How about another Combination gun? In Germany we call them "Bockbüchsflinte"
They have a shotgun barrel over a rifle barrel.
They come in various Configurations:
Like .308&12/76 or 8x57IRS&12/76
Or like the pictured Gun (Blaser BBF95) in 5,6x50R Magnum & 16/70 wich would make it a great gun for smaller spiecies.
The 5,6x50R Magnum is a bit more powerful than a .223 and in germany legal for roe deer.
For suggestions to a classrange this would be suited i'd be thankfull