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The 10mm auto cartridge was a concept of Whit Collins who put the project together while working with Peterson Publishing in Hollywood. He was assisted by John Adams and Irving Stone (of BAR-STO Barrels), as well as Jeff Cooper. The goal was to develop a cartridge that would raise the power, range and penetration of 45 ACP, while remaining manageable from a recoil perspective. They wanted the round to work in a CZ-75 pistol, but since none was available to them in the cold war era, the used a Browning P35 (High Power). The first attempt was to use a .41 cal pistol bullet, but it was too big to reliably feed, so they went with the .400 cal bullet from the old 38-40 round (of old west fame). The case the chose to mate with this bullet was a cut-of .30 Remington (essentially the rimless version of the venerable 30-30). That prototype was shorter than today's 10mm auto, due to the HP's tight mag dimensions. The results where published in a 1970's vintage Guns and Ammo magazine. Velocities of 1200 fps were logged. This work inspired Tom Dornaus and Mike Dixon to develop a CZ75 clone to shoot a slightly longer version of the round The gun was called the Bren 10. It was a 10 shot number which was much anti- cipated by the many who ordered the gun months ahead of the time any were produced. Unfortunately for these buyers, D&D never seemed to be able to deliver mags that worked properly. Many orders were filled late and without any mag at all. D&D failed (I think) and the round languished. Fortunately (for we 10mm fans) Colt picked up the round and chambered the 1911 for it. This gun was called the "Delta Elite" and featured a special 18-22 lb return spring and a plastic recoil buffer to handle the high energy of the 10mm round. When the Delta was introduced, it got rave reviews for its power & higher-than-45ACP accuracy. Shortly thereafter, reports started to circulate that the gun was overstressed and was likely to burn itself out in 2,000-4,000 rounds. This is absolute horseshit, but was all that the 45 ACP gang could come up with to discredit 10mm. They were all having trouble sleeping at night with the thought that their beloved (but moribund) 45 round was being up-staged in the holy sanctum of the 1911 itself. I have pumped 12,000 plus rounds through my Delta and it looks and shoots like a new gun. In addition to the Colt, 10mm Auto has found its way into a Smith & Wesson semi auto pistol (the 1006), a S&W revolver (yes a wheel gun, which hold in the rounds by means of little stamped steel clips), a single shot pistol (the Thompson Contender), a Tommy Gun copy (the Auto Ordinance 1927), and of course your Glock (a good gun). The Ten's problem was hat the people who insisted on it wouldn't buy it. They all proved to be pussys who said they wanted a hot cartridge but then went on to seek out limp-wrist alternatives; first the down-loaded 10mm "Fed-Lite" round, and eventually the 40 S&W. (If the 357 magnum had been created first, these goofs would have subsequently encouraged the development of the 38 special!). Ironically the 40S&W is dimensionally similiar to the 10mm prototype round which was a shorter-than-optimum compromise, allowing the round to fit the Browning HP. The 40 S&W has poor pressure curve characteristics (relative to the 10mm) which means that it develops high peak pressures to produce velocities which a light-loaded 10mm can effortlessly match at much lower pressures (just as a downloaded 30-06 can match 308 ballistics at lower pressures, due to the larger case). Long live the 10mm auto! Regards, Keith M.