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[Dan]

There is that, granted. In referring to GG vortex I was looking at the premise in context of parasitic drag on the shank rather than the, uh, tailgate? Now if we could get rid of the tailgate on bullets we'd be on to something. :-)

Parasitic drag is an issue of friction where induced drag relates to cross section area. There is a good reason aircraft designers began to pursue laminar flow airfoils back in WW2. Surface/skin turbulence creates a lot of friction/drag. A bullet comparison would be wad cutters versus spitzers. The very concept of VLD bullet nose design rests upon minimized turbulence above the boundary layer flow field.