You should wait until X-Caliber has a sale. I'm probably going to order another 12T 6BR barrel from them during their next sale.
I have their 12T 6BR barrel that I've been using working with AR Comp loads. There's a thread on that. They don't have many freebore choices though. Their 6BR chamber has a 0.271 neck and 0.94 FB.
It is not the same.I have about four of their barrels, but bought them when the original owners and smiths were there and they have and are working great.
Don't know if quality is the same now with new management and all.