If you get the right powder charge behind the 130gr TSX it might be possible to see the 3900 and beyond ft-per seconds.
Super flat and fast.
http://bulletin.accurateshooter.com/...omment-page-1/
Good on you for pushing the limits, a little bit of tweeking to get them going.
Skies the limit for those that choose to push the envelope.
Don
PS: It would be crazy to see the 4300 ft-per second thing as its really clipping along.