Have a lightweight mountain rifle in the works. Looking at running about a 24" barrel with a 700 action. Be used for mulies, antelope and possibly coyotes from time to time. Want a caliber capable of long range shots out to 800 yards or so. Looking at the 25-06, 6.5 rem mag, 6.5x284 or possibly something bigger with a as I want this lightweight. What's everyone's thoughts and opinions on a caliber