Ed - I understand it is the long pointy high velocity bullets that are disrupted most passing from super sonic to sub-sonic speeds.

The least effected, is a round ball. As the length, shape and speed change, the more they are disrupted.

Case in point, is my RBlock in a heavy barrel .50 Alaskan chambering. With black powder loads being shot over a 200 yard range, they go from super sonic to sub sonic, yet with tang mounted aperture and globed front sight, it shoots better at 200, then at 100 meters using a flat nosed 550gr. bullet. At 100 meters, it runs 1.4 MOA, but at 200 meters, it's down to .7 MOA.(1 1/2" for 5 shots, both ranges - 109yards per 100 meters)