I think your making a wrong decission go to Federal ammo Balistic tables and take a look at 140gr BT Nosler load in both calibers the wsm is a better cartridge, I like making up guns and load for them and from my experance the short stubby is the way to go. Look what happened over the years.with those short stubby cartridges 6ppc the deuc is history,
.284win is tacker and also the 6.5/284. go to shortmags.org and see what these short mags do in factory guns, amazing cartridges
I had700 action made up by Hart in7mmwsm 24" barrel 6.7 lbs total weight and it shoots .125" unbealivable for such in a hunting gun.and I can get 3300fps 140gr Lost River Bullet, thats only 175fps behind the 7mm Rem Ulta Mag, with almost 30% less powder and a lot less recoil.You can get a lighter,quicker gun by going with short action gun.
Give it another thought, you won't look back with a short mag.