You picked up some Barnes TSX to feed it didn't you? Did you ever get load data for it?

You can snag a PDF from Barnes if you need it.

http://www.barnesbullets.com/wp-content/uploads/2010/01/264WinchesterMagnum.pdf

“There are three things all wise men fear: the sea in storm, a night with no moon, and the anger of a gentle man.”
― Patrick Rothfuss, The Wise Man's Fear