QUOTE UncleNorby: A barrel can only impart the twist it has to the bullet (twists per inch or travel). Increasing the powder charge will generally increase the velocity, but will not change the number of rotations the bullet makes as it travels over a given distance.
QUOTE Articap: I disagree because I believe that the RPM's are increased after the bullet exits the barrel when loading with more powder and velocity instead of less.
I'm not a physicist but I once slept in a Holiday Inn, and still don't know which is correct. I'd sure like to know. Can either of you prove your view with an authoritative reference?