Because a contemporary lightweight 7.62 (SCAR-H, M110K1, M110K2 types) can be shot as fast, and are as maneuverable as heavier 5.56.
I pretty frequently win 2-gun competitions while shooting a 7.62 with 20 round mags (recently 25s) against 5.56 competition rigs. I most definately spent a lot of cake to get that kind of performance though.
308 is just easier to get to high terminal performance, and if I can get it in a format that I can shoot fast and with precision, well, that's "the one".
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