Much like what nyrifleman has said, the two powders I saw recommended the most for that application was IMR 7828 SSC & Reloder 25. I picked up a pound of each and easily found a good load with IMR 7828 SSC & 150g Barnes TTSX. The RL-25 and the 160g Partition is still in development, but shows promise.

Last edited by Azar; 06/30/10. Reason: fixed typo

“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