Use the most accurate pellet you can get in your gun. Almost certainly a domed pellet, you do not need the terminal effect of HP at 15 yards on a squirrel, accuracy, at a very small kill zone is best, and HP are not known for accuracy!
As for the best way to hunt, as we have discussed ..there isn't a best way, all land and circumstances are different and so different approaches work better in different situations!!
AA Field 5.51 Domed took this lot...
did you eat all those tree rats?!