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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
marginal stability
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<blockquote data-quote="lancetkenyon" data-source="post: 1912538" data-attributes="member: 68875"><p>If you are getting a 2" variation at 100m zero, you have another issue than elevation change. If you are shooting in low elevation, low temps, then go up to high elevations/higher temps, that is more likely where you are getting your velocity increases. Powder temp sensitivity, not elevation/density altitude issues. Although, I have heard of some powders gaining pressure at extreme low temps too. </p><p></p><p>Every single rifle I have, I sight in and zero @ 1100' AMSL, and hunt anywhere from 1000-8000'. My 200 yard zero never changes at any altitude differences. Actually, they don't even change zero at temp changes, from 20 to 110+ more than 1/4" @ 200. But I try and use very temp stable powders for that reason.</p><p></p><p>I did have a .25-06AI that loved RL22, but temps had to be watched carefully. RL22 swings about 2fps per 1 degree of temp changes. Zero always stayed the same, but drops at distance would vary due to velocity changes, and DA changes of course.</p></blockquote><p></p>
[QUOTE="lancetkenyon, post: 1912538, member: 68875"] If you are getting a 2" variation at 100m zero, you have another issue than elevation change. If you are shooting in low elevation, low temps, then go up to high elevations/higher temps, that is more likely where you are getting your velocity increases. Powder temp sensitivity, not elevation/density altitude issues. Although, I have heard of some powders gaining pressure at extreme low temps too. Every single rifle I have, I sight in and zero @ 1100' AMSL, and hunt anywhere from 1000-8000'. My 200 yard zero never changes at any altitude differences. Actually, they don't even change zero at temp changes, from 20 to 110+ more than 1/4" @ 200. But I try and use very temp stable powders for that reason. I did have a .25-06AI that loved RL22, but temps had to be watched carefully. RL22 swings about 2fps per 1 degree of temp changes. Zero always stayed the same, but drops at distance would vary due to velocity changes, and DA changes of course. [/QUOTE]
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marginal stability
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