I've shot skeet for years. I've learned most folks think shotgun pellets fan out quickly. True enough when shooting clays or birds, but the pattern of most any shotgun within 25' (a big room in a typical home) is about the size of a softball.
Birdshot or buckshot, the bad guy won't have wounds all over his upper body when shot at close range. There will be one awful hole surrounded by a few stray pellet holes.
Few people die from being hit with birdshot.