Home Forums Hunting & Shooting Handguns why do new handgun calibers so often fail?

I have always looked at cartridge selection as what cartridge is going to be the best fight stopper with the worst ammo under the worst conditions. If a guy runs out of $30/ 20 9mm Gucci ammo, then what. 9mm ball ammunition is at the bottom of the list for me unless it’s the 147 FMJ FP.