A little off your exact question and just a thought, you mentioned "shotgun/muzzle". Although every one's posts are correct in that the rifled barrel is more accurate, have you thought about buying a muzzleloader instead? You can get into the sport for near the same cost you are going to drop on the new barrel and the scope cost is the same for both. In Michigan, Muzzleloaders have their own season and extend the hunting season. With practice, they are accurate out to 200 yds, but you have 1 shot. If Texas allows for extended hunting and you like range time, a muzzleoader may be the way to go as it extends your season, can be just as accurate as a rifled barrel and gives you an excuse to grab another gun.