Bullet design may play a role, but I think its more velocity and energy. The .308 at 800 yards has been relegated to near handgun velocities while the RUM is still holding the velocity of a low energy rifle. The 168 berger is still ticking along at 2100 at 800 yds. 2100 is plenty fast enough to make the Berger make a mess of some meat.
I also shoot 168 Bergers in the .308 Win.
I don't drag the RUM out except for the bean field. A .257 Roy and a 7 WSM are my intermediate range rifles. The .308 and .243 Win usually carry the short to intermediate range load.
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