on the few loads I tested, everything was consistently 50fps slows through the 929 than it was through my wife's CZ. If you are barely at minor my guess is the 929 is not making minor.
However, keep in mind that revolver velocities are already very "specimen-specific." You often see very different velocities from identical guns, depending on barrel wear, cylinder gap, etc.
So Sean's results with his particular 929 might be 150fps different than the next 929 off the line, not to mention what you might find in comparison to the various autos.