Nothing at all wrong with a straight .243. It's my 6mm of choice.
How much barrel life are you getting Rob?
Ding, ding, ding, we have a winner!
Barrel life was the main reason why I went with the 6XC. Not to mention the facts like: quality brass is avalable without fireforming, its as easy to load for as 308, it feeds flawlessly in AICS mags, 3,000 fps it easily acheived even in 25" barrels and it's as inherently accurate as anyone needs to be.
I couldn't be any happier with my "Crusader-esque" 6XC that Moon built for me two years ago.