Yup, the Cornelius effect from Planet of the Apes. That's the tendency for any sound scientific idea to be roundly rejected by the political powers that be.
Don't think I can even spell Coreolis Effect properly.
An often forgotten element of barrel dynamics is recoil torque as applied to the rifling twist. As the barrel is hummin' and wigglin', there's a bit of a itsybitsy twist as the bullet gets rotated in one direction and the barrel starts to move in the other. Kinda like your muscle car being rocked opposite the engine rotation when you rev it.
Even stiff Varmint barrels have a bit of barrel whip. Launch the bullet so it leaves at the high end instead of the low, and you'll have a change in where the group centers.