My guess is the .17/50BMG wildcat.
Seriously, though, I think something in the 7mm Mag category will beat anything in the .30 or .338 category. If it starts at the same speed, the 7mm will have a higher average speed because of its lower ballistic coefficient. And I think you can load a 7mm as fast as you can load a .30 or a .338
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I am Pro-Rights (on gun issues).
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