If you think the .264 has more "bark," you probably wouldn't like the 26's bark (or the 6.5-.300 Weatherby's, since they get basically the same ballistics, with similar powder charges.)
I have only been around two 26 Nosler rifles, and neither was finicky: my Nosler Liberty model, and a friend's Browning X-Bolt. I'd had my Nosler rifle for several years, and any bullet in the 140-grain range shot VERY well with a maximum charge of US869. Lighter bullets shot well too, but don't remember the details, though could look them up.
My friend asked me about loading the 26, and I told him the above. He tried US869 with 140-grain Ballistic Tips, and the Browning shot little bitty groups. He used it last fall to take a big mule deer buck at around 450 yards.
