50-300 usd
100-400
Contact Beretta
Check with Beretta Customer Service through their website. The oldest maker of guns in the world, Beretta is still in business.
Contact Beretta, and request an owner's manual. See the link below for an on-line request.
You will have to contact Beretta to find out.
50-250
To determine the exact value of a Beretta Mod A 303, a number of different factors would need to be considered. Some of these things would be the age and condition of the shotgun.
100-300
The best route is to ask a gunsmith for assistance.
Contact Berett for a owner's manual or find a gunsmith and ask for help
50-300 dollars