jmr40,
source for this data?
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Varget and RL-15 will give you a bit more velocity and both are very temerature tolerant. I don't shoot long range, but these are my prefered 308 powders. H4895 is more temperature tolerant than IMR4895 or 4064. Other than any of those are good powders. Lots or good choices for a 308 really.
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Death from Afar,
175 SMK's are a good bet, although if you are shooting fullbore you'll probably have to use 155's.
Jimro