Any new name brand O/U runs in the 1k neighborhood.

For clays? It should be the mutt's nuts. Just make sure you change your choke tubes from Full or Modified to Improved cylinder or less. Cant speak for your dad's ability though. Even a $5k custom made work of art won't help a lousy shot.
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The art of government is to make two-thirds of a nation pay all it possibly can pay for the benefit of the other third.--Voltaire