.500 Jeffery / 12.7x70mm Schüler

Technical Specifications

 

Country of Origin United Kingdom
Diameter – Bore .500” (12,70mm)
Diameter – Groove .510” (12,95mm)
Introduced 1927/28
Pressure – Max Average 47,862 psi (330 MPa)
Regulators CIP
Groove Details 6 x .175” (4,45mm)
Shellholder – RCBS custom
Twist – Proof Barrel 1:20” (508mm)
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
Cartridge Essentials

 

Action Size Recommended Magnum length, .75” diameter bolt shaft with Jeffery face
Barrel Life 6,000 – 6,500 rounds
Case – Body Taper 0.32°
Case – Neck Length .328” (8,33mm) = 64.3%
Case – Trim Length 2.742” (69,65mm)
Parent Case Original
Relative Capacity 154.2 gr water (10,012cc)
Shoulder Angle 12°36’51”
Typical Factory Load Guidelines for Africa – Solids
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 0% Expansion
Norma 570-gr Woodleigh Solid 2,200 fps 6,127 ft/lb 94.6
Nosler 570-gr Nosler Solid 2,300 fps 6,697 ft/lb 103.4
Norma 540-gr Norma Mono Solid 2,400 fps 6,908 ft/lb 106.7
Kynoch 535-gr Woodleigh Solid 2,400 fps 6,844 fp/lb 105.7
Typical Factory Load Guidelines for Africa – Expanders
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Norma 570-gr Woodleigh RN-SP 2,200 fps 6,127 ft/lb 47.3
Kynoch 535-gr Woodleigh RN-SP 2,400 fps 6,844 ft/lb 52.8
W Romey 535-gr unknown
Optimum Game Bullet Optimum Application Bands (525-gr averaged)
Band Velocity Parameters Start End
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 0 yds ± 50 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 50 yds ± 150 yds
* Read all about this cartridge in the book African Dangerous Game Cartridges by Pierre van der Walt
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)
Pachederms , elephant, hippo (body shots),
* 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
Handloading Guidelines
Load Development 1.0 grain increments
Primer Federal 215 Large Rifle Magnum
Propellant Range Medium-burning to faster Slow-burning rifle: ≥ IMR-3031 – ≤ IMR-4350
Use Lee factory crimp die to crimp bullets with no shoulder damage
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