Thirty-five years ago, I used IMR-4320 in my .338-06 and it worked very well. Then there was either a shortage or they stopped making it for a while. I switched to IMR-4064. Charge weight was very close to the IMR-4320 load and velocity and accuracy were just as good. Even after it was available again, I never found a need to buy any more IMR-4320.
