The 6.5 RPM has more case capacity than a 6.5-06 Ackley. So it will yield higher velocities. The 6.5-06 AI is a good cartridge, but you can’t say this is a bad one. It has .264 Win Mag ballistics in a non magnum action without a belt. You will also be able to buy factory ammo, rifles, and components for it without having to fire form or custom order equipment and components. I think it’s a great cartridge. It’s a step up on the 6.5x284, 6.5 PRC, and 6.5 SAUM. I think Weatherby is waiting to get their new lightweight rifle, chambered in 6.5 RPM, on the market for a little while. Then I think they’ll start building Vanguards in this chambering and offering more for it. I can see other manufacturers picking it up as well. Other than the .264 Winchester and the firebreathing 26 Nosler and 6.5x300 WBY, there’s no other commercially available 6.5 at this power level.