maddog,
This week I have been getting ~ 1 squirrel per day with the 45/70 handi rifle 1 gr Red Dot 150 gr .458" cast with Aluminium spacer. 400 fps sounds like a BB gun. I developed this for getting raccoons with body shots, but it only works from the side through the ribs. I can't get though a 10 pound coon's front shoulder to the vitals with sub sonic gas escapement loadings. But it has all kinds of penetration for 1.5 pound squirrels.

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There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. -Ernest Hemingway
The man who makes no mistakes does not usually make anything.-- Edward John Phelps