IMR 4064 used to be my most favorite. I did exactly the opposite of what you did.
I switched from IMR 4064 to AA 2520. After much playing with AA 2520, it NOW is my most favorite powder in the 308.
It meters like a dream and accuracy is right up there with 4064.
The extruded powders have and most likely will always be a pain to meter smoothly through a standard powder measure.
Work with your AA 2520 and you too will find the sweet load that gives you exceptional accuracy.
TS
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