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Long Range Hunting & Shooting
effects of altitude on loads
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<blockquote data-quote="djtjr" data-source="post: 433838" data-attributes="member: 13195"><p>hey guys i am wondering if anyone has any experience with this but i am based in the east at sea level when i have gone out west to altitude (6-8000 feet) i have noticed that a) my groups open up a bit and b) balistic trajectories are different even when compensating for them with a balistic calculator in my case bullet flight. how do you guys eliminate most of the variables without just developing a load at altitude as that is not all that easy or convenient? does the lower presure at altitude also change the velocity of the bullet therefore changing the barrel harmonice and trajectories beyond just the effects during flight which a program should calculate for? if so do you bring a chrono when going to these high places? whats the best way to compute altitude altitude (ie changing altitude or actual presure or both in your balistic program) if you do presure and altitude could it be a double count that throws you off further? what do you do in your programs to account for the base case sight in at sealevel vs the new condition at altitude? i think you may get the idea of where i am going wth this but want to learn moea bout these variables for upcoming hunts. </p><p>thanks and any and all thoughts or perferably facts<img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /> are appreciated.</p><p>best,</p><p>Don</p></blockquote><p></p>
[QUOTE="djtjr, post: 433838, member: 13195"] hey guys i am wondering if anyone has any experience with this but i am based in the east at sea level when i have gone out west to altitude (6-8000 feet) i have noticed that a) my groups open up a bit and b) balistic trajectories are different even when compensating for them with a balistic calculator in my case bullet flight. how do you guys eliminate most of the variables without just developing a load at altitude as that is not all that easy or convenient? does the lower presure at altitude also change the velocity of the bullet therefore changing the barrel harmonice and trajectories beyond just the effects during flight which a program should calculate for? if so do you bring a chrono when going to these high places? whats the best way to compute altitude altitude (ie changing altitude or actual presure or both in your balistic program) if you do presure and altitude could it be a double count that throws you off further? what do you do in your programs to account for the base case sight in at sealevel vs the new condition at altitude? i think you may get the idea of where i am going wth this but want to learn moea bout these variables for upcoming hunts. thanks and any and all thoughts or perferably facts:) are appreciated. best, Don [/QUOTE]
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effects of altitude on loads
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