There had to be some method to their "madness" because their 26 Nosler is twisted 1-8" so I'll just assume they went, for the most part, with SAMMI specs. Why else would you twist a 7-08 in 1-9 ish, a 7mm Mag in 1-9 ish, 280 in 1-9 ish and then twist the 280 Ackley in 1-10" ?