Someone in your family had good taste Benjamin.
It should be marked 'Field' in script on the top of the R barrel.
The 'R' prefix indicates a Regular frame action.

The gun was made 105 years ago and should be evaluated by a double gun specialist before use.
The good news is that the chambers (unless otherwise marked) are 2 3/4".
If the smith finds that the gun locks up tight and the head of the stock is free of cracks, certainly todays 1 oz. at 1200 fps target loads would be appropriate. I would not use today's turkey boomers. And NO STEEL.
The smith can measure the choke constrictions which Hunter Arms did not mark.

Please look around the FAQs for lots of information
https://lcsca.clubexpress.com/content.aspx?page_id=274&club_id=43784