i have used a single shot .410 for a couple years as a squirrel gun but find that shooting towards the tops of trees is next useless. it just doesnt have the shot power/grouping to kill something that high. shots on low branches or jumping squirrels are great though and the .410 is a great shotgun to shoot. normally i'll take the .410 and a .22 at the same time for squirrel.

around here i have no problem finding cheap shells.