Yeah it seems like both gunsmiths and some barrel makers (Kreiger) want you to use a heavier contour. I have found a consistent pressure in that direction when what always makes me happy is a thin contour long barrel. But that took some money spent to find out.
And when ordering a barrel, as mentioned before, not getting a slightly faster twist than normal has made me sad more than once.
Another big mistake I always make is counting on something to be ready when the gunsmith says it will!
