if you gonna use a shotgun, pick the shotsize you use carefully. you dont wanna use too small of pelletts o there will be no meat left in the thing it will all be shreded. if you use too big of a shot then there will be no squirrel period.
like the one man said up above. i wouldnt let the kids use a .22. even though it is a smaller bore than a 410 the bullet travels about a mile and a half actually. whereas a shotgun looses almost all of its power at about 150 yards.
happy huntings
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I can do all things through Christ which strengtheneth me
Phil 4:13