I want to build a very accurate 2 - 600yd deer rifle. I am considering using one of these rifles I already have. 338 WM, 300 WM, 300 WTHRBY. The other option is to buy a new caliber (possibly a wsm) to build to be a custom hunting rifle. I have been using 30 cals pretty much since I started hunting whitetails (14 years) so I am comfortable with them and like the stopping power. As of now the 338 is defiantly my favorite rifle (model 70). The others - 300 WM ruger m77, 300 weatherby mark v. 300 yd shots are pretty much the norm where i hunt in ND nothing but miles and miles of rolling plains. Any suggestions are appreciated. Keep in mind this will also be a "hobby rifle" and I plan to reload ammo for it as well.