I am going the other way and eliminating some overlap, so your dilemma in reverse, as others have mentioned a 300 mag, 338 mag, 9.3x62, or one of the 375s could work for you. I could not decide on whether I would eliminate my 300 win mag or my 338 so I listed both and will keep the one that doesn't sell. I am keeping my 375 Ruger[stainless] as I have components and I am keeping my 9.3x62[wood and blued deluxe Husky]. It might be a better idea to make a short list of cartridges that would suit you, then look for a rifle that you like, chambered in something from your list. Your list could be a lot longer than what I have listed here. I don't shoot anything a .223 is good for, so I don't own one, I have a 9mm pistol carbine and a couple of .22s for my Wife and I to have fun with. I also have a .270 I like and a 7 08 that I occasionally borrow from my Wife. As others have said you could replace everything with a 30 06 for North America, but for me that is boring.