RE: .257 Weatherby Magnum.
Brett - That is interesting about the H4831 in your .300 Wby. I have always found it incredibly consistent in my 7mm Rem Mag. Without failH4831 gives me the best velocities and the best groups no matter which bullet/weight I feed my 7mm. I think I am going to give H1000 a try with the .257 Wby. My brother-in-law has been getting pretty good accuracy results with R22 in his .257, but none of the loads have been over a chrony.