I've actually selected a caliber before just for the excuse to get new reloading dies and components. That's actually how I ended up acquiring a .357 SIG, which is sort of a cousin-caliber of the .40.
I remember turning 18 and going out with my brother to buy a gun (yea I know - straw purchase - so the statute of limitations is way past and besides he's no longer on the planet). He kept pushing for me to buy a S&W .41, telling me it would be worth more in 20 years than almost anything else I could buy.
But I saw a Model 19 in .357 and loved it. So much that I bought it and carried it for almost 35 years. I always loved firing the .357 at the range. Everyone would have their Glocks and Sigs in 9mm and .40 all with their predictable reports and I would pull my trusty old wheel-gun out and
BLAM! BLAM! BLAM! BLAM! BLAM! BLAM!
As I retracted my target I would casually look around to see that everyone had stopped shooting to see who the hell was making all that noise. I loved it! And accurate as all get-out. Definitely a nail-driver.
Since then I've acquired .40's and .45's and my current primary carry is a Kel-tec .40 which is a great piece but not as powerful or anywhere as accurate. I like it because it is so compact.
Let's face it - I love guns!