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Long Range Hunting & Shooting
N570 Powder Shortage?
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<blockquote data-quote="J E Custom" data-source="post: 1462820" data-attributes="member: 2736"><p>My experiences with heat sensitivity in powders has been that the range of velocity changes normally don't show up at colder temperatures like they do at warmer temperatures. </p><p></p><p>If you do load development during the summer, they will be fine during cold weather but velocities will fall off and your zeros will probably change. But if you work up loads during the winter and try to use them in hot weather, they could be dangerously hot (High pressures).</p><p></p><p>I have a 7/08 that has this problem using the most accurate load.</p><p>The H 414 powder is very heat sensitive and the load produces a velocity of 3010 ft/sec during the winter (25 o to 50 o) but during the summer when temps can exceed 100 o. The velocity reaches 3155, And starts over pressuring the brass leaving ejector marks.</p><p></p><p>I try not to use heat sensitive powder, but sometimes accuracy dictates that I do, so I just don't use them during these hot months. to be safe or adjust the powder charge to compensate for the heat.</p><p></p><p>I have used lots of RE 33 and found it, like many others to be heat sensitive in most of my big magnums once the outside temp reaches 90+ degrees. Also In cold weather, Primers play a larger role than the heat sensitivity of powders.</p><p></p><p>Just my opinion</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1462820, member: 2736"] My experiences with heat sensitivity in powders has been that the range of velocity changes normally don't show up at colder temperatures like they do at warmer temperatures. If you do load development during the summer, they will be fine during cold weather but velocities will fall off and your zeros will probably change. But if you work up loads during the winter and try to use them in hot weather, they could be dangerously hot (High pressures). I have a 7/08 that has this problem using the most accurate load. The H 414 powder is very heat sensitive and the load produces a velocity of 3010 ft/sec during the winter (25 o to 50 o) but during the summer when temps can exceed 100 o. The velocity reaches 3155, And starts over pressuring the brass leaving ejector marks. I try not to use heat sensitive powder, but sometimes accuracy dictates that I do, so I just don't use them during these hot months. to be safe or adjust the powder charge to compensate for the heat. I have used lots of RE 33 and found it, like many others to be heat sensitive in most of my big magnums once the outside temp reaches 90+ degrees. Also In cold weather, Primers play a larger role than the heat sensitivity of powders. Just my opinion J E CUSTOM [/QUOTE]
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