A 150-gr .30-'06 bullet will return to earth at 320 feet per second.
A 718-gr .50-caliber bullet will return to earth at about 500 feet per second, with energy of about 400 foot pounds.
A 1000-pound 12-inch artillery shell will return with a speed of about 1300-1400 feet per second and over 28,000,000 ft. lbs. of energy.
- from "Hatcher's Notebook", p514