I have to agree with ribbonstone and Mr Gates. The market is driven, not pulled. The superfast round does have the advantage of flat trajectory, but I have to temper that with a few facts:
1. It consumes more powder.
2. It will cause more wear in the barrel.
3. It will shorten your case life.
4. The round will be "inside" the target area for a shorter peroid of time. (When the round passes all the way thru)
5. The longer the bullet is inside the subject, the more energy it will absorb from the bullet, thus increasing the shock load.
I could be wrong, but I have shot some fine loads that were sloooooo.....

1. It consumes more powder.
2. It will cause more wear in the barrel.
3. It will shorten your case life.
4. The round will be "inside" the target area for a shorter peroid of time. (When the round passes all the way thru)
5. The longer the bullet is inside the subject, the more energy it will absorb from the bullet, thus increasing the shock load.
I could be wrong, but I have shot some fine loads that were sloooooo.....