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How can Hornady squeeze so much speed out of the same bullet? The best figure their load data provides is 2650.
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Well, one way to do that is to use DIFFERENT test guns.
Does the speed data on the ammo box tell you what gun it was tested from? Barrel length?? Anything?? or just a velocity figure???
Two different barrel of identical length shooting the same ammo can give velocities as much as 100fps apart. Rare, but it happens.
Also, consider that where a powder "maxes out" can differ from tester to tester as well. Different testers use different guns, and different combinations of components.
ALSO remember that any quoted velocity is almost always an AVERAGE, and that terms like "extreme spread" and "standard deviation" are used and why they are used.
NOBODY's data is, or can be a "will produce this in every gun, every shot" thing. None of it.