Hmmm. I've loaded Varget, RL#15 and IMR4064 in my .308's. All were accurate, with 4064 being the most accurate. MV was all very close, with RL#15 having a slight edge in MV. All very good powder's in .308. Never shot in extreme heat or cold, so really can not say much about temp sensitivity, other than the military uses[or used to] RL#15 in their M118 sniper rounds because of very good accuracy and insensitivity to extreme temp changes.
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