Originally Posted by Arik
If you read what one of THE FBI guys here wrote, the 10 was never loaded all that hot. Something like 950fps. It was never a super potent round. Certainly not what everyone on the internet claims
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Which is why they figured they could make the .40 from the same 10mm cartridge. I guess it wasn't good having more gun to shoot a weaker round. They could have continued with the lower 10mm round but it was only 3/4 of its potential out of a beefier gun. Whatever, it lost popularity rather than gain it, while a LOT of people on this forum won't carry anything but a .45.