A .223 would make a great range gun but as others have said it is marginal for deer, and the one you are looking at probably has a 1:12 rate of twist. As others pointed out that means it would probably shoot lighter bullets the best and that would make it even less desirable to have for deer.
If you plan to use this gun for deer and the range then go ahead and get a .243. The .243 is light on recoil and still fun to shoot at the range. It will also be much much better for deer, and you won't need to worry about the rate of twist in the barrel. Any off the shelf .243 would be fine. The only down side to the .243 is that the ammo isn't as cheap as .223 and you won't be able to get cheap surplus ammo, but with the rate of twist that barrel probably has you wouldn't be able to shoot surplus ammo very accurately anyway.
A know several people with .223 bolt actions and they are fun to shoot. They are great range guns but that's about it. They can be used for varmint like ground hogs and coyotes, but we don't have any ground hogs around here and not many people here hunt coyotes. We have tons of deer but I don't know anyone that would use a .223 for deer, and most of our deer aren't very big either - at least compared to deer in the midwest and the north.
Just my .02