I would start with 175-grain data, since Berger VLD's have pretty long bearing surfaces and soft cores, both of which tend to raise pressures slightly. I have had excellent luck with H4831 in the .280, especially with heavier bullets, but other powders also work quite well. Generally (bot not always) VLD's shoot best when seated very close to the lands.
Last edited by Mule Deer; 06/12/08.