The drag will be lower.  However, I recall the transition through sonic can be less than symmetrical and so might induce some wobble.

   Actually, Frank, my brother-in-law has his Masters degree in aeronautical engineering and is in the U.S. Senior Executive Service.  He works in the Pentagon and is on the Chief of Staff for R & D.  Accordingly, I have a resource there at my disposal that the U.S. pays big dollars to access.

   Aeronautical components of aircraft flight are much advanced over what I want or need to know about a 200 Grain lead bullet going to subsonic speed.

  I'll just settle for the "it goes wobble" information for the time being.

   Creedmoormatch

If one had access to good computer modeling, it would also be interesting to see the effects of bulelt shape and the resultant variations in the different wobble paths.

Here is a link to an interesting article (You need to Login or Register to view media files and links)
The old wasp-waist bullets were designed to thwart the effects of transitional velocities.  I think NEI might still make a mold for these bullets. I'm not sure.  Back in the 70's Herters offered the wasp-waist for long range shooting and they proved their worth keeping accurate hits after going sonic.  The problem with the bullet is in the seating since it is hard to align the bullet in the case properly and there is little room to adjust the depth with the cast bullet.  It would be interesting to toy around with the bullet design some just to see what it can do.  The above link is very interesting to read and the photo's help to explain the design.