The best place to get shot by a gun is the Legs, Arms, or Butt
No just the arms.
Old catalogs and gun books would be the best place to find them
There is no "best gun", even tough the shotgun does have a one shot kill ability.
See a doctor.
Single shot 12 gauge.
the best gun is the m1 garand 1 shot kill
Most folks use a 12 guage shot gun.
The least painful place to be shot is on the toe of a steel toe boot. Without clothes or accessories, the best place to be shot is on the side of the hip.
Head or Heart shot
the remengtion 870 express mag 12 gauge
best left to a gunsmith
Single shot bolt action .22 rifle.
Blue Book of Gun Values is a good place to start.