Yeah. All I know is that there is some aerodynamically funky stuff that happens when the bullet passes through the "transsonic" region (mach 0.8 to 1.2) that serious messed up the flight of rifle bullets. Apparently, the same bullet would be perfectly stable and accurate both above mach 1.2 and if fired below about mach 0.8, but the transition somehow wrecks any accuracy, but I've never found an understandable explanation of why.

Mike