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Long Range Hunting & Shooting
Re-zeroing at altitude
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<blockquote data-quote="jamiebolseth" data-source="post: 1720175" data-attributes="member: 88495"><p>As a matter of practicality... My question is really one of curiosity and an attempt to develop a full understanding of how the ballistics software works, and the impact of air density on my bullet.</p><p></p><p>I don't really believe that I'll miss/wound my mule deer at 600 yds because of a potential difference in my 100 yd zero due to air density. So in a practical sense the answer is likely "it doesn't matter, you'll still kill your deer". But things that don't make sense bug me.</p><p></p><p>The explanation that "at 100 yds it's too small to matter" makes perfect sense. But when I changed my zero distance to 1500 yds. it HAS to make a difference, but the computer didn't reflect that. So that's really a head-scratcher for me. </p><p></p><p>The question "Have you shot at both elevations to observe the difference?" is another point to think about... The answer in my case is "kind of". The land I hunt belongs to our family, so I shoot there often, and have targets setup past 1000 yds. Sure - I can go up there and hit 10" targets at 800 or 1000 yds, or shot 1" dots at 100 yds. But just the act of relocating introduces a lot of other variables... Vertical drafts in the mountains, dynamic jump from left/right winds, your shooting position changes, the temp changes, the target might be at an angle up/down, mirage conditions might be different. So if I DID see a difference I'm not sure I'd trust that it was purely attributable to air density. This is why I wanted to do this all on the computer where you can artificially hold all the other variables constant. But when I did that I couldn't make sense of what I was seeing.</p><p></p><p>Anyway - Interesting thoughts on the topic...</p><p></p><p>JamieB</p></blockquote><p></p>
[QUOTE="jamiebolseth, post: 1720175, member: 88495"] As a matter of practicality... My question is really one of curiosity and an attempt to develop a full understanding of how the ballistics software works, and the impact of air density on my bullet. I don't really believe that I'll miss/wound my mule deer at 600 yds because of a potential difference in my 100 yd zero due to air density. So in a practical sense the answer is likely "it doesn't matter, you'll still kill your deer". But things that don't make sense bug me. The explanation that "at 100 yds it's too small to matter" makes perfect sense. But when I changed my zero distance to 1500 yds. it HAS to make a difference, but the computer didn't reflect that. So that's really a head-scratcher for me. The question "Have you shot at both elevations to observe the difference?" is another point to think about... The answer in my case is "kind of". The land I hunt belongs to our family, so I shoot there often, and have targets setup past 1000 yds. Sure - I can go up there and hit 10" targets at 800 or 1000 yds, or shot 1" dots at 100 yds. But just the act of relocating introduces a lot of other variables... Vertical drafts in the mountains, dynamic jump from left/right winds, your shooting position changes, the temp changes, the target might be at an angle up/down, mirage conditions might be different. So if I DID see a difference I'm not sure I'd trust that it was purely attributable to air density. This is why I wanted to do this all on the computer where you can artificially hold all the other variables constant. But when I did that I couldn't make sense of what I was seeing. Anyway - Interesting thoughts on the topic... JamieB [/QUOTE]
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