Probably 24", maybe 25". A heavier barrel is usually needed to get the same sort of accuracy from a 26" versus a 24".
One of the things I've noticed about the 26 case that apparently it will clean up a .264 chamber, which is no doubt a smart move by Nosler. And I have a Ruger Hawkeye with a 24" 1-8 barrel that shoots very well....
