I have several "J" frames with longer than 2" barrels. Here is my 4" Model 631 (.32 H&R Magnum). It is a FINE edible small game revolver and would not be bad for a defense gun against feral dogs and two legged dogs, if necessary:
Here is a MOST useful field revolver that I often used as a side gun when bird hunting with a shotgun - my 60-4 with 3" full underlugged barrel and adjustable sights:
I also have a classic "Kit Gun" with 4" barrel in .22 rimfire but MUCH prefer the centerfires for field use.