Because it comes in bloody handy !
Well was walking through 1 of my woods this morning to check on the pheasant pen, when a saw 3 crows sitting on a dead elm, 1shot 2 then 3 all crows dropped , was a parent and 2 young. After the shots a heard something running through the ferns, out popped a fox in an opening , first shot missed second shot nailed it, but needed a third to finish the job, so 6 shots fired. Couldn't have done that with my over n under.