Author Dave Emary Replies:
For a common denominator, I compared cartridges loaded from the factory. The .260 Remington has the same problem the .264 Win. Mag. does: It has a 9-inch twist, and this limits what you can shoot from it. Under the right conditions, you could certainly get fine accuracy from the .264 or .260 with a more aggressive bullet than a 140-grain flat base. But you can’t count on that under the extremes of atmospheric conditions. With cold, dense air, you probably wouldn’t be getting the best groups possible. The 9-inch twist also limits bullet weight. I could just as easily have compared things with the 147 ELDM from the Creedmoor, which the .264 won’t stabilize at all.