Hello Folks,
In 1991 my father passed away and left me his L.C. Smith 12 ga double shotgun. It was made in 1949. I've always cared for the gun as a treasure, but lately have been thinking about shooting it more. It has 30" modified and full choke barrels. If I were to load some round-ball ammo, what diameter balls should I use? Would lubricated patches lessen the chance of damage to the chokes? Is this a bad idea for a gun that is priceless (to me)? Thanks for your help.

Take care, Tom