My thoughts:
My understanding is that scout scopes have a medium relief.
Scout scopes are generally around 3x and made for quick target acquisition.
A scout scope may fit your rifle relief better but you will likely be limited by the power.
A pistol scopes have a longer eye relief and would have to be placed pretty far forward on the rifle to work, maybe too far forward for you rifle.
You also might want to investigate the scopes' parallax. I believe (but am not sure) pistol scopes are set for 50 yrds, while rifle and scout scopes are set for further distances.
I don't know much about shotgun scopes, so I can't help you much on them.
I'm also not sure about the construction of scopes. Are shotgun, rifle and pistol scopes constructed differently to handle the different types of recoil (i.e. is a pistol scope constructed to handle rifle recoil characteristics?)
H.