.450/400 Nitro Express 3” (Jeffery)

Technical Specifications

 

Country of Origin United Kingdom
Diameter – Bore .400” (10.16mm)
Diameter – Groove .410” (10,41mm)
Introduced 1902
Pressure – Max Average 40,610 psi (280 MPa)
Regulators CIP / SAAMI
Groove Details 7 x .1400” (3,56mm)
Shellholder – RCBS Custom
Twist – Proof Barrel 1:15” (380mm)
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
Cartridge Essentials

 

Action Size Recommended Double or Falling block
Barrel Life 7,000 – 7,500 rounds
Case – Body Taper 0.76°
Case – Neck Length .6000” (15,24mm) = 146.34%
Case – Trim Length 2.992” (76,00mm)
Parent Case .450/400 Magnum NE 3¼”
Relative Capacity 115.0 gr water (7,467cc)
Shoulder Angle 7°35’14”
Typical Factory Load Guidelines for Africa – Solids
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 0% Expansion
Hornady 400-gr Hornady DGS 2,050 fps 3,732 ft/lb 71.7
*Handloads achieve 2,125 fps
Typical Factory Load Guidelines for Africa – Expanders
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Hornady 400-gr Hornady DGS 2,050 fps 3,732 ft/lb 35.9
*Handloads achieve 2,125 fps
Optimum Game Bullet Optimum Application Bands (400-gr averaged)
Band Velocity Parameters Start End
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 0 yds ± 0 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 0 yds ± 75 yds
Bullet Recommendations for Africa
All species        Solids. On pachyderms use flat nose monometal solids
African Game Weight Recommendation
≤ 13,000-lb ( ≤ 6000-kg)
Most Suitable African Species (assuming legality)
Pachederms     Buffalo, elephant, hippo (body shots), rhino
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Critical ≥ 4.0″
Exit Pupil ≤ 5mm
Magnification: Amber-Band ≥ 1x
Objective Lens ≥ 20mm – ≤ 24 mm
Parallax Adjustability No
Reticules Bold posts. German #1, #2, #4, #9, #56
Consider illuminated dots
Consider reflex sights
Handloading Guidelines
Load Development 1.0 grain increments
Primer Any Large Rifle Magnum
Propellant Range Slower medium-burning to faster slow-burning rifle: ≥ IMR-4007 – ≤ Hodgdon H-4350
Tips Use Lee factory crimp die to crimp bullets with no shoulder damage
Full length resize hunting loads
Check feeding before hunt
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt