I would recommend getting the .300 WM. It will kill almost everything in North America. To make up for the weight penalty, I would opt out of getting a Vortex which always 50% heavier than similar scopes. I would suggest looking at the Swarovski Z3 line or Leupold VX3-HD or VX5-HD line. A Vortex will weigh about 23 oz while the others will weigh about 14-16 oz.