I would suggest taking up archery as a hobby.
I too had some problems with these pesky varmits
I found that blunt tips will not kill but they do give a nice spanking. I very seldom see squirrels around any more.
As a nice added bonus, I can now put 4 arrows into a tennis ball at up to 50 yards. So, if you ever have any rabid tennis balls giving you grief, just give me a shout!