Today I had a thought about handgun cartridges and figured since we have arrived with certain calibers through evolution, there must be a single handgun cartridge which is the overall best. So I was thinking that there have been famous shootouts that have caused significant change in handgun calibers such as the 1986 FBI Miami shootout. These incidents have helped the evolution of certain calibers. So here goes my thoughts. The 10mm came into existence in the early 80's. Shortly after the Miami shootout occurred and FBI adopted the 10mm. The 10mm was too powerful for standard issue so it was dropped by FBI. However the 10mm had certain desirable characteristics such as better trajectory and range than the big ol .45. So the .40 S&W was created to address recoil. The 40.S&W was then considered by some to have lost velocity so the .40 was then evolved into the .357 sig. This is where current evolution ends so the .357 Sig must be the best defense handgun caliber. But wait... So too has the .45 ACP evolved. The .45 ACP has evolved into the .45 GAP. The GAP retains the same characteristics as the ACP but in a shortened cartridge which allows for many more platforms for this cartridge. So in reality the .357 Sig and the .45 GAP have evolved the most. Therefore the .357 Sig and .45 GAP must be the all time best handgun cartridges. Since the .357 Sig is really shooting a 9mm projectile this ironically this brings us right back to the 9mm vs .45 debate. Any thoughts?