RE: Shotguns with rifle barrel new addition
My choices are:
Savage (not sure the model) bolt action, Marlin model 512, Mossberg bolt action (not sure the model), in that order. Browning makes a bolt action too, but they are more expensive. I think these are all out of production,except maybe the Savage. You should be able to find them used or on the internet.
These would be dedicated deer guns, can't switch to a shot barrel.
After that, you're talking pumps or single shots.