I think the intent of the article was if you could only afford one rifle to hunt CXP2 game{pronghorn,whitetails,sheep}to CXP3 game{elk,moose}along with some european and african counter parts he listed 4 calibers that could do it all.You could pick any one of the 4 and be able to hunt anything except dangerous game.At least thats what i got out of the article.