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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Muzzle Velocity at Different Altitudes
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<blockquote data-quote="One_Duck_Limit" data-source="post: 280844" data-attributes="member: 13320"><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I've been reading all I can find about the affects of altitude and pressure on ballistics. I've got a hypothetical question.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I live at 4550 ft above sea level. It's 60 degrees and sunny at my local range, my average chronograph reading is 3050 fps.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I jump in my truck and head to my favorite spot to practice a few long range shots. I'm now 4000 ft higher at 8550 ft above sea level. The temp is still 60 degrees and sunny.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Will my average speed still be 3050 fps? Does the lower barometric pressure have such an affect that my average speed will increase?</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">I understand the bullet will drop less because of the pressure decrease.</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Given the same temperature, the muzzle velocity at sea level would be the same as 10,000 ft… right?</span></span></p><p> </p><p><span style="font-family: 'Times New Roman'"><span style="font-size: 12px">Are changes in muzzle velocity caused mostly by the powders sensitivity to temperature changes?</span></span></p></blockquote><p></p>
[QUOTE="One_Duck_Limit, post: 280844, member: 13320"] [FONT=Times New Roman][SIZE=3]I’ve been reading all I can find about the affects of altitude and pressure on ballistics. I’ve got a hypothetical question.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I live at 4550 ft above sea level. It’s 60 degrees and sunny at my local range, my average chronograph reading is 3050 fps.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I jump in my truck and head to my favorite spot to practice a few long range shots. I’m now 4000 ft higher at 8550 ft above sea level. The temp is still 60 degrees and sunny.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Will my average speed still be 3050 fps? Does the lower barometric pressure have such an affect that my average speed will increase?[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]I understand the bullet will drop less because of the pressure decrease.[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Given the same temperature, the muzzle velocity at sea level would be the same as 10,000 ft… right?[/SIZE][/FONT] [FONT=Times New Roman][SIZE=3] [/SIZE][/FONT] [FONT=Times New Roman][SIZE=3]Are changes in muzzle velocity caused mostly by the powders sensitivity to temperature changes?[/SIZE][/FONT] [/QUOTE]
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Muzzle Velocity at Different Altitudes
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