What is a 223 WSM going to do for you that 223 Rem won't. You are setting yourself up for hard times. Several years ago I bought a 300 RUM. No internet retailers had the 300 RUM for sale. I had to drive 3+ hours, spend $40 for 20 rounds, then drive 3+ hours home. None of the guns stores in town would order the ammunition for me because they had to buy it by the case. I buy 223 Rem for $18 for 50 rounds of ballistic tips. I priced 223 WSM on Midway (only three to choose from by the way) the cheapest they have is $17 for 20. Why do you want to pay twice as much to burn out your barrel twice as fast.If a 223 Rem does not cut it for you in performance why not step up to a 243 Win? The 220 Swift and 22-250 are fine for what you are trying to go after. I would chose a 22-250 rather than a 220 Swift though. There is nothing wrong with a single shoot. By design they are very strong, accurate rifles.

If you want something new and hot, try a .17 HMR. The ammo is not as cheap as a 22 LR but offers alot more in performace, and are good out to 200+ yards.