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Rifles, Reloading, Optics, Equipment
Reloading
powder temperature sensitivity
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<blockquote data-quote="Shawn Carlock" data-source="post: 210015" data-attributes="member: 4"><p>I am in agreement with GG on 80 deg being the piviot point I too have seen this with many powders. I have been a long time Hodgen Extreme powder fan. I also agree that even the best powders are sensitive to some degree, some less than others. I have in addition noted that the combination of components effects temp sensitivity it is not just a powder issue. H1000 is slightly more sensitive to temp in a 300 RUM with CCI250, and 200 NAB's than it is with a 338 Edge with CCI 250's, and 300 SMK's. I have also noted that primer choice with effect this also, in the 338 Edge 215M primers made the combo more temp sensitive than the CCI250's did. I have seen these differences in multiple rifles. In the end it takes a little work to find the best temp sensitivity combo. I use a laser thermometer in cold conditions to do this. I shoot a controll group at ambient temp (20-40 degrees) then warm up a number of rounds to 60 degrees and 100 degrees to shoot comparison groups. Ultimately the best I have come up with is a consistant 18-20 fps spread from 24 degrees to 100 degrees. I was only able to do this with one caliber and combination. The rest varied from 30 to almost 250 fps. </p><p>You can do like Jeff does and make a temp / velocity chart and enter the velocity for the temp your in but that to me is just one more thing to have to screw with. If you are using a temp sensitive combo you can change velocity by having a round in a warm rifle barrel for a minute despite the ambient temp being cooler. I have seen this "barrel warming" of the round change the velocity with as little time as 30 seconds in the barrel on sensitive loads. Good question DRPB and good responses.</p></blockquote><p></p>
[QUOTE="Shawn Carlock, post: 210015, member: 4"] I am in agreement with GG on 80 deg being the piviot point I too have seen this with many powders. I have been a long time Hodgen Extreme powder fan. I also agree that even the best powders are sensitive to some degree, some less than others. I have in addition noted that the combination of components effects temp sensitivity it is not just a powder issue. H1000 is slightly more sensitive to temp in a 300 RUM with CCI250, and 200 NAB's than it is with a 338 Edge with CCI 250's, and 300 SMK's. I have also noted that primer choice with effect this also, in the 338 Edge 215M primers made the combo more temp sensitive than the CCI250's did. I have seen these differences in multiple rifles. In the end it takes a little work to find the best temp sensitivity combo. I use a laser thermometer in cold conditions to do this. I shoot a controll group at ambient temp (20-40 degrees) then warm up a number of rounds to 60 degrees and 100 degrees to shoot comparison groups. Ultimately the best I have come up with is a consistant 18-20 fps spread from 24 degrees to 100 degrees. I was only able to do this with one caliber and combination. The rest varied from 30 to almost 250 fps. You can do like Jeff does and make a temp / velocity chart and enter the velocity for the temp your in but that to me is just one more thing to have to screw with. If you are using a temp sensitive combo you can change velocity by having a round in a warm rifle barrel for a minute despite the ambient temp being cooler. I have seen this "barrel warming" of the round change the velocity with as little time as 30 seconds in the barrel on sensitive loads. Good question DRPB and good responses. [/QUOTE]
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