Actually, I believe that would be squirrel burger...You want to be at least 10 yards or you will make them into hamburger.
Shotguns on squirrels aren't much of a challenge.
Full choke, no.6 shot. Anything smaller and it is a headache picking shot out of the carcas. No. 6 seems to mostly penetrate to the off side and the shot falls out when skinning.
Thats what I use and can hit them in the head at 30 yard and body from about 60 before the pellet starts droping or use a .22LR but they wast to much meat and theres not much to begin with.