The 7×64mm (also unofficially known as the 7×64mm Brenneke, though its designer's name was never officially added as a part of the cartridge name) is a rimless bottlenecked centerfirecartridge developed for hunting. As is customary in European cartridges, the 7 denotes the 7 mm bore diameter and the 64 denotes the 64 mm (2.5 in) case length. The 7×64mm is a popular hunting cartridge in Central Europe due to its 11.95 mm (0.470 in) case head diameter and 84 mm (3.3 in) overall length allowing it to easily be chambered in the Mauser 98bolt-action rifle that was once standard German military issue.
At the start of the 20th century the famous German gun and ammunition designer Wilhelm Brenneke (1865–1951) was experimenting with the engineering concept of lengthening and other dimensional changes regarding standard cartridge cases like the M/88 cartridge case, then used by the German military in their Mauser Gewehr 98 rifles, to obtain extra muzzle velocity.
In 1912, Brenneke designed the commercially rather unsuccessful 8×64mm S cartridge (again in production since 2001). It was intended as a ballistic upgrade option for the Mauser Gewehr 98 rifles that were standard issue in the German military. The German military chose, however, to stay with their 8×57mm IS rifle cartridge avoiding rechambering their service rifles for a cartridge that, due to its more favourable bore area to case volume ratio, would ballistically outperform the .30-06 Springfield cartridge of the United States Army. Brenneke’s engineering concept was to create new, very powerful (for the era) cartridges by enlarging exterior cartridge case dimensions like overall length and slightly larger case head diameter compared to the German 8×57mm IS military cartridge case, coupled with an increase in maximum pressure. The concept was essentially sound, and he persisted in the development of new cartridges along this line.
In 1917 Brenneke necked down his 8×64mm S design of 1912 to 7 mm calibre, introduced it as the 7×64mm, and achieved major commercial success. The 7×64mm offered 10-12% more muzzle velocity than the 7×57mm Mauser. This results in a flatter trajectory and better performance at longer range. In the years between World War I and World War II, the 7×64mm was often regarded by German hunters as a "miracle cartridge", and dozens of different factory loads were available on the German market. It was so highly regarded that the Nazi German Wehrmacht, during the 1930s, even considered replacing the 8×57mm IS in favour of the 7×64mm for their snipers. The Wehrmacht decided — just like the German Army had in 1912 — to stay with the 8×57mm IS cartridges for their Mauser Karabiner 98ks to keep logistics as simple as possible.
Besides the 7×64mm rifle cartridge, Brenneke also designed a rimmed version for break action rifles such as double rifles and combination rifles, as well as for single shot rifles in 1917. The rimmed 7×65mmR variant of the cartridge was also immediately a commercial success.[3]
In countries where military service cartridges are banned for civil ownership, the 7×64 Brenneke is a successful cartridge for hunting and marksmanship.
Cartridge dimensions
The 7×64mm has a 4.48 ml (69 grain H2O) cartridge case capacity. A sign of the era in which the 7×64mm was developed is the gently sloped shoulders. The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt-action rifles, under extreme conditions.
7x64mm maximum C.I.P. cartridge dimensions. All sizes in millimeters (mm).
Americans would define the shoulder angle at alpha/2 ≈ 20.42 degrees. The common riflingtwist rate for this cartridge is 220 mm (1 in 8.66 in), 4 grooves, Ø lands = 6.98 mm, Ø grooves = 7.24 mm, land width = 3.70 mm and the primer type is large rifle or large rifle magnum depending on the load.
According to the official C.I.P. (Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives) rulings the 7×64mm Mauser can handle up to 415.00 MPa (60,191 psi) Pmax piezo pressure. In C.I.P. regulated countries every rifle cartridge combination has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 7×64mm Mauser chambered arms in C.I.P. regulated countries were, as of 2014, proof tested at 519.00 MPa (75,275 psi) PE piezo pressure.[4]
The SAAMI maximum average pressure (MAP) for this cartridge is 55,000 psi (379.21 MPa) piezo pressure.[5]
The American .280 Remington cartridge is probably the closest ballistic twin of the 7×64mm. When compared to the 7×64mm, the .280 Remington has a slightly lower maximum allowed chamber pressure and as an American 7 mm cartridge has a slightly smaller groove diameter. European 7 mm cartridges all have 7.24 mm (0.285 in) grooves Ø diameter.[6] American 7mm cartridges have 7.21 mm (0.284 in) grooves Ø.
Contemporary use
The 7×64mm is one of the favoured rifle cartridges in Central Europe, and is offered as a chambering option in every major European hunting rifle manufacturer's product palette. The versatility of the 7×64mm for hunting all kinds of European game and the availability of numerous factory loads all attribute to the 7×64mm chambering's popularity.[7] Loaded with short, light bullets, it can be used on small European game like fox and geese or medium game such as roe deer and chamois. Loaded with long, heavy bullets, it can be used on big European game like boar, red deer, moose and brown bear. The 7×64mm offers very good penetrating ability due to a fast twist rate that enables it to fire long, heavy bullets with a high sectional density. The 7×64mm's rimmed sister cartridge, the 7×65mmR, is also very popular in Central Europe for the same reasons as the 7×64mm. The legal banning of ex-military service cartridges like the .308 Winchester, 7×57mm Mauser, 8×57mm I, 8×57mm IS and the .30-06 Springfield in countries like France and Belgium also promoted acceptance and use of the 7×64mm and the 7×65mmR.
^The RWS Ammunition Ballistic Data & Application Consultant shows several 7x64mm factory loads 2009-08-31 at the Wayback Machine
C.I.P. CD-ROM edition 2003
C.I.P. decisions, texts and tables ()
External links
Wikimedia Commons has media related to 7 x 64 mm cartridges.
Homepage of the Brenneke Company
The 7x64 Brenneke" by Chuck Hawks
7 X 64 BRENNEKE" at Accurate Reloading
7x64 Brenneke cartridge dimensions" at Steves Pages
C.I.P. TDCC sheet 7 x 64
January 08, 2023
64mm, also, unofficially, known, brenneke, though, designer, name, never, officially, added, part, cartridge, name, rimless, bottlenecked, centerfire, cartridge, developed, hunting, customary, european, cartridges, denotes, bore, diameter, denotes, case, lengt. The 7 64mm also unofficially known as the 7 64mm Brenneke though its designer s name was never officially added as a part of the cartridge name is a rimless bottlenecked centerfire cartridge developed for hunting As is customary in European cartridges the 7 denotes the 7 mm bore diameter and the 64 denotes the 64 mm 2 5 in case length The 7 64mm is a popular hunting cartridge in Central Europe due to its 11 95 mm 0 470 in case head diameter and 84 mm 3 3 in overall length allowing it to easily be chambered in the Mauser 98 bolt action rifle that was once standard German military issue 7 64mmFrom left to right 7 64mm 7 92 57mm Mauser 243 Winchester and 222 RemingtonTypeRiflePlace of originGerman EmpireService historyIn serviceNever issuedProduction historyDesignerWilhelm BrennekeDesigned1917Produced1917 presentVariants7 65mmR rimmed SpecificationsParent case8 64mm SCase typeRimless bottleneckBullet diameter7 25 mm 0 285 in Neck diameter7 95 mm 0 313 in Shoulder diameter10 80 mm 0 425 in Base diameter11 85 mm 0 467 in Rim diameter11 95 mm 0 470 in Rim thickness1 30 mm 0 051 in Case length64 00 mm 2 520 in Overall length84 00 mm 3 307 in Case capacity4 48 cm3 69 1 gr H2O Rifling twist220 mm 1 8 66 Primer typeLarge rifleMaximum pressure C I P 415 00 MPa 60 191 psi Maximum pressure SAAMI 379 21 MPa 55 000 psi Maximum CUP50 500 CUPBallistic performanceBullet mass type Velocity Energy9 1 g 140 gr SP 914 m s 3 000 ft s 3 810 J 2 810 ft lbf 10 0 g 154 gr SP 880 m s 2 900 ft s 3 901 J 2 877 ft lbf 11 3 g 174 gr SP 820 m s 2 700 ft s 3 841 J 2 833 ft lbf 11 2 g 173 gr RWS HMK 867 m s 2 840 ft s 4 209 J 3 104 ft lbf Source s Cartridges of the World 1 2 7 65mmRSpecificationsCase typeRimmed bottleneckedBullet diameter7 25 mm 0 285 in Neck diameter7 95 mm 0 313 in Shoulder diameter10 80 mm 0 425 in Base diameter11 89 mm 0 468 in Rim diameter13 32 mm 0 524 in Rim thickness1 40 mm 0 055 in Case length65 00 mm 2 559 in Overall length78 00 mm 3 071 in Case capacity4 53 cm3 69 9 gr H2O Rifling twist220 mm 1 in 8 66 in Primer typeLarge rifleMaximum pressure C I P 380 00 MPa 55 114 psi Contents 1 History 2 Cartridge dimensions 3 Contemporary use 4 See also 5 References 6 External linksHistory EditAt the start of the 20th century the famous German gun and ammunition designer Wilhelm Brenneke 1865 1951 was experimenting with the engineering concept of lengthening and other dimensional changes regarding standard cartridge cases like the M 88 cartridge case then used by the German military in their Mauser Gewehr 98 rifles to obtain extra muzzle velocity In 1912 Brenneke designed the commercially rather unsuccessful 8 64mm S cartridge again in production since 2001 It was intended as a ballistic upgrade option for the Mauser Gewehr 98 rifles that were standard issue in the German military The German military chose however to stay with their 8 57mm IS rifle cartridge avoiding rechambering their service rifles for a cartridge that due to its more favourable bore area to case volume ratio would ballistically outperform the 30 06 Springfield cartridge of the United States Army Brenneke s engineering concept was to create new very powerful for the era cartridges by enlarging exterior cartridge case dimensions like overall length and slightly larger case head diameter compared to the German 8 57mm IS military cartridge case coupled with an increase in maximum pressure The concept was essentially sound and he persisted in the development of new cartridges along this line In 1917 Brenneke necked down his 8 64mm S design of 1912 to 7 mm calibre introduced it as the 7 64mm and achieved major commercial success The 7 64mm offered 10 12 more muzzle velocity than the 7 57mm Mauser This results in a flatter trajectory and better performance at longer range In the years between World War I and World War II the 7 64mm was often regarded by German hunters as a miracle cartridge and dozens of different factory loads were available on the German market It was so highly regarded that the Nazi German Wehrmacht during the 1930s even considered replacing the 8 57mm IS in favour of the 7 64mm for their snipers The Wehrmacht decided just like the German Army had in 1912 to stay with the 8 57mm IS cartridges for their Mauser Karabiner 98ks to keep logistics as simple as possible Besides the 7 64mm rifle cartridge Brenneke also designed a rimmed version for break action rifles such as double rifles and combination rifles as well as for single shot rifles in 1917 The rimmed 7 65mmR variant of the cartridge was also immediately a commercial success 3 In countries where military service cartridges are banned for civil ownership the 7 64 Brenneke is a successful cartridge for hunting and marksmanship Cartridge dimensions EditThe 7 64mm has a 4 48 ml 69 grain H2O cartridge case capacity A sign of the era in which the 7 64mm was developed is the gently sloped shoulders The exterior shape of the case was designed to promote reliable case feeding and extraction in bolt action rifles under extreme conditions 7x64mm maximum C I P cartridge dimensions All sizes in millimeters mm Americans would define the shoulder angle at alpha 2 20 42 degrees The common rifling twist rate for this cartridge is 220 mm 1 in 8 66 in 4 grooves O lands 6 98 mm O grooves 7 24 mm land width 3 70 mm and the primer type is large rifle or large rifle magnum depending on the load According to the official C I P Commission Internationale Permanente pour l Epreuve des Armes a Feu Portatives rulings the 7 64mm Mauser can handle up to 415 00 MPa 60 191 psi Pmax piezo pressure In C I P regulated countries every rifle cartridge combination has to be proofed at 125 of this maximum C I P pressure to certify for sale to consumers This means that 7 64mm Mauser chambered arms in C I P regulated countries were as of 2014 proof tested at 519 00 MPa 75 275 psi PE piezo pressure 4 The SAAMI maximum average pressure MAP for this cartridge is 55 000 psi 379 21 MPa piezo pressure 5 The American 280 Remington cartridge is probably the closest ballistic twin of the 7 64mm When compared to the 7 64mm the 280 Remington has a slightly lower maximum allowed chamber pressure and as an American 7 mm cartridge has a slightly smaller groove diameter European 7 mm cartridges all have 7 24 mm 0 285 in grooves O diameter 6 American 7mm cartridges have 7 21 mm 0 284 in grooves O Contemporary use EditThe 7 64mm is one of the favoured rifle cartridges in Central Europe and is offered as a chambering option in every major European hunting rifle manufacturer s product palette The versatility of the 7 64mm for hunting all kinds of European game and the availability of numerous factory loads all attribute to the 7 64mm chambering s popularity 7 Loaded with short light bullets it can be used on small European game like fox and geese or medium game such as roe deer and chamois Loaded with long heavy bullets it can be used on big European game like boar red deer moose and brown bear The 7 64mm offers very good penetrating ability due to a fast twist rate that enables it to fire long heavy bullets with a high sectional density The 7 64mm s rimmed sister cartridge the 7 65mmR is also very popular in Central Europe for the same reasons as the 7 64mm The legal banning of ex military service cartridges like the 308 Winchester 7 57mm Mauser 8 57mm I 8 57mm IS and the 30 06 Springfield in countries like France and Belgium also promoted acceptance and use of the 7 64mm and the 7 65mmR See also EditList of rifle cartridges Table of handgun and rifle cartridges 7 mm caliber 8 64mm S 9 3 64mm BrennekeReferences Edit Barnes Frank C 1997 1965 McPherson M L ed Cartridges of the World 8th ed DBI Books pp 355 374 ISBN 0 87349 178 5 RWS 11 2 g HMK datasheet permanent dead link Commission Internationale Permanente pour l Epreuve des Armes a Feu Portatives 7 65 R www cip bobp org en tdcc retrieved 16 December 2018 C I P TDCC sheet 7 x 64 ANSI SAAMI Velocity amp Pressure Data Centerfire Rifle Archived 2013 07 02 at the Wayback Machine C I P TDCC sheet 7 x 64 The RWS Ammunition Ballistic Data amp Application Consultant shows several 7x64mm factory loads Archived 2009 08 31 at the Wayback Machine C I P CD ROM edition 2003 C I P decisions texts and tables free current C I P CD ROM version download ZIP and RAR format External links Edit Wikimedia Commons has media related to 7 x 64 mm cartridges Homepage of the Brenneke Company Lutz Moller s webpage on the 7x64mm Brenneke including images The 7x64 Brenneke by Chuck Hawks 7 X 64 BRENNEKE at Accurate Reloading 7x64 Brenneke cartridge dimensions at Steves Pages Patronenportrat 7 x 64 Kraftpaket oder Papiertiger Wild und Hund 6 2005 C I P TDCC sheet 7 x 64 Retrieved from https en wikipedia org w index php title 7 64mm amp oldid 1128792820, wikipedia, wiki, book, books, library,
