I have both in a tikka platform, both 20" barrel shooting 162gr ELD-M.
708 = 2700fps with SF powder
284win = 2830fps with RL26
Both tack drivers but practically no difference at practical hunting ranges. That said I love the 284win, pretty much perfect all rounder in a lightweight rifle that you can spot your shots with and have enough wind bucking with VLD projectiles to be very effective at respectable ranges. It's my 0-600yrd rifle.
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