Welcome to Teppo Jutsu LLC, home of the .458 SOCOM, .338 Spectre and others.

Teppo Jutsu refers to the "art of the rifle", a warrior art practiced in feudal Japan by the Samurai. Contrary to popular belief, the Samurai did use firearms and as with all their weapons arts, were quite the skilled "riflemen".  Similar to the other weapons employed, for the Samurai this art encompassed all aspects of the rifle as a weapon: achieving accuracy, proper cleaning and maintenance, rifle and ammunition design and development, as well as using the rifle in Close Quarters Combat. This latter included such skills as weapons retention, striking with the rifle as a blunt weapon, and even the use of the bayonet (Juken Jutsu).
 View 458 Reload Instructions

In today's world, this art has found new following with several new warrior classes: the hunter, the bench-rest shooter, the law enforcement professional, and last but not least, the true descendant of the ancient "Teppo-ka", the military sniper. 


While our main focus here at Teppo Jutsu is on the development of new cartridges for existing firearms platforms, we also offer some unique designs for expanding the operational envelope of well-established small arms. Our philosophy revolves around two main aspects: firepower and flexibility. Our ammunition designs are intended to offer the greatest amount of firepower feasible from standard weapons while increasing the types of applications for which they can be used. On the other hand, we feel that "caliber interchangeability" offers the greatest flexibility, and our weapons designs are specifically geared towards this concept.


Check the What's New! page!

We once again have a fully functional FORUM where we discuss all things .458 plus our other creations, as well as hunting, reloading, etc.  There is even a spot for some more lighthearted discussion on things like how to barbecue fish ...



We have entered a licensing agreement with Rock River Arms, Inc. to bring the .458 SOCOM to the masses.

Their initial offering will be a 16" carbine as shown below. 






Due to challenges in getting the brass, the .500 Phantom will no longer be offered.  We do, however, have the reamer and head space gauges available for rental.  If we are able to secure a new brass supplier (or a LARGE batch of brass from the current supplier) we will start offering this caliber again.  It's a shame, but we don't want you left with a great rifle and nothing to shoot.   QUALITY CARTRIDGE now offers the brass for those who are interested in this unique cartridge.



Sources for .458 SOCOM Ammunition

SBR Ammunition

Offerings include JHP, Subsonics as well as TRACERS!


Reeds Ammunition

Those of you already enjoying the fury of the .458 SOCOM or possibly the silence of the .338 Spectre, send us your stories or pictures, and let us know how we can help meet your shooting needs. 




Send mail to with questions or comments about this web site.
Copyright 2011 Teppo Jutsu LLC.
Last modified: June 1, 2011