well I will say this, welcome to the site
But I do hope you know, it MIGHT be Illegal to be shooting squirrels in your back yard
and it most likely is also illegal to be disposing of them in the creek near you!
there are typically hunting seasons ONLY on them and limits, and locations where they can be hunted?
Your feeders trying to attract birds are what is also attracting the squirrels, , sadly you cannot have your cake and eat it too
I would highly suggest maybe investing in a live trap, real easy to use, work super well
catch one
take it for a drive and release it else where and repeat as needed!
way better than killing things for nothing and could also save you from some pretty high fines if caught!(again, DON"T know where your at to say for certain or NOT if Illegal)
NO bashing here just being honest with info and advice!