RE: 30-40 Krag sporter---to scope or not?
Well, I guess you would have to ask yourself if your grandfather would of wanted his guns to be usefull to those he left them to or if he would of wanted them to be kept as they were and to put away.
If you had a scope mount that required no permanent defacing, then I don' t see any problem that can' t be fixed with a little polishing. But if it were me, I would shoot it the way he did with the iron sights, and take the 06 with you. That way if a deer walks out at 100 yards, you can take it with the iron sights (its alot easier than you may think to hit a deer with sights) or if like you said, you can use the 06 and smack a big 10 point on the back of the field.