Look at the savage bolt action slug guns. Everything I’ve heard about them is positive. They have rifled barrels and should give you centerfire-like accuracy out to say 200yds or so.
Shooting deer with pistol calibers wouldn’t be my first choice.
Congrats. A good scope and mount is more important than the gun it is mounted on. It doesn't take fine accuracy and three thousand pounds of energy to take out a deer's lungs.