Yep, the .40 having become perhaps the most popular cartridge in law enforcement in a fairly short span of time shows it had no niche to fill in the market...
As originally designed, the 10mm has as much energy at 75 yards as the .45ACP has at the muzzle. It shoots flatter than the .45, and is designed to fit in guns of similar size to the .45.
Reasons it did not take off have already been noted. That said, the cartridge is reasonably popular with hand loaders who like automatics.
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