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I use combination guns a lot, but to get a decent one they can be spendy. Savage 24 work alright if you can get away with open sights, put a scope on them and they get very awkward. It really sounds like a pump shotgun with a spare rifled barrel would be what you are looking for. A Rem 870 with a spare slug barrel and cantilever mount would work great as you can leave the scope or red dot on the barrel and put the shotgun barrel on for grouse and ducks.Drilling 16ga x 16ga x 6.5x58R Sauer that I use for coyote hunting. I bought it as a non functioning wreck and spent a year repairing it and finding ammo.O/U Combination in 12ga x 5.6x50R Mag