Are you planning on shooting it or hanging in a museum? What you call wear sounds like character to me. Look at the wear on the stock and the metal and reflect on the times your grandpa drew that gun up to his shoulder, the deer, doves, or pheasants that appeared at the end of that barrel. The chill he felt when the cold stock touched his cheek. The pride he felt the day he walked out of the gun shop with his new Remington cradled in his arms. Why would you want to wipe those memories off such a storied piece of your grandfathers life? Though you may never know the details of every nick,scratch or dulled spot on the finish you can touch them knowing that those are memories your grandfather is sharing with you. It sounds like he's left you a little room to add your own memories to pass along some day.