Maybe you already have done so,,but take the barreled action out of the wood and look over the underside of the barrel for any markings. Sometimes you'll find a caliber, date and even a gunsmiths name on the bottom.
Short of that,,the advise to make a chamber cast is the best. Then carefully compare to known data to determine what you have.
A chamber cast can reveal the throat dimentions and the bore/groove also all in one cast.
Even after determining caliber, make a careful check of headspace. Custom barreled guns were/are often barreled and then chambered using nothing but empty cases as headspace gauges.
Even with a bit of excess headspace, carefull reloading techniques can overcome that and taylor the brass perfectly to the chamber.
Make sure the '03 action you're dealing with is a later one and not a low#.
Last edited by 2152hq; 03-21-2010 at 09:26 PM.
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