IMR 4166 and 308 Win

The only luck I had with it for accuracy was with the lower third of it's load range pushing 175SMK's
I still have over 5lbs of it and I'm trying to find a use for it in heavy 223's or a slow twist 6BR.
 
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Same rifle, bullet, basically same primer, and case. The difference is Varget on the right and 4166 on the left.