My Dad died when I was six and I never hunted or fished.
Then I got married and learned a lot from my Father-in-Law.
For Squirrels we always used Shotguns in the Walnut and Oak Tree areas on family property.
We'd kind of stalk, walk slowly awhile and sit for awhile.
Squirrels always seem to rum to the opposite side of the Tree.
When we spotted a Tree with squirrel or two, we'd tie a string to a branch or bush where we were standing.
Then slowly walk to the other side of the Tree and so would the Squirrel.
After sitting in a firing position for a while we would tug on the String shaking the Branch or Bush at the other end.
Then the squirrel would always come to our side of the Tree and Blam.
I use a 10/22 for Head-shots now, as I don't like chewing Lead Shot missed when cleaning.
Without ammunition my guns are merely finely machined, well oiled clubs.