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The Basics, Starting Out
Sight In Atmosphere Question
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<blockquote data-quote="6point5x284" data-source="post: 998559" data-attributes="member: 66669"><p>I have two questions relating to atmospheric conditions when sighting in pertaining to applied ballistics, and many other ballistic programs.</p><p> </p><p>1) Powder Temperature: Is this nothing more than the temperature your bullets are at the time of sighting in? If I sight in and it's 65 degrees farenheit, is that my powder temp as long as bullets have had enough time outside where they are the same temp?</p><p> </p><p>2) Zero Atmosphere: It says in the applied ballistics program and others, that I don't need to input my zero range atmosphere for a 100 yard zero. This wasn't making sense to me. Not saying it's wrong, just need help understanding it. Wouldn't you want at least your density altitude and temperature recorded somehow when you zero? What if I zero at 10,000 feet at 100 yards, but hunt the next month for coastal blacktails at 500 feet? I realize my 100 yard shot would see minimal movement, but I zeroed at 10,000 ASL feet and never had temp or density altitude entered/stored for my zero conditions, and then take a 850 yard shot on a coastal blacktail at 500 feet ASL (hypothetical...the brush is so thick 50 yards is a stretch!) won't that cause POI shift? Obviously, the density altitude and temp for the current shot are input, but with no baseline how does it know how to tell me to adjust?</p><p> </p><p>Like I said, I'm not trying to say the program is wrong, those guys are crazy smart. I just need help understanding how it doesn't effect it later on in hunting season. I usually do loadup in the summer at 100 degrees, and hunt Montana at 20 degrees. I'm just worried I'll have impact change unless I record my zero atmospherics somehow. Thanks for any help!</p><p> </p><p>-6point5x284</p></blockquote><p></p>
[QUOTE="6point5x284, post: 998559, member: 66669"] I have two questions relating to atmospheric conditions when sighting in pertaining to applied ballistics, and many other ballistic programs. 1) Powder Temperature: Is this nothing more than the temperature your bullets are at the time of sighting in? If I sight in and it's 65 degrees farenheit, is that my powder temp as long as bullets have had enough time outside where they are the same temp? 2) Zero Atmosphere: It says in the applied ballistics program and others, that I don't need to input my zero range atmosphere for a 100 yard zero. This wasn't making sense to me. Not saying it's wrong, just need help understanding it. Wouldn't you want at least your density altitude and temperature recorded somehow when you zero? What if I zero at 10,000 feet at 100 yards, but hunt the next month for coastal blacktails at 500 feet? I realize my 100 yard shot would see minimal movement, but I zeroed at 10,000 ASL feet and never had temp or density altitude entered/stored for my zero conditions, and then take a 850 yard shot on a coastal blacktail at 500 feet ASL (hypothetical...the brush is so thick 50 yards is a stretch!) won't that cause POI shift? Obviously, the density altitude and temp for the current shot are input, but with no baseline how does it know how to tell me to adjust? Like I said, I'm not trying to say the program is wrong, those guys are crazy smart. I just need help understanding how it doesn't effect it later on in hunting season. I usually do loadup in the summer at 100 degrees, and hunt Montana at 20 degrees. I'm just worried I'll have impact change unless I record my zero atmospherics somehow. Thanks for any help! -6point5x284 [/QUOTE]
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