Excuse me if I am interupting but I have a follow-on question to BullDogs original note. If the intent is to achieve a SF of greater than 1.5 then why not simply obtain the smallest twist rate available? Specifically, on a 470 I can get a barrel with 10", 16, 18 or 20 (and more) from several barrel manufactures. Why not simply choose the 10" with a SF of approx. 30? What is the downside that I am missing?