I am torn between calibers. I will start by saying this rifle is intended for carrying so weight is a facter. In addition I intend to use this rifle for elk sized game inside of 1200 yards. That being said most of my shots will be taken between the 500 to 1000 yard range. I have experience in longrange hunting with a custom 6.5-.284 I had built off of a Rem. 700 action and Shilen barrel (to heavy to carry). Anyways, here are the choices...Weatherby Accumark in .338 Lapua, Remington Sendero in 300 RUM, or Remington Sendero in 7mm Rem mag. Help me out with your thoughts backed by any data that is relevant.