RE: 223 or 243
Good news! You have a Savage. You can convert it to a .243 with nothing more than a barrel ($120), barrel nut wrench ($20), bolthead ($30) and a couple of headspace gauges ($30). After you invest in the tools, you can then use the same tools and switch it to 7mm-08 or .308 for just the cost of a barrel. Tkaes less than 30 minutes to do the swap.