I know that there are many diehards who refuse to accept the fact that the 45 ACP cartridge is now obsolete. This is especially true of many 1911 pistol fans. But people need to face today's facts: the 45 ACP cartridge is over 100 years old, and is clearly now obsolete. We have better alternatives that are now available. This video below does a good job of explaining many of the reason why you should not choose the 45 ACP as the cartridge for your pistol: .