The 9.3x64 Brenneke
By Chuck Hawks
Wilhelm Brenneke designed the 9.3x64 around 1910. This powerful medium bore cartridge is on the order of the .358 Norma Magnum or .375 H&H Magnum in application and effectiveness.
The 9.3x64 is intended for use primarily in bolt action rifles. It is built on a magnum size but beltless case with a slightly rebated and unusual rim diameter of .496" and a body diameter at the base of .507". The shoulder angle is 17 degrees. The case length is 2.52". Overall cartridge length is 3.37". 9.3x64 ammunition is loaded to a maximum average pressure of 63,861 piezo psi.
9.3x64 Ammunition is factory loaded by RWS in Germany and A-Square in the United States. 9.3mm (.366") bullets suitable for reloading are produced by Barnes, Nosler, RWS, Speer, Swift, and Woodleigh, among others. New 9.3x64 rifles are built in Europe.
RWS factory loads for the 9.3x64 are supplied with 247, 285, and 293 grain bullets. The 247 grain RWS soft point bullet is loaded to a muzzle velocity (MV) of 2760 fps and muzzle energy (ME) of 4178 ft. lbs. The 285 grain RWS soft point bullet has a MV of 2690 fps and ME of 4590 ft. lbs. The heavy 293 grain RWS soft point bullet is loaded to a MV of 2590 fps and ME of 4298 ft. lbs.
9.3x64 reloading data can be found in the A-Square and Nosler reloading manuals. According to Nosler data, their 250 grain Ballistic Tip spitzer bullet (SD .267) can be loaded to a MV of 2640 fps in front of 63.0 grains of RL15 powder, and a MV of 2802 fps in front of 67.0 grains of RL15.
The 286 grain Nosler Partition spitzer bullet can be driven to a MV of 2476 fps by 62.0 grains of RL15, and a MV of 2601 fps by 66.0 grains of the same powder. RL15 proved to be the most accurate powder with both Nosler bullets. Nosler technicians used RWS cases and Remington 9 1/2M primers for these loads, which were tested in a 25.5" barrel.
Note: A full length article about the 9.3x64 can be found on the Rifle Cartridge Page.
Copyright 2005 by Chuck Hawks. All rights reserved.