Originally Posted by
mic2377
Long action cases are not compatible with the 308 AR platform, end of story. No LR-308 or AR-10 is chambered in these as they do not fit in the mag. Hence the use of 308, or one of its variants, from 243 win to 338 federal.
I would stick with 308 for any barrel length 20" or below. The 6.5 variants are also very versatile and flatter shooting than the 308 but really need a 22" or longer barrel.
Perhaps the best choice of all for most use is the 6.5 or 6.8 AR-15 cartridges. Much lighter and more compact than a large frame AR.
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