Just go into the game and shoot some walls. It leaves marks where the shots hit, and you'll be able to observe the way the range and spread works yourself :D Even count the number of pellets in a shot.
but what if im shooting a wall across the map? will it go that far? or spread so much it hits walls to the side. --- The Conduit: 4425-9297-5799 -Zane "I've never in my life wanted to punch a girl like I want to right now." Light Yagami