Mule Deer ,thank you much for posting some more knowledge on powders that many of us don`t have ? Mule Deer i do have question : many of the new Reloading books show Reloader 25 is a good powder for a 257 Weatherby Mag. i tried this powder in that cartridge and i did get a little better results too. ? what do you think of Reloader 25 ?
I have used RL-25 in the .257 Weatherby, and it worked very well--but like other Alliant powders of that era isn't very temp-resistant. These days I'm using H1000.
IMR 7977 matches H1000s velocities but in my particular rifle (a New Ultra Light Arms) isn't quite as accurate.