The most fun I ever had chasing squirrels was with my .36 cal. long rifle. I'd use 25 grs. of FFFg behind a patched 000 buckshot, and head shoot them only. A friend gave me a bag of them he had bought bulk and, as I recall, the buckshot measured about .350". With a good , thick pillow ticking patch they shot "minute of squirrel head". But, with .355" cast balls and teflon coated ticking that little gun is a tack driver.
Very satisfying and relaxing.
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