I can't offer any help as I have never seen a 308 that was more accurate with Shorter ( lighter ) Bullets than longer ( heavier ) ones unless it was a 1:14 twist barrel then the 155's were more accurate than 175's for example .
I have never used the 100-115 grain bullets except for short rangd partridge loads and would never consider a lighter bullet for hunting in the 308
Cat
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Anytime I figure I've got this long range thing figured out, I just strap into the sling and irons and remind myself that I don't! 
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