When the 7mm Mag was first introduced there was a lot of bullets that were not designed for its velocity. Sometimes the bullet would go straight through without much damage and other times it would over expand and do a lot of damage that didn't reach the vitals. If velocity alone caused damage the 7mm mag would have ben the most successful round out there. It wasn't.
Speed is only a small part of the killing potential of any round. I'll take a big bullet at moderate speeds over any bullet at super high velocity. That is how the buffalo, elephant and rhino were reduced in population.
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