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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Temp/Humidity effects on projectile flight
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<blockquote data-quote="peterb" data-source="post: 362466" data-attributes="member: 12078"><p>Hi all, two questions that I have been chewing on for a while and have decided to throw it up for the experts.(Or those with a greater expertise than mine!)</p><p>1: In the Spring of 2009 with those warm sunny days (20 - 25 c) and green grass, I zeroed a new Nightforce scope on my 308. Recently, I began to get the feeling it was shooting low, and when I checked it, found point of impact 1/2"low at 100yds. Bullet is Remington 165 grain Boat tail Accutip factory.</p><p>The weather we have been experiencing in the South West of West Oz has been 30 c plus, accompanied with around 30 % humidity.</p><p>Would this have such a great effect on the point of impact ?</p><p>2: Angle Cosine Indicator - does using one of these require more mathmatics than the Angle Degree Indicator? Ie more difficult to use. I am not carrying ballistic software, but just a card that has what I deem relevant info.</p><p> </p><p>And, be patient, you can teach an old dog new tricks ! <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite8" alt=":D" title="Big Grin :D" loading="lazy" data-shortname=":D" /></p><p> </p><p>Cheers,</p><p>Peter</p></blockquote><p></p>
[QUOTE="peterb, post: 362466, member: 12078"] Hi all, two questions that I have been chewing on for a while and have decided to throw it up for the experts.(Or those with a greater expertise than mine!) 1: In the Spring of 2009 with those warm sunny days (20 - 25 c) and green grass, I zeroed a new Nightforce scope on my 308. Recently, I began to get the feeling it was shooting low, and when I checked it, found point of impact 1/2"low at 100yds. Bullet is Remington 165 grain Boat tail Accutip factory. The weather we have been experiencing in the South West of West Oz has been 30 c plus, accompanied with around 30 % humidity. Would this have such a great effect on the point of impact ? 2: Angle Cosine Indicator - does using one of these require more mathmatics than the Angle Degree Indicator? Ie more difficult to use. I am not carrying ballistic software, but just a card that has what I deem relevant info. And, be patient, you can teach an old dog new tricks ! :D Cheers, Peter [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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Temp/Humidity effects on projectile flight
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