>>64465708
It never failed. 10mm is simply niche, and misunderstood. It's niche is full-size autoloaders, which have gone out of favor. But even in that realm it has to compete with 5.7, 9, 45, 460, ect.
It's misunderstood because the majority of people think that the only appeal is the full power loads, which are both expensive and uncommon. The actual appeal to the cartridge is VERSATILITY. Just like 357/38 Special and 44 mag/44 special, you don't have to shoot the full power loads. You simply have the option. Also even the "weak" stuff(range loads are consistently slightly hotter than the comparable. 40 load, look it up nigger, god I hate that rumor)tends to shoot pretty nice due to the guns being a fullsize more often than not.
And most guns can straight up shoot .40 without a conversion barrel.
It's a good round. Unfortunately the fullsize autoloader niche is so small that anyone even bothering out of curiosity gets something more interesting.