TXRam,
Aside from the specific bullet that will stabilize in a given twist rate not being dependent on the twist rate, even the people who devise twist programs admit they don't predict everything.
One thing apparent from the JBM program and the one on the Berger site (which are based on the same calculations) is muzzle velocity doesn't have nearly as much effect on stabilization as many people used to believe. As an example, I've owned a .22/6mm with a 1-8 twist Brux that didn't shoot a 75 A-Max nearly as well as .223 WSSM with a 1-9 twist Lilja, when the bullet was loaded to the same velocity in both rifles--and both rifles exhibited the same level of accuracy with other bullets.
A lot still depends on chamber, throat, bore and other stuff specific to the individual rifle.
