Bigcountry,

I've noticed more velocity/pressure variation when using Alliant powders than with any other powders I've tried. If I will be using Alliant such as RL19 and I find a max load in the winter months I'll usually have to back down 1.0-1.5 grains if I want to use it in the summer. I've just about went exclusively to the Hodgdon extreme powders for this very reason. I can't get away from RL19 though. In my custom 280 Rem. I get nearly 3200 fps with a Combined Technology 140 gr. BST. Accuracy is in the .300 range when I have a good day and on a bad day it's .625.