I have a supply of the old army surplus 4831 (also know as 4350 DATA)and its the stuff that O'Connor used for those awesome velocities. Nothing today can compete with it except perhaps the new "enhanced" factory ammo....
H-4831, IMR-4831, RL-22 are all good powders and IMR-4064 is still a great powder in the .270. it is mild of recoil, muzzle blast, and vel. is right up there.
