9x25mm Super Auto G

9x25mm Super Auto G


deadThe Missing Round

The competitive and inventive world of the International Practical Shooting Confederation (IPSC) has produced a number of wildcat cartridges. However the 9x25mm Super Auto G, or as it’s unofficially called the 9×25 Super Auto Grillmeyer is probably one of the least known ones, as it was unable to draw the same kind of attention as other, more popular, competition IPSC calibers. This obscure cartridge was developed in 1991 and is a true ghost of the shooting world. Currently no manufactures produce factory ammo in this caliber. It exists only as a myth and legend floating around the file cabinets that house the C.I.P.’s data sheets.

Quick draw! or not…

The Commission Internationale Permanente Pour L’Epreuve Des Armes A Feu Portative, “Permanent International Commission for the Proof of Small Arms”, or just more simply, C.I.P. certified this Austrian round in 1991. Beyond the specification from C.I.P. information about this round is about as scarce as ammo for it. As far as we at Dead Calibers can tell the round was developed by Horst Grillmayer however our sources were not exactly the best and digging up information about this round has proven difficult. However we were able to find some information in the forums over at Cartridge Collectors.org. Take the following information with a grain of salt.

9x25mm Super Auto G or 9x25mm SAG was developed by Horst Grillmeyer. Image via Cartridge Corner
9x25mm Super Auto G or 9x25mm SAG was developed by Horst Grillmeyer – Image via Cartridge Corner

According to John Moss over at Cartridge Collectors the round was developed in part in the Republic of South Africa, however it was not so much testing but production of brass specifically for these rounds. With early prototypes of the round utilizing necked down .40 Smith and Wesson Cases from PMP in South Africa. However production of the rounds would eventually end up in Hungary with MFS making the majority of the production rounds. However the post states that Fiocchi also made one run of the cartridge as well.

Mr. Moss goes on to say that most of the early prototypes of this round used Hertenberger 10 mm brass and thus carried a “HP 10 MM AUTO” headstamp. However it seems that Horst Grillmayer was chasing trends in the IPSC shooting world. The whole reason for the 9x25mm Super Auto G was because 10mm had become a flavor of the month cartridge and when the popularity of the 10mm began to wain in favor of the .40 Smith & Wesson, Grillmayer moved onto a new project, the 9x22mm Major. It was this move that probably sealed the fate of the round for good.

While an in depth look at the 9x22mm Major will have to be for another article, it was essentially the .357 Sig, however Grillmayer insisted that his design was better than the .357 Sig as it had a longer neck and “[put] better tension on the bullets in the other cartridges in the magazine”.

Similar But Not The Same

The design of the 9×25 Super Auto G, utilizes the same design idea that has been used in a number of other cartridges such as the .40 Super and more notably the .357 SIG. A larger, established cartridge necked down to a smaller, but still readily available diameter to increase the muzzle velocity with more powder behind a lighter bullet. The end goal in mind being more force down range.

Being developed for IPSC competition, the 9×25 Super Auto G was supposed to make it into the Major Power Factor. Yet, like many other wildcat cartridges that sought to knock off the .38 Super from its throne the benefits were negligible and the .38 Super remained entrenched. .38 Super could do what IPSC shooters wanted, had a stronger following, and they saw little reason to switch.

While C.I.P. certified the design specifications in 1991, if there was ever any hope of this cartridge catching on, the C.I.P. certification came much too late. The 9×25 Super Auto G was an almost exact replica of the 9x25mm Dillon, which was SAAMI certified in 1988. The Super Auto G distinguished itself slightly by being able to handle only about 700 more PSI than its American, wildcat, cousin. The slightly different dimensions, marginal increase in case volume, and slightly higher pressure did little to win anyone over. The 9×25 Dillon struggled, and the Austrian 9×25 Super Auto G, fared far worse.

Factory and hand loads

9x25mm Super Auto G
This is all that remains of the 9x25mm Super Auto G now.

Currently no manufacturer, that we can find, makes factory ammunition in 9x25mm Super Auto G. For hand loaders there are still some options though. Pacific Tool and Gauge used to offer a reamer for the round, however since first writing this article the listing has disappeared and no dies or brass can be found. 10mm brass can be necked down to the 9mm specification though. The intrepid hand loader who moonlights as a gunsmith, or has a friend who is one and wants to take on the challenge, might be able to accomplish a 1911 or similar build using this round. Yet, with the similarities between the Super Auto G and the Dillian, the effective differences between the two are about the same as a skunk and a striped polecat. Hand loaders may find that sticking to the American alternative to this European round a far less headache inducing task given the limited information about this round available.

Chambered firearms

As of 2015 no firearms are being produced in 9×25 Super Auto G. If there are any firearms still in useable condition today they most like call Austria home. The most likely platform for the rare 9×25 Super Auto G, is actually the Glock 20, as I can’t find any other mention of it being used in other guns. However, given that is was intended for race guns, however it’s reasonable to assume 1911’s have fired the round as well at some point.

A real ghost gun

The 9x25mm Super Auto G is dead in just about every sense. Like many wildcat cartridges before it the niche it sought to improve upon was already filled or it just didn’t catch on. Yet without the constant experimentation and failures we would not be where we are today so let’s take a moment and say, “In memoriam, the 9x25mm Super Auto G, may you live forever in the C.I.P. data sheets.”

Update 12/1/16: A previous version of this article erroneously listed this caliber as coming from Australia. Additionally we have updated this article with new information on the development and production of the cartridge.  

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