But something like a 130 grain (8.5 gram) 9.3mm bullet at 1040 fps from a locked breech would be an entirely different proposition from a blowback Makarov.
But I've been a fan of the 9.8mm Colt ever since I first read about it.
And it would require a firearm capable of handling the pressures levels associated with 40 S&W or 10mm Auto. So you would get a marginal terminal performance upgrade from 9x19, and marginally less performance than 40 S&W.
So I think it that is a non-starter considering that a 125gr pill in 9x19 can make it to the 1040fps level, and 165gr 40 S&W loads reach 1040 fps. Too much overlap to justify a 9.3mm bullet that does the same thing, at least that would be my excuse if I were trying to bring a new cartridge to bear on the market.
Jimro