I do find this list interesting, but it also frustrates me a bit because it gives only a small angle of a snapshot and it leaves me asking more questions than it answers. I don't mean to sound like I am complaining at the information you've shown, but this is how it hits me.
The fact that it's a couple years old means that we see no evidence of the fall of .40 S&W and we also see no evidence of the fast rise in the popularity of the 10mm cartridge.
Also, and there is basically
no way whatsoever to compile an accurate list, but I would argue that a huge share of passionate, high volume shooters that eat through lots of ammo are handloading, and we couldn't possibly get any way to measure that impact.
When it comes to factory ammo, handloaders can save money rolling their own 9mm and .45 ammo, but handloaders can
save a monthly car payment worth of money when they roll their own magnum revolver ammo. .357, .41, .44, .454, .460 and .500 Magnum have
stupid prices on factory ammo.
Again, I am coming off like a whiner, not my intention. But I see the list posted and I wish to see cartridge popularity, but what I actually see is what sells best in cheap factory FMJ, which isn't representative of cartridge popularity. That leaves me wishing for better or different info.
Even still, this is interesting stuff and makes for quality discussion!