I am building a 6dasher and would like some help choosing a barrel. I found a Criterion barrel that has a neck diameter of 272 and a freebore of 104. It is a stainless 28" matchgrade barrel. I also found a Shilen barrel that has a neck diameter of 272 with a freedore of 60. It is a 26" stainless matchgrade barrel. The shilen can be sent in with two dummy rounds loaded at the depth that I want and they will adjust the freebore accordingly. Unless the Shilen is going to be better I'm thinking of getting the Criterion. Comes ready to go and I don't have to send it in to get the freebore adjusted. Both barrels are new. What you think?