My squirrel rifle is a CZ 452. But I haven't gone this year. I have been shooting enough off my bird feeder in the yard with a Benjamin 22 Air rifle to keep a constant supply for eating. I bought it a couple of years ago and put a Williams aperture sight on the back of it. My best day this year I got 5. I used to use CCI CB shorts out of a Savage Mark II but I can't find them anymore.
Sometimes a Ruger 10/22.
But mostly my all time favorite, a custom Marlin model 60.
And for a sidearm. In case of massive squirrel attacks. A Ruger standard markll 4"
Always save one bullet back..
Just in case.