I prefer something in between the 9mm and 40 S&W............... 357 Sig. A 40 caliber case with a 9mm projectile, what's not to love.
I like .357 Sig, and carry a Sig P229.
I have the .40SW barrel for it too.
I prefer something in between the 9mm and 40 S&W............... 357 Sig. A 40 caliber case with a 9mm projectile, what's not to love.