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The Range
Handgun Discussion
Terminal Ballistics from the Morgue
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<blockquote data-quote="NikatKimber" data-source="post: 1616021" data-attributes="member: 423"><p>Ran more calculations.</p><p></p><p>......................9mm.......45 ACP </p><p>Diameter (in):..0.355........0.45 </p><p>Weight (grns):...124..........230 </p><p>MV (fps):.........1110..........850 </p><p>Frt Area (in2):..0.099.......0.159....&#960;*(Dia/2)^2</p><p>Mass (Slugs):..0.00055...0.00102...Unit Conversion, Weight in grains / 7000 (grns/lb) / 32.1 (lbs/slug)</p><p>ME (Ft Lbs):.....340.0.......369.8.....1/2 * Mass * Vel^2</p><p>Inertia ():.........0.61.........0.87....Mass * Vel</p><p>Drag Factor:...147322......125978...Frontal Area * Vel^2</p><p>......................1.06......................9mm Will slow this much faster *initially* than .45, given similar drag coefficients. This factor changes dynamically with speed, so as it slows down, the difference in the rate of acceleration changes (in this case, the difference decreases)</p><p></p><p>At the muzzle, a .45 has 8% more Kinetic energy, and 30% higher inertia. At 100yds, the .45 has 19% higher KE, and 34% higher inertia.</p><p></p><p>The numbers don't lie, the .45 ACP is a more powerful round. But as has been asked, is it enough to matter.</p><p></p><p>Don't get me wrong, I carry a 9mm. I have decided that for me, I prefer having 16 rounds of 9mm at a slight cost to me in power, to save on recoil and practice cost.</p></blockquote><p></p>
[QUOTE="NikatKimber, post: 1616021, member: 423"] Ran more calculations. ......................9mm.......45 ACP Diameter (in):..0.355........0.45 Weight (grns):...124..........230 MV (fps):.........1110..........850 Frt Area (in2):..0.099.......0.159....π*(Dia/2)^2 Mass (Slugs):..0.00055...0.00102...Unit Conversion, Weight in grains / 7000 (grns/lb) / 32.1 (lbs/slug) ME (Ft Lbs):.....340.0.......369.8.....1/2 * Mass * Vel^2 Inertia ():.........0.61.........0.87....Mass * Vel Drag Factor:...147322......125978...Frontal Area * Vel^2 ......................1.06......................9mm Will slow this much faster *initially* than .45, given similar drag coefficients. This factor changes dynamically with speed, so as it slows down, the difference in the rate of acceleration changes (in this case, the difference decreases) At the muzzle, a .45 has 8% more Kinetic energy, and 30% higher inertia. At 100yds, the .45 has 19% higher KE, and 34% higher inertia. The numbers don't lie, the .45 ACP is a more powerful round. But as has been asked, is it enough to matter. Don't get me wrong, I carry a 9mm. I have decided that for me, I prefer having 16 rounds of 9mm at a slight cost to me in power, to save on recoil and practice cost. [/QUOTE]
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