Ya know couple things about choosing powder that works for me. The powder that work's best in one rifle may not in another, unless your shooting a 308! When picking a powder, I look at which one gives the highest velocity with the bullet I want. Then I don't like a compressed load but my powder need's to fill the case 80% to 90% with a max load. I don't know what most people call 90% but for me it's just below the case neck. I like mid to a bit heavy bullet's in most rifle's so data for light and very heavy bullet's in that cartridge don't interest me. A powder I find useful in about everything is IMR 4350, don't know why but it simply works for me in most cartridges. In the 270 if I tried 4831 it would be first the IMR version. As I recall it doesn't take quite as much to fill the case and as I said, don't care for compressed loads. I doubt in the 270 I'd try anything slower than a 4831 or faster than a 4350.