I don't have much to contribute, seeing as our resident experts have it covered. Still, it might interest the OP to know that there are AR-15 variants available in 308Win. You don't have to abandon your dreams of 308 power out of an AR, and no magical gunpowder required!
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"... I cannot but conclude the bulk of your [politicians] to be the most pernicious race of little odious vermin that nature ever suffered to crawl upon the surface of the earth." ~ Jonathon Swift
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