generation and seventh generation bullets
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
African Game Weight Recommendation
≤ 3,300-lb ( ≤ 1,500-kg)
Most Suitable African (assuming legality)
Big Game         Buffalo, Lord Derby eland, giraffe, hippo, lion, rhino. It is suitable for but there are better
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Semi critical > 3.75” (95mm)
Exit Pupil ≥ 5mm
Magnification: Red-Band = 1x
Magnification: Green-Band = 1x – ≤ 4x
Magnification: Amber-Band ≥ 6x – ≤7x
Objective Lens ≥ 20mm – ≤ 30mm
Parallax Adjustability No
Reticules Dangerous Game. Bold posts. German #1, #2, #4, #9, #56
Consider illuminated dots
Plains Game. Medium post duplex
Handloading Guidelines
Load Development 1.0 grain increments
Primer Large Rifle Magnum
Propellant Range Medium-burning rifle: ≥ IMR-3031 – ≤ IMR-4007
Full length resize for dangerous game hunting
Check feeding before
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt