If you want both switch barrel as well as interchangeable size bolt faces for 223, 308 and magnum faced cartridges, I'd strongly suggest taking a look at the Bighorn TL-2 or TL-3 actions. As noted above, you can interchange the bolt face without needing an entire new bolt.
The other thing the Bighorn offers is that it uses the Savage small shank thread pattern so not only can you run a traditional shouldered barrel like any other action, you can also use a savage pre-fit if you want to swap in a cheaper barrel for practice use. That avoids the cost of a gunsmith to chamber the barrel, just need a go gauge and a wrench.
The other thought might be that if you're going to run 223 as well as larger calibers it may be better to build on a short action platform rather than a long action, especially if you wanted to magazine feed. You could do any of the short action magnums in 6.5/7/30 to serve as your larger caliber option.
The other thing the Bighorn offers is that it uses the Savage small shank thread pattern so not only can you run a traditional shouldered barrel like any other action, you can also use a savage pre-fit if you want to swap in a cheaper barrel for practice use. That avoids the cost of a gunsmith to chamber the barrel, just need a go gauge and a wrench.
The other thought might be that if you're going to run 223 as well as larger calibers it may be better to build on a short action platform rather than a long action, especially if you wanted to magazine feed. You could do any of the short action magnums in 6.5/7/30 to serve as your larger caliber option.