My break barrel air rifle is a Gamo Shadow in.177 cal and will put 12 grain lead pellets completely through a 2X4 at 150 ft,imagine what it does to squirrels.Pyramyd Air is where I bought my Gamo air rifle and all the other air guns I own.I buy my pellets,targets,scopes and air gun accessories from Pyramyd Air.http://budurl.com/PyramydAir