Re: I ordered an 11'' twist .30
IMHO the 12x will handle the 190 just fine. This has been proven mathematically AND in the field. A very reliable twist/stability factor calculator shows over 1.4 gs. This is plenty. Berger Bullets recommends the 12x for their 190's which are longer than the SMK.
I use to run the 200 Nosler ACCUBONDS in my 300 with a 12 twist with 1/2MOA accuracy and never showed any signs of instability. Even in cold sea level air. You will need an 11x for the 208-210 grain pills.
That said, I would be pissed that I spent what we spend on barrels and got one that did not match the specs that I ordered and would demand an exchange. But that is just me.
Long range shooting is a process that ends with a result. Once you start to focus on the result (how bad your last shot was, how big the group is going to be, what your buck will score, what your match score is, what place you are in...) then you loose the capacity to focus on the process.