should I shoot my old Parker or hang it up

[John Yancey]

Hello all,
I am hoping you guys can help me in making this decision. I just inherited my Grandfather's Parker Brothers 12 gauge hammerless double barrel shotgun and was going to take it turkey hunting later this month. My wife thinks I am crazy and that it should just be insured and then put over the fireplace. Maybe I can do both but I wanted some professional advice from you all first. The gun has the serial number 111880 with the frame size of 1 and a weight of 3^6 and I think the grade is DHE as it has the ejector. All the pieces have matching numbers and the barrel says it is Titanic Steel. It also has a silver plate on the stock with a name engraved on it. My Grandfather received the gun as a gift after helping the original owner out during tough times back in the 1930s. the name on the plate is "P.R. Lilly". The gun has never been refurbished and I think some of the old marks, dents and scrapes give it character so here are my primary questions. 1. What amount should I have the gun insured for? 2. What size ammo can I safely use in the gun? 3. Should I continue to hunt with her or just put her on display?
Thank you all for your advise and wisdom.
John