Like others I used to shoot their .357 Sig as it was the cheapest around. Have shot some of their 5.56/.223 in competition with good results also. While I have some of their .308 I have not shot any as of yet, sorry.
if you are considering remanned ammo, check out Freedom Munitions: http://www.freedommunitions.com/In-Stock-Now-s/53970.htm
I've shot a lot of their 9mm and .223 and I don't consider it dirtier than any other manufacturer (like Remington, Blazer, FLC, Wolf Gold, etc.)
Hopefully the .308 would be similar.