What is .45 Auto cartridge?
I'm looking to buy the Ruger P90, but info on the web state that the gun is chambered for .45 Auto. I've look high and low for info on the cartridge, and so far I have no idea what's the deal with .45 Auto. I want to standardize my investment to a single cartridge, that is sufficient for self-defense, to use in both semis and revolvers. It seems that .45 are available on both semis and revolvers.
I've heard (more like read) many good review on the P90 and I want to invest in this gun and I want to know more about the .45 Auto cartridge. Thanks in advance for your input.