22.3 C
Paris
Friday, July 28, 2017

7 x 64mm Brenneke

Technical Specifications

 

Country of Origin Germany
Diameter – Bore 0.2750” (6,98 mm)
Diameter – Groove 0.2850” (7,24 mm)
Introduced 1917
Pressure – Max Average 60,191 psi (415 MPa)
Regulators CIP
Groove Details 4 x 0.1457” (3,70 mm)
Shellholder – RCBS 3
Twist – Proof Barrel 1:8.66” (1:220 mm)
Cartridge Essentials

 

Action Size Recommended Standard length & standard bolt face
Barrel Life 3,400 – 3,850 rounds
Case – Body Taper 1.17°
Case – Neck Length .3398” (8,63mm) = 119,6%
Case – Trim Length 2.512” (63,8 mm)
Parent Case Original – 280 Rem useable
Relative Capacity 69.0 gr water (4,480 cc)
Shoulder Angle 20°12’52”
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt
Typical Factory Load Guidelines for Africa
Brand Name Bullet Weight Bullet Description Velocity Fps Energy Ft/Lb Trauma Potential 100% Expansion
Sellier & Bellot 175-gr Nosler Partition 2,569 fps 2,565 ft/lb 35.6
Sellier & Bellot 175-gr Sierra GameKing 2,523 fps 2,474 ft/lb 34.3
Sellier & Bellot 173-gr S&B SPCE 2,526 fps 2,452 ft/lb 34
Norma 170-gr Norma Oryx 2,756 fps 2,868 ft/lb 39.8
Norma 170-gr Norma Plastic Point 2,723 fps 2,800 ft/lb 38.8
Norma 170-gr Norma Vulkan 2,723 fps 2,800 ft/lb 38.8
PMP 170-gr ProAm 2,625 fps 2,602 ft/lb 36.1
Sellier & Bellot 162-gr S&B PTS 2,625 fps 2,479 ft/lb 34.4
Sellier & Bellot 158-gr S&B HPC 2,638 fps 2,442 ft/lb 33.9
Sellier & Bellot 158-gr S&B XRG 2,615 fps 2,400 ft/lb 33.3
Norma 156-gr Norma Oryx 2,789 fps 2,695 ft/lb 37.4
PMP 150-gr ProAm 2,820 fps 2,649 ft/lb 36.7
Hornady 140-gr Hornady GMX 3,117 fps 3,021 ft/lb 41.9
Norma 140-gr Nosler Accubond 2,953 fps 2,712 ft/lb 37.6
Norma 125-gr Norma Kalahari 3,115 fps 1,940 ft/lb* 26.9*
* This assumes a 25% weight loss upon impact.
Optimum Game Bullet Optimum Application Bands (160-gr averaged)
Band Velocity Parameters Start End
Red-Band ( > 2,600 fps) 0 yds ± 150 yds
Green-Band ( ≤ 2,600 fps – ≥ 2,200 fps) ± 150 yds ± 400 yds
Amber-Band ( ≤ 2,200 fps – ≥ 2,000 fps) ± 400 yds ± 530 yds
Bullet Recommendations for Africa
Plains Game Premium fourth generation 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
≤ 550-lb (≤ 250-kg)
Most Suitable African Species (assuming legality)
Plains Game Addax, black wildebeest, gemsbok, hartebeest, lechwe, nyala, sable, scimitar horned oryx, sitatunga and tsessebe
* Read all about these animals in the book Game Animals of the World by Chris & Tilde Stuart
Optics Guidelines
Eye Relief Non critical
Exit Pupil ≤ 3mm
Magnification: Red-Band ≥ 4x
Magnification: Green-Band ≥ 9x – ≤ 14x
Magnification: Amber-Band ≥ 14x – ≤ 20x
Objective Lens ≥ 44mm – ≤ 50mm
Parallax Adjustability No
Reticules Fine reticule with range references
Handloading Guidelines
Load Development 0.5 grain increments
Primer Standard Large Rifle
Propellant Range ≥160-gr: Slower end of Slow-burning rifle: ≥ Hogdon H-414 – Hodgdon H-4831
160-gr: Faster Slow -burning rifle: ≥ IMR-4007 – Hodgdon H-380
Tips None
* Read all about this cartridge in the book African Medium Bore Cartridges by Pierre van der Walt