.450 Rigby Rimless Magnum

Technical Specifications

 

Country of Origin United States
Diameter – Bore .450” (11,43mm)
Diameter – Groove .458” (11,63mm)
Introduced 1994
Pressure – Max Average 58,016 psi (400 MPa)
Regulators CIP
Groove Details 6 x .015” (3,60mm)
Shellholder – RCBS 37
Twist – Proof Barrel 1:16.53” (420mm)
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
Cartridge Essentials

 

Action Size Recommended Miniature length & .223 bolt face
Barrel Life 6,500 – 7,500 rounds
Case – Taper .47°
Case – Neck Length .5043” (12,81mm) = 110.1%
Case – Trim Length 2.886” (73,30mm)
Parent Case .416 Rigby
Relative Capacity 133 gr water (8,636 cc)
Shoulder Angle 40°2’30”
Typical Factory Load Guidelines for Africa – Solids
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 0% Expansion
Norma 550-gr PH Solid 2,100 fps 5,387 ft/lb 92.6
Norma 500-gr Norma Mono Solid 2,500 fps 6,941 ft/lb 119.3
Kynoch 480-gr Woodleigh RN Solid 2,378 fps 6,029 ft/lb 94.0
Typical Factory Load Guidelines for Africa – Expanders
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Norma 550-gr African PH Soft 2,100 fps 5,387 ft/lb 46.3
Kynoch 480-gr Woodleigh RN-SP 2,378 fps 6,029 ft/lb 47.0
Optimum Game Bullet Optimum Application Bands (averaged)
Band Velocity Parameters Start End
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 0 yds ± 100 yds
Bullet Recommendations for Africa
All Solids. On pachyderms use flat nose monometal solids
African Game Weight Recommendation
≤ 13,000-lb ( ≤ 6000-kg)
Most Suitable African Species (assuming legality)
Pachyderms      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 Medium-burning rifle: ≥ IMR-8208 – ≤ Hodgdon H-4895
Use normal taper crimp. Can augment with Lee factory crimp
Use foam filler to improve combustion consistency
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