I have to disagree with "the chamber thing". A competently reamed "match" chamber doesn't care what brand of ammo is fed into it. A good barrel that is properly tuned shoots good lots of ammo very well. When you forego the tuner, good lots of ammo can shoot poorly, and this is simply due to incompatibility of the load to the naked barrel. It cannot be assumed that "good" ammo, like Center-X, will shoot well in a random, naked barrel rifle. That particular lot may not perform well, either because it is a poor lot or as previously mentioned, it does not suit the barrel. If one were to test 2-3 dozen lots of Center-X, surely at least one of them will give excellent performance. Yet, such availability of ammo is not so generously afforded to us here in Canada, so, "you pays your money and you take your chances".