9.3×64mm Brenneke FMJ cartridge
|Place of origin||Weimar Republic (Germany)|
|Case type||Rimless, bottleneck|
|Bullet diameter||9.30 mm (0.366 in)|
|Neck diameter||10.04 mm (0.395 in)|
|Shoulder diameter||12.05 mm (0.474 in)|
|Base diameter||12.88 mm (0.507 in)|
|Rim diameter||12.60 mm (0.496 in)|
|Rim thickness||1.30 mm (0.051 in)|
|Case length||64.00 mm (2.520 in)|
|Overall length||85.60 mm (3.370 in)|
|Case capacity||5.71 cm3 (88.1 gr H2O)|
|Rifling twist||360 mm (1 in 14.17 in)|
|Primer type||Large rifle magnum|
|Maximum pressure (C.I.P.)||440.00 MPa (63,817 psi)|
|Test barrel length: 650 mm (25.59 in)|
Source(s): RWS / RUAG Ammotech 
The 9.3×64mm Brenneke (also unofficially known as the 9.3 x 64) is a rimless bottlenecked centerfire cartridge developed for big-game hunting. The 9.3 denotes the 9.3 mm bullet diameter and the 64 denotes the 64 mm case length.
One of the most successful cartridge designs of the famous German gun and ammunition designer Wilhelm Brenneke was the 9.3×64mm Brenneke. He designed this cartridge ex novo (the 9.3×64mm Brenneke has no other cartridge as parent case) and introduced it commercially in 1927. This big-game cartridge is the most powerful cartridge he designed. The 9.3×64mm Brenneke was designed to have the largest possible case capacity without any shape or dimensional drawbacks that would hamper its chambering and perfect functioning in Mauser Gewehr 98 rifles that were then standard issue in the German military.
For standard military Mauser 98 rifles besides common rechambering alterations the internal magazine boxes have to be adapted by a competent gunsmith to function properly with 9.3×64mm Brenneke cartridges since the cases are longer and have a larger diameter than the 7.92×57mm Mauser military cartridges.
The widespread availability of standard-size Mauser 98 rifles in central Europe and the fact that the .375 Holland & Holland Magnum cartridge and its necked-down version the .300 Holland & Holland Magnum with approximately 72.4 mm case length were too long to fit in standard-sized Mauser 98 bolt action rifles made the shorter 9.3×64mm Brenneke an interesting chambering option for European big-game hunters.
Brenneke introduced the 9.3×64mm Brenneke with a 19.65-gram (303 gr) Torpedo Ideal Geschoss (TIG – Torpedo Ideal projectile) designed for big game and a 17-gram (262 gr) jacketed bullet with lead, bronze or a copper tip for smaller game. Later a special TIG with a bronze tip and a full metal jacket bullet where added for thick skinned dangerous game. After that Brenneke developed a 19-gram (293 gr) Torpedo Universal Geschoss (TUG – Torpedo Universal projectile) with a lead tip that is still produced.
In 2009, the Russian military developed the semi-armour-piercing 9SN cartridge for the 9.3×64mm Brenneke SVDK variant of the Dragunov sniper rifle. This cartridge has a 16.6 g (256 gr) pointed boat-tailed FMJ bullet with steel core and achieves a muzzle velocity of 770 m/s (2520 ft/s). The 9SN cartridge should be able to defeat body armour at ranges up to 600 metres (660 yd).
The 9.3×64mm Brenneke ballistic performance is on par with the .375 Holland & Holland Magnum while being smaller and using less propellant - it has 8% less case capacity, making it a more modern, efficient design.
With the official certification of the 6.5×63mm Messner Magnum this German 64 mm "family" of magnum rifle cartridges that all share the same basic cartridge case got expanded 71 years later.
The cartridges in this German 64 mm cartridge "family" are, in the order of development:
- 9.3×64mm Brenneke (1927)
- 6.5×63mm Messner Magnum (2002)
The 9.3×64mm Brenneke has 5.71 ml (88 grains) H2O cartridge case capacity. A rare feature of this German rimless bottlenecked centerfire cartridge design is that it has a slightly rebated rim (P1 - R1 = 0.28 mm). A sign of the era in which the 9.3×64mm Brenneke was developed are 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.
9.3×64mm Brenneke maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).
Americans would define the shoulder angle at alpha/2 ≈ 17.49 degrees. The common rifling twist rate for this cartridge is 360 mm (1 in 14.17 in), 4 grooves, Ø lands = 9.00 mm, Ø grooves = 9.28 mm, land width = 4.60 mm and the primer type is large rifle magnum.
According to the official with Commission Internationale Permanente pour l'Epreuve des Armes à Feu Portatives (C.I.P.) rulings the 9.3×64mm Brenneke case can handle up to 440 MPa (64,000 psi) piezo pressure. In C.I.P.-regulated countries every rifle cartridge combo has to be proofed at 125% of this maximum C.I.P. pressure to certify for sale to consumers. This means that 9.3×64mm Brenneke chambered arms in C.I.P. regulated countries are currently (2018) proof tested at 550.00 MPa (79,771 psi) PE piezo pressure.
The .375 Holland & Holland Magnum cartridge is probably the closest ballistic twin of the 9.3×64mm Brenneke. When compared to the 9.3×64mm Brenneke the .375 Holland & Holland Magnum has a slightly larger calibre and it is a belted cartridge.
The 9.3×64mm Brenneke in field use
The 9.3×64mm Brenneke is a powerful cartridge and one that's been highly praised by outdoor writer Craig Boddington as easily being equal to, if not better than, the .375 H&H. Like every other big-game cartridge it presents a stout recoil. An appropriate fitting stock and an effective muzzle brake will help to reduce recoil induced problems. An advantage of the short, stocky 9.3×64mm Brenneke is that it can be chambered in standard sized bolt-action rifles.
German big-game hunters often use 9.3×64mm Brenneke rifles in Africa for hunting plains game and Big Five game, where British or American hunters would choose the .375 Holland & Holland Magnum or similar cartridges. As a pure civil cartridge it can be used in countries which ban civil use of former or current military ammunition. The 9.3×64mm Brenneke has a good accuracy reputation i.e. it is not hard to develop or find loads that will shoot 1 moa (0.3 mil) or better out of decent standard mass-produced rifles.
There are not many factory loads available. After World War II only the 19-gram (293 gr) TUG was produced by the Brenneke Company and later an 18.5-gram (285 gr) round nose and a 16-gram Torpedo Optimal Geschoss (TOG – Torpedeo Optimal projectile) bullet were added to the Brenneke factory load pallet. With these loads the 9.3×64mm Brenneke gained a good reputation amongst German hunters on their big-game safaris.
The German ammunition manufacturer RWS also offers two factory loads. In America A-Square offers the 9.3×64mm Brenneke loaded with 18.5-gram (285 gr) lion load, 18.5-gram (285 gr) dead tough and 18.5-gram (285 gr) monolithic solid bullets.
Due to its good field reputation, efficiency and flexibility, the 9.3×64mm Brenneke is often used by reloaders. They have used this cartridge extensively to create powerful loads by handloading. Whilst staying within the 440 MPa C.I.P. limit a 9.3×64mm Brenneke rifle with a 610 mm (24 in) long barrel and appropriate modern gunpowder can be handloaded to propel bullets ranging from 5.8–21.1 grams (90–325 gr) for all kinds of hunting.
Reloaders realized that bullets with different characteristics can be utilized to produce varying effects on game. They also realized that from 8 mm calibre upwards the rise of sectional density and penetrating capability of practical spin stabilized rifle bullets (bullets up to 5 to 5.5 calibres in length) tends to flatten out.
This means that loaded with light, short and soft-nosed 9.3 mm bullets the 9.3×64mm Brenneke can be used on remarkable small game. Loaded with heavy, long and hard (solid copper) bullets the 9.3×64mm Brenneke offers enough weight and speed-derived power to penetrate heavy and dangerous game. The 9.3×64mm Brenneke is suitable for hunting any game animal on the planet, though certain sub-Saharan Africa countries have a 9.53 mm (0.375 in) minimum calibre requirement for hunting dangerous Big Five game—i.e. leopard, lion, cape buffalo, black rhinoceros and African elephant. In the growing number of countries where the 9.3×64mm Brenneke can be legally applied, it is used successfully for hunting elephant, making it a flexible safari cartridge.
The 9.3×64mm Brenneke as parent case
Beside the 9.3×64mm Brenneke rifle cartridge Brenneke also designed a rimmed version for break action rifles of the cartridge in 1938. The rimmed variant is known as the 9.3×65mmR.
The 9.3×64mm Brenneke parent case for the 6.5×63mm Messner Magnum
The 9.3×64mm Brenneke case has also functioned as the parent case for the 6.5×63mm Messner Magnum, which is essentially a 6.5 mm (.264 in) necked-down version of the 9.3×64mm Brenneke. The wildcat status of the 6.5×63mm Messner Magnum ended in 2002, when it was C.I.P. certified and became an officially registered and sanctioned member of the German 64 mm "family" of magnum rifle cartridges.
The 6.5×63mm Messner Magnum has 5.42 ml (83.5 grains) water cartridge case capacity.
6.5×63mm Messner Magnum maximum C.I.P. cartridge dimensions. All sizes in millimetres (mm).
Americans would define the shoulder angle at alpha/2 = 29 degrees. The common rifling twist rate for this cartridge is 200 mm (1 in 7.87 in), 6 grooves, Ø lands = 6.45 mm, Ø grooves = 6.70 mm, land width = 3.50 mm and the primer type is large rifle magnum.
According to the official C.I.P. guidelines the 6.5×63mm Messner Magnum case can handle up to 440 MPa (64,000 psi) piezo pressure.
The idea behind the 6.5×63mm Messner Magnum was to develop a very powerful 6.5 mm long range hunting cartridge that achieves very high muzzle velocities out of relatively short 600 mm (23.6 in) long rifle barrels. The developer, Joseph Messner from France, chose the 9.3×64mm Brenneke as parent case, since it offers enough case capacity and a competent gunsmith can relatively easy rechamber a standard Mauser 98 or any other bolt-action rifle to accept 9.3×64mm Brenneke based cartridges. Beside the 6.5×63mm Messner Magnum rimless rifle cartridge, Messner also designed a rimmed version for break action rifles of the cartridge called the 6.5×63mmR Messner Magnum.
Due to the large case capacity in relation to the 6.5 mm (.264 inch) calibre bore size the 6.5×63mm Messner Magnum is very harsh on barrels. It typically wears out a rifle barrel in 500 to 1000 rounds. A lot of thorough barrel cleaning (after every 5 shots) and carefully avoiding long strings of shots help to minimize barrel wear. This makes this cartridge impractical for most competition shooters who tend to fire a lot of rounds in practice to acquire and maintain expert long-range marksmanship.
The German 6.5×68mm cartridge introduced in 1939 and the American .264 Winchester Magnum cartridge introduced in 1959 are probably the closest ballistic twins of the 6.5×63mm Messner Magnum and both are more widely available to purchase at retail.
Another commercial cartridge that uses the 9.3×64mm Brenneke as parent cartridge is the .376 Steyr. This is essentially a shortened 9.3×64mm Brenneke cartridge necked-up to 9.5 mm (.375 in) calibre developed as an evolution of Jeff Cooper's "Super Scout" medium rifle concept, which was in turn an extension of his original scout rifle concept. With a higher felt recoil, the .376 Steyr is the largest practical cartridge for use in a short, lightweight weapon as the Steyr Scout rifle.
Cartridges that are not officially registered with nor sanctioned by C.I.P. (Commission Internationale Permanente Pour L'Epreuve Des Armes A Feu Portative) or its American equivalent, SAAMI (Sporting Arms and Ammunition Manufacturers' Institute) are generally known as wildcats. By blowing out standard factory cases, the wildcatter generally hopes to gain extra muzzle velocity by increasing the case capacity of the factory parent cartridge case by a few percent. Practically there can be some muzzle velocity gained by this method, but the measured results between parent cartridges and their 'improved' wildcat offspring is often marginal. Besides changing the shape and internal volume of the parent cartridge case, wildcatters also can change the original calibre. A reason to change the original calibre can be to comply with a minimal permitted calibre or bullet weight for the legal hunting of certain species of game.
Wildcats are not governed by C.I.P. or SAAMI rules so wildcatters can capitalize the achievable high operating pressures. Because the 9.3×64mm Brenneke offers a pressure-resistant cartridge case that can relatively easily be reloaded with primers, powder and bullets and hence be reused several times, it has become quite popular amongst wildcatters.
An example of a 9.3×64mm Brenneke-based wildcat is the 8mm Mázon. This is essentially an 8 mm (.323 in) necked-down version of the 9.3x64mm Brenneke.
An example of a 6.5×63mm Messner Magnum-based wildcat is the 8.5 Messner Magnum. This is essentially an 8.5 mm (.338 in) necked-up version of the 6.5×63mm Messner Magnum.
A .30 caliber example is the .30 Hembrook Long. It was designed in 2005 by Robert Hembrook of Austin, Texas. The finished case was designed to give similar ballistics to the various .300 magnums while having a usable length neck, and fitting standard Mauser Gewehr 98 sized magazine boxes.
- RWS Ammunition Ballistic Data & Application Consultant Archived 2009-08-31 at the Wayback Machine
- Barnes, Frank C.; Mann, Richard A. (5 October 2012). Cartridges of the World: A Complete Illustrated Reference for More Than 1,500 Cartridges (23 ed.). Iola, Wisconsin: Gun Digest Books. p. 433. ISBN 1-4402-3059-5.
- Ammunition (cartridges) for rifles and machine guns
- TDCC datasheet 9,3 × 64 Brenneke
- "What is the maximum length of a spin stabelized projectile? by B. Kneubuehl" (PDF). Archived from the original (PDF) on 2007-11-27. Retrieved 2007-07-04.
- Minimum required caliber for hunting Africa
- "Minimum Calibers for Africa". Archived from the original on 2014-07-14. Retrieved 2014-04-07.
- Hunting Laws & Rifle Importation NAPHA Namibia Professional Hunting Association
- Jagen Weltweit 9,3 x 64 Brenneke by Norbert Klups (in German)
- Jagen Weltweit Rasanz aus kurzem Lauf by Norbert Klups (in German)
- 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))
This article includes a list of references, but its sources remain unclear because it has insufficient inline citations. (September 2007) (Learn how and when to remove this template message)
- Homepage of the Brenneke Company
- Lutz Möller's webpage on the 9.3 x 64 Brenneke (including images)
- Lutz Möller's webpage on the 6.5 x 63 Messner Magnum (including images)
- Website of Mr. Joseph Messner
- Lutz Möller's webpage on the 8 mm Mazón (including images)
- 9.3x64mm Brenneke reloading info at Reloader's Nest
- A Most Marvelous Metric - The 9.3mm holds the light heavyweight crown among European bore sizes and should be more popular stateside than it is. - by Craig Boddington