John,
As you know, I don't know squat about rifle stuff.....Why is the copper Barnes X better than the copper GMX?.....Does Barnes have it available on a factory load?
Yes Barnes Vor-Tex is a factory loaded Barnes TTSX offering. And copper is no different than lead when it comes to bullet manufacturers. They all have performance characteristics. The GMX tends to be more finicky regarding accuracy and does not have the explosive expansion that the Barnes "X" does. My observations are base on personal experience as well as discussions with many customers.