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Old 05-08-2004 | 11:55 AM
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driftrider
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Joined: Feb 2003
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From: Coralville, IA. USA
Default RE: How high ?

I submit that the 9000 feet max altitude Hatcher gives is much closer to what a 7.62mm NATO bullet would attain, (probably somewhat less for the 147-grain flatbased .308" NATO bullet), rather than the figures given above that show such outlandish predictions as 32,653 METERS!! It might, on the MOON! But you CANNOT IGNORE air resistance if you are shooting on a planet which has an atmosphere! Hell, even the 120mm antiaircraft gun has a vertical range of only 12 miles (63,360 FEET) with charge 8!!
The calculations are accurate if we, like all of us specified, disregard drag. I think everyone here also realizes that drag is a major factor and knew that the 32,000m altitude was little more than a curiousity than an accurate prediction of the bullets actual attained altitude. None of use here are ballisticians and therefore know the very conplex formulas and calculations necessary to predict a bullets velocity when fired vertically, perticularly since the pressure, temperature and density of the air varies significantly in the vertical plane. We also didn't have the book you sited either. Because of this these predictions were acknowledged from the beginning as little more than for curiousity and amusement, and not meant as an accurate predictor of actual events. Of course, if I were to be nitpicky I could make the claim that your informations predicted altitude of 9,000ft is not accurate or applicable to the .308", 147gr NATO ball bullet because it has a different weight, diameter, BC and muzzle velocity than either the English or German bullets your data was based on and is itself meaningless.

Judging by your liberal use of exclamation marks (!) here and in all your posts I'd guess that you are very high strung, as you seem to exclaim everything.

FYI: If the same bullet were fired on the moon where atmosphere is negligable and really can be ignored, the bullet would reach an altitude of roughly 200km in 500 seconds. The average gravitational accelleration of the moon at the equator is 1.6m/s^2, which is almost exactly 1/6 of Earth's gravity.

Mike
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