gunbelts.com Apr 12, 2017
The dominant handgun calibers are excellent, but they're also fairly old. The newest caliber that's achieved much in the way of popularity is .40 S&W, and even that one seems to be on the way out to some degree.
There are some other great handgun calibers out there that just haven't gotten the same traction, which is kind of unfortunate. There are some great rounds that just don't get the same love as .45 ACP or 9x19mm that merit looking into.
The .38 Super: The Original Plus P Round
The .41 Magnum: Arguably The Perfect Manstopper
The 10mm Auto
9x23mm Winchester
From Russia With BOOM! The 7.65x25mm Tokarev
.327 Federal Magnum - King Of The Compact Magnums
More:
http://gunbelts.com/blog/overlooked-handgun-calibers/