Yeah, it takes a lot of velocity to make up for 1" of twist. Need 400 FPS more to make up the difference between an 8 and 9. Need 2,300 FPS to get there with a 14.
8T @ 3,000FPS = 270,000 RPM
9T @ 3,400FPS = 272,000 RPM
14T @ 5,300FPS = 272,000 RPM
- DAA
