Wildcatting the  9,3x64 Brenneke

One way not to invent the wheel again is searching for a little known basic case. That means more or less little known outside Europe. But even among those very few cases one can find some clever designed wildcats. The 9,3x64 Brenneke for instance has some friends all over the world who appreciate its performance but due to the intermediate head and base dimensions only few manufacturer are currently chambering it. The introduction of the 376Steyr which uses a shortened 9,3x64 Brenneke case has not changed the situation substantially.


Some cartridges based on the 9,3x64 Brenneke:

8x64 Mazón / 8 mm Mazón / 8-9,3x64S Brenneke-Mazón (.323cal. , designed by Alvaro Mazón)

8,5x64 (.338 cal. , designed by Lutz Möller )

6,5x63 Messner Magnum (NO wildcat, CIP-Standard): 

These 9,3x64 Brenneke descendants are all one needs to imagine his own wildcat mainly by varying bullet diameters. If not, send an e-mail.

Small variations of shoulder angles and/or neck lengths will not affect performance very much.

Shooting a wildcat may be eccentric but shooting a 9,3x64 Brenneke wildcat really is eccentric!


                                       30 Hembrook Long

This is one of the rare 9,3x64 Brenneke wildcats, designed by Robert C. Hembrook.

The genesis of this cartridge started with the ownership of a rifle in 9,3x62 caliber and the meditation about other 9,3mm’s and the Brenneke case. After a 9,3x64 Brenneke case was placed near a 30-06Springfield the idea was born to use the larger volume of the 9,3x64 Brenneke for a .30 caliber cartridge of the same length- and obviously the same appearance.

It has slightly more inside volume than the 300WSM and therefore roughly the same performance when loaded to same pressures. Dimensions allow rechambering of any 30-06Springfield rifle and of course simple rebarreling of any 9,3x64 Brenneke rifle. As it is intended for standard length actions magazines can rather easily be adapted to this round. 30-06Springfield bolt heads must be opened up to this ‘special’ diameter, too.

If you like to know more about the 30 Hembrook Long write to Robert C. Hembrook.