|No one seems to know the person or date this cartridge was invented.
The 10mm (AMT) Magnum was introduced in 1992 as a "Proprietary" Cartridge
for the AMT; (Arcadia Machine &Tool Inc.) later bought by IAI
(Irwindale Arms Incorporated) and now owned by the High Standard
The 10 mm Magnum was used in AMT (IAI) Automag IV pistol.
Basically the 10mm Auto Mag. is a lengthened 10 mm Auto, with a lot more energy.
To my knowledge, no major ammunition company is producing this cartridge
for resale, and the owners of the pistol have to load their own ammunition.