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Hunting
Long Range Hunting & Shooting
Velocity increase on 6 month old ammo
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<blockquote data-quote="kiwikid" data-source="post: 1643452" data-attributes="member: 56094"><p>Norma has shown that this can be caused by the ammo being stored at a lower RH which would reduce the moisture content of the powder in the loaded ammo. They loaded 30-06 ammo with Norma 203B powder and stored half at 20% RH and half at 86% RH and then tested the velocity at various intervals over 663 days. After 200 days the ammo stored at 20% RH had increased in speed by 18 m/s (59 fps), after 360 days it had increased by 28 m/s (92 fps). The ammo stored at 86% RH lost velocity.</p><p>The Oregonian you mentioned that the ammo is stored inside with heat and AC which may have altered the moisture content of the powder in loaded ammo.</p></blockquote><p></p>
[QUOTE="kiwikid, post: 1643452, member: 56094"] Norma has shown that this can be caused by the ammo being stored at a lower RH which would reduce the moisture content of the powder in the loaded ammo. They loaded 30-06 ammo with Norma 203B powder and stored half at 20% RH and half at 86% RH and then tested the velocity at various intervals over 663 days. After 200 days the ammo stored at 20% RH had increased in speed by 18 m/s (59 fps), after 360 days it had increased by 28 m/s (92 fps). The ammo stored at 86% RH lost velocity. The Oregonian you mentioned that the ammo is stored inside with heat and AC which may have altered the moisture content of the powder in loaded ammo. [/QUOTE]
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Velocity increase on 6 month old ammo
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