RickF that one will happen if I ever build a rifle, with a 1 in 12 twist too.
The Norma is great, but no question when you can buy a factory 338 it's easier to go that way.
My Norma is a 12 twist, but I don't need it as I when I shoot it in anger I use the 225TSX. The 12 twist is fashionable so we can shoot the true heavy weights but I don't have much use for 300 grain bullets!
I think a 14 would be plenty, and may well be more accurate with lightweight lead and jacketed pistol bullets.