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And all the while they are having quality time with dad and learning lessons that they are not likely to ever learn at school

Classic

Damn and here I was thinking that someone had knocked the assumption out.

Something good that he will probably start himself with your grand kids

Mucko I am with you on that. Make it fun and make it safe with good supervision and there isn't much you can't give kids a go at!

What did I say? Told ya

Oh don't do that POME. A woman will just confuse your thought process

POME with good attention to safety, I would think that your four year old would be fine. Make it fun though as that will increase his attention span.

For standing unsupported maybe Gibo but for shooting prone off a rest .... well you never know until you try