The eddy in the current of air, IOW, yes?I'm an engineer and studied fluid dynamics...
When the air flows on the boat tail, it exerts a tangential force "forward" on the bullet.
With flat base bullets, there's not that tangential force benefit.
Visualize air pushing from the sides of the bullet towards the middle at the base.
Yes. Think of the trailing edge of an airplane wing. When air flows over the surfaces, there are speed /pressure differences, and results in "lift forces". With a bullet, you get a linear force benefit / and we shooters get the benefit of "retains velocity better".The eddy in the current of air, IOW, yes?