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Old October 18, 2014, 12:00 PM   #10
JohnKSa
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Join Date: February 12, 2001
Location: DFW Area
Posts: 21,069
All objects drop at the same rate in a vacuum.

In air, the objects drop at a rate determined by the interaction of gravity and the air resistance. Very dense objects (rocks, bullets) fall relatively fast, objects that aren't dense (feathers, Ping-Pong balls) fall more slowly.

If you have two bullets of the same size/shape, the one that is more dense will fall a tiny bit faster. HOWEVER, the difference isn't really significant since bullets are all pretty dense, they're all shaped about the same (in terms of the profile they present to the ground) and they usually aren't falling a long distance.

In practice, the only significant contributor to bullet drop is time of flight. If you have two identical bullets, the one that takes the longest to get to the target will drop the most. That's because gravity has more time to act on it. sirgilligan has it right.
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