It's not a question of energy, it a question of trajectory. A 250 grain Hornady hollow point @1800 fps will drop 17.3" at 200 when zeroed at 100. Worse, it's dropping fast because it was 11" at 180 yards. So misjudge the distance by only 20 yards and you'll be 6" off.
Yes, I know you can use a rangefinder and holdover, but why not just use a 308, aim and fire?
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