To answer the topic question, yes. Depending on the features of the body, you can get locally-supersonic flow in the trans-sonic regime. For the subsonic round, it looks like the flow needs to accelerate to dip down into the cannelure and then decelerates back to subsonic, producing the shockwaves normal to the mean surface.
Depending on the features of the body, you can get locally-supersonic flow in the trans-sonic regime. For the subsonic round, it looks like the flow needs to accelerate to dip down into the cannelure and then decelerates back to subsonic, producing the shockwaves normal to the mean surface.