that you stay sub-sonic or if you go super-sonic you do it by enough of a margin that the bullet/pellet is still super-sonic at impact. The transition from super-sonic to sub-sonic velocity perturbs the flight of the projectile as a result of passing back through its own shock wave. A good example of this is a 40-grain high velocity .22 rimfire. They are wonderfully accurate to approximately 50 or so yards but much farther and the accuracy degrades. On the other hand a standard velocity round will out shoot a high velocity one even though it suffers from a more arched trajectory.
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