Well, he's partly right. A 1-12 will handle most lead-cored bullets up to 190 grains, but it's right on the ragged edge of even stabilizing at all for a 168 Tipped TSX in colder Texas hunting temperatures, say 25 degrees. And in a 1-11 twist a 190 Berger VLD will be leaving some of its BC behind at that temperature, even if it's very accurate, so would be more susceptible to wind-drift.
So whether the OP is shooting deer at "normal" ranges with something like a 168 Tipped TSX, or wanting go longer with a Berger VLD, a twist slower than 1-10 isn't any advantage.
Have you read any of Litz's research?
