The 6 ARC is a great idea. But unless you feel like you gotta have factory brass and dies the 6mm AR / 6mm Predator / .243 LBC has just a tad bit more to offer due to case capacity. It really doesn't amount to a hill of beans, though. I bet you'd really like it.
In truth, I don't think the barrel you have on there shoots bad at all.
Thanks riverrider. I currently have a 6WOA that is ballistically superior to the new ARC, if it were twisted right and had better support from WOA. As it is, you dont have a good selection of dies, brass, or load data. Hence the reason the 6mm ARC will ultimately be the demise of some of these similar "better" wildcat cartridges.