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Rifles, Reloading, Optics, Equipment
Reloading
powder temperature sensitivity
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<blockquote data-quote="goodgrouper" data-source="post: 209949" data-attributes="member: 2852"><p>Absolutely! There have been many tests on this subject. Many have been published and some data is contradictive but I'll give you my own personal results.</p><p></p><p>As far as brands go, here's my list from most temperamental to least:</p><p></p><p>1. Ramshot (because they are all rifle ball powders)</p><p>2. Winchester (because they are all rifle ball powders)</p><p>3. Accurate (because they are mostly rifle ball powders)</p><p>4. Alliant</p><p>5. IMR</p><p>6. VV</p><p>7. Hodgdon</p><p></p><p></p><p>As for individual powders, my list is this: (I'm not going to name each powder here, just a few of the best and worst and a few of the ones in the middle)</p><p></p><p>most temperamental to least:</p><p></p><p>H380</p><p>H414</p><p>WW748</p><p>AA2460</p><p>WW760</p><p>H335</p><p>RL25</p><p>RL22</p><p>IMR4198</p><p>AA4350</p><p>VV550</p><p>H4895</p><p>IMR4350</p><p>IMR4831</p><p>IMR7828</p><p>N165</p><p>H1000</p><p>H322</p><p>H4831ssc</p><p>N170</p><p>N133</p><p>Benchmark</p><p>Varget</p><p></p><p></p><p>Even though some of the powders listed towards the bottom of the list are great for weather insensitivity, they still exhibit a need to tweek with the charge slightly in temperature changes to maintain a certain pressure. Despite some claims by some manufacturers that their powders will shoot the same from 20 below to 120 above, no powder is perfect. Temperature changes all combustables combustion. Period. It is unavoidable no matter what "coating" you use on the powder. And all powders show markedly different characteristics once the temp gets to and above 80 degrees. Loads worked up above 80 will still work accurately as long as the temp stays above 80 degrees. But loads worked up below 80 degrees F do better shot up to around 75 degrees. Or in other words, loads worked up in cool weather hold their node for a longer temp range than loads worked up at or above 80 degrees F.</p><p></p><p>I'm not sure why 80 degrees is the unlucky number, but I have seen this be the fulcrum of load development time and time again with every brand and make of powder--especially ball powders.</p></blockquote><p></p>
[QUOTE="goodgrouper, post: 209949, member: 2852"] Absolutely! There have been many tests on this subject. Many have been published and some data is contradictive but I'll give you my own personal results. As far as brands go, here's my list from most temperamental to least: 1. Ramshot (because they are all rifle ball powders) 2. Winchester (because they are all rifle ball powders) 3. Accurate (because they are mostly rifle ball powders) 4. Alliant 5. IMR 6. VV 7. Hodgdon As for individual powders, my list is this: (I'm not going to name each powder here, just a few of the best and worst and a few of the ones in the middle) most temperamental to least: H380 H414 WW748 AA2460 WW760 H335 RL25 RL22 IMR4198 AA4350 VV550 H4895 IMR4350 IMR4831 IMR7828 N165 H1000 H322 H4831ssc N170 N133 Benchmark Varget Even though some of the powders listed towards the bottom of the list are great for weather insensitivity, they still exhibit a need to tweek with the charge slightly in temperature changes to maintain a certain pressure. Despite some claims by some manufacturers that their powders will shoot the same from 20 below to 120 above, no powder is perfect. Temperature changes all combustables combustion. Period. It is unavoidable no matter what "coating" you use on the powder. And all powders show markedly different characteristics once the temp gets to and above 80 degrees. Loads worked up above 80 will still work accurately as long as the temp stays above 80 degrees. But loads worked up below 80 degrees F do better shot up to around 75 degrees. Or in other words, loads worked up in cool weather hold their node for a longer temp range than loads worked up at or above 80 degrees F. I'm not sure why 80 degrees is the unlucky number, but I have seen this be the fulcrum of load development time and time again with every brand and make of powder--especially ball powders. [/QUOTE]
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