The reason a S&W J-Frame revolver with a 3" barrel is considered a pocket pistol
is because it's often hard to find holsters for them.
Everyone makes leather for 2 1/8" snubbies but few build them for 3" versions.
A S&W J-Frame revolver with a 3" barrel - makes a perfect Kit Gun.
Simply Rugged makes a fine holster for the 3" J Frame .38 Spec. Here is mine. That's a 3" Heavy Barrel, shoots very well and is mighty handy to carry.
L.W.