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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
What causes powder temp sensitivity?
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<blockquote data-quote="LVJ76" data-source="post: 1854661" data-attributes="member: 108965"><p>I shoot silhouette competition, the ranges are 200m, 300m, 385m and 500m, and we dial and check each distance before the match starts, this happen at say 8 am and matches usually start at 9 am. Before temp stable powders came out we knew to adjust as the day got warmer, so lets say you started the match shooting at the javelina silhouettes at 300m you dial will be right on but by the time you got the rams at 500m say 4 hours later your hits can be 4" to 6" high when the temps rise to 90 or 110 degrees. So before we shoot our strings we adjust the scope on advance, dial down anywhere from 4 to 7 clicks and good to go.</p><p></p><p>We also experience this with smalbore silhouette, the 22lr ammo also has this issue.</p><p></p><p>However there is a solution for this, just like some hunters keep the ammo close to their bodies in the cold weather to keep it warm, we keep our ammo on a small cooler with ice packs, keeps it cool and there is no water so the ammo don't get wet. </p><p></p><p>Sometimes the temp stable powders aren't as accurate so got to use what groups best and in my case it's IMR-4350.</p></blockquote><p></p>
[QUOTE="LVJ76, post: 1854661, member: 108965"] I shoot silhouette competition, the ranges are 200m, 300m, 385m and 500m, and we dial and check each distance before the match starts, this happen at say 8 am and matches usually start at 9 am. Before temp stable powders came out we knew to adjust as the day got warmer, so lets say you started the match shooting at the javelina silhouettes at 300m you dial will be right on but by the time you got the rams at 500m say 4 hours later your hits can be 4" to 6" high when the temps rise to 90 or 110 degrees. So before we shoot our strings we adjust the scope on advance, dial down anywhere from 4 to 7 clicks and good to go. We also experience this with smalbore silhouette, the 22lr ammo also has this issue. However there is a solution for this, just like some hunters keep the ammo close to their bodies in the cold weather to keep it warm, we keep our ammo on a small cooler with ice packs, keeps it cool and there is no water so the ammo don't get wet. Sometimes the temp stable powders aren't as accurate so got to use what groups best and in my case it's IMR-4350. [/QUOTE]
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What causes powder temp sensitivity?
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