Posted by Sagebrusher on February 13, 2009 at 11:49:58 from (69.19.14.28):
In Reply to: OT-Balistics question posted by Bill Porter on February 12, 2009 at 20:13:07:
Bill, For this and other in-depth answers to your question I recommend you buy or borrow a copy of "HATCHER"S NOTEBOOK" by Julian S Hatcher, Maj Gen U.S.A.(ret.)(now deceased)) ISBNO-8117-0614-1 See Chapter XX "Bullets from the Sky" Gen Hatcher calculated through mathematical means verified by live fire that the 150 gr .30 cal M2 bullet fired at a 90 dgree angle with a mv of 2,700 fps would acheive a maximum height of around 9,000 feet. The bullets took approximately 18 seconds to reach max altitude and an average 31 seconds to return for roughly 50 seconds to return after firing. The return times and velocity were dependant on whether the bullets returned base down (the fastest return) or tumbled end over end (the slowest.) Gen Hatcher felt that during the last few thousand feet of fall that the bullet's return was at a constant 300 fps with an attnedant 30 foot pounds of energy. Bullets with higher ballistic coefficients travel higher/farther and thus take longer to return. Most of the casualties you hear and read about are produced by ignorant buffoons haphazardly firing weapons at less than perpendicular angles resulting in arcing trajectory curves where the bullet remains point on with, usually, more velocity than a bullet returning to earth in freefall mode.
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