Re: 6.5x284 vs 7mmWSM
Unless you plan to shoot 1,000 's of rounds per year, the brass cost should not be the deciding factor. Since you are planning on a single shot, feeding is no concern. (I have serval WSM's and all are a little difficult to chamber the sceond round). I think if you are going to muzzle brake the gun get the 7WSM, if not get the 6.5X284. If you want a lighter barrel on the rifle I would choose the 6.5X284. Either should serve you well, but for 1,000 yard kills I would prefer the 7WSM!