While I have a 270, 30-06, 7MM Mag, and a 300WinMag, I am unsure which will be the best for me to use this fall in Colorado on an elk hunt. From practice, I am equally accurate with the 7MM and 30-06 to 300yards. What would be the best load for either caliber on ELK? Or should I step up to one of the Remington Ultra-Mags?