I have a cooper phoenix on the way in 6.5x284. I am buying it from a gentleman who shoots F-class. The gun supposedly shoots best with 139 scenars. "1/4 MOA" I understand that these aren't what you want for hunting. I will be shooting less than 600 yds. Realistically less than 400 99% of the time. What bullet would you guys recommend for 100 to 180 pound whitetail? Also any load information you might find useful would be greatly appreciated.