.50 BMG (13k-15k ft/lbs) will bring more energy than a .700 Nitro Ex (9-15k ft/lbs), but custom loads can get close to matching the energy. Think +p on steroids and an overbuilt rifle.
A 50 overall length is 1 1/2" longer, though.
The .700 has about 40% more mass in the bullet itself, but travels .33% slower. When you double velocity you quadruple energy. That's where the .50 shines.
Cool stuff.
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