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Rifles, Reloading, Optics, Equipment
Reloading
Altitude changes with load
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<blockquote data-quote="entoptics" data-source="post: 1971215" data-attributes="member: 104268"><p>Might I suggest you play around with <a href="https://www.longrangehunting.com/threads/merc-maximum-effective-range-calculator.247929/#post-1966488" target="_blank">MERC - Maximum Effective Range Calculator</a></p><p></p><p>Obviously it's only as good as your estimation of your uncertainties, but it will definitely give you a feel for hit probabilities and what variables are most important to learn (spoiler alert...it's wind).</p><p></p><p>Regarding your original question, inside 500 yds, air density and temperature are going to have a minimal affect compared to shooter precision, mindset (buck fever), and physical variables (fitness, shooting position, etc).</p><p></p><p>Also, the affects of altitude are the same as temperature. High altitude = easier flight = higher impact. High T is the same. So if you go up in altitude from your zero, but down in temp, the effects cancel.</p><p></p><p>I applied the worst case scenario in JBM. Load zeroed at 2820 fps at 90° on a low pressure day (29.2 corrected) @ 5000 ft. Hunting scenario at 2780 fps, 10°, high pressure day (30.2" corrected) @ 4000 ft (spot the elk from the truck!).</p><p></p><p>This resulted in 3.9" lower impact at 500 yds. That is significant, but easily accommodated if you have a ballistics calculator, barometer (smart phone), and a rough temperature. Again, this is a worst case scenario.</p></blockquote><p></p>
[QUOTE="entoptics, post: 1971215, member: 104268"] Might I suggest you play around with [URL='https://www.longrangehunting.com/threads/merc-maximum-effective-range-calculator.247929/#post-1966488']MERC - Maximum Effective Range Calculator[/URL] Obviously it's only as good as your estimation of your uncertainties, but it will definitely give you a feel for hit probabilities and what variables are most important to learn (spoiler alert...it's wind). Regarding your original question, inside 500 yds, air density and temperature are going to have a minimal affect compared to shooter precision, mindset (buck fever), and physical variables (fitness, shooting position, etc). Also, the affects of altitude are the same as temperature. High altitude = easier flight = higher impact. High T is the same. So if you go up in altitude from your zero, but down in temp, the effects cancel. I applied the worst case scenario in JBM. Load zeroed at 2820 fps at 90° on a low pressure day (29.2 corrected) @ 5000 ft. Hunting scenario at 2780 fps, 10°, high pressure day (30.2" corrected) @ 4000 ft (spot the elk from the truck!). This resulted in 3.9" lower impact at 500 yds. That is significant, but easily accommodated if you have a ballistics calculator, barometer (smart phone), and a rough temperature. Again, this is a worst case scenario. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Altitude changes with load
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