For your 308 there are many that will work very well. Reloder 15 and Varget have to be at the top of the list for me. IMR 4064 works well as does H 4895. Nothing wrong with 3031. You can pour most anything into a 308 case and get good accuracy. You just get the same accuracy with a little more speed with some powder.
H-4350 is my go to 30-06 powder but I'll use IMR4350 if I cannot find it.
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