RE: 300 WSM vs 300 Win Mag vs 300 Weatherby
I'd pick either the .300 WSM, or .300 Wby.
I have a .300 Win Mag and a .340 Wby.
Figure out what kind of power you want, If you want .300 win mag type of performance get the .300 WSM, if you want .300 RUM, WBY power, get the .300 WBY.