My first three were .40 S&W. I did a lot of research on what caliber to buy when I purchased my first handgun. After that I thought, why do I want to have more than one type of round needed for any of my guns.
Then I bought the .45 acp. I am hooked and now have more ammo stockpiled for my one .45 than I do for my three .40s!
Then I bought the .45 acp. I am hooked and now have more ammo stockpiled for my one .45 than I do for my three .40s!