Indiana is a Bow, Black powder, pistol, or shotgun only state. I hunted with a 12 gage for years. I would never take a 100 yard shot with a slug, too much drop. Most of our shots are 70 yards or less. If you get good at 25/50/75 yards with a 12 gage and a slug you will have no problems.
I know the feeling when it comes to rifles and long distance shots, I shot in the Marines for years and was a PMI instructor for a while. The thrill of called in buck from 25 yards is much greater than a silent kill from 200 yards to me any day.
Hope you enjoy your shotgun days,
If they have muzzleloader season there check into some of the new inlines. They can reach out a little further also.