Beretta's usually have tight bores and medium length cones. They can be hard to lengthen because of the chrome plated barrels.
The age of a Beretta cannot be determined by the serial number but on the underside of the barrels/chamber you will see a series of proof marks. Near the proofmarks you will see two letters beginning with A or B. These correspond to years of manufacture. Anything beginning with A is 1990 or before, B indicates more recent manufacture. The precise year can be determined with both letters. Both letters will give you the precise year. If you post these two markings I should be able to find the precise year.
In any event, Beretta switched to the Gold series in the late 90's. They are great guns. I use an older 682 for skeet and sporting and it's a real workhorse.