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Rifles, Reloading, Optics, Equipment
Reloading
Temperature Sensitivity of Alliant Reloder 26
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<blockquote data-quote="dminn1" data-source="post: 1322531" data-attributes="member: 101811"><p>I ran an informal test on Reloader 26 Temp sensitivity after noticing a significant velocity increase on a 85 degree day earlier this month. This test was by no means scientific but I think it shows a useful result. I am shooting .243 Win with Berger 105g Hybrids, Win brass, Tula LR primers. For the test I took 6 rounds loaded to the same charge and put 3 in ice in the cooler for 15 minutes and 3 rounds in the direct sunlight for 15 minutes. Outside temp was 87, humidity 70%. The rounds were removed from the cooler or the sun one at a time and fired in the rifle about as soon as the bolt was closed. Velocity was recorded on a LabRadar.</p><p></p><p>Ice cold rounds: 3205, 3218, 3203 avg 3208</p><p></p><p>Sun heated rounds: 3298, 3269, 3275 avg 3280</p><p></p><p>Ambient temp rounds averaged 3250 fps. When this load was developed it was 70 with low humidity and the load averaged 3200 fps.</p><p></p><p>That is a 72 degree spread through what is likely to be about as severe of a temp spread as you would ever encounter in the field. My chrono data seems to indicate that this powder is most sensitive when the temps move above 80 degree as that is when I have noticed the only significant velocity spreads. I will have to wait for fall and cooler weather to test this as I developed this load in 65 to 70 degree weather.</p></blockquote><p></p>
[QUOTE="dminn1, post: 1322531, member: 101811"] I ran an informal test on Reloader 26 Temp sensitivity after noticing a significant velocity increase on a 85 degree day earlier this month. This test was by no means scientific but I think it shows a useful result. I am shooting .243 Win with Berger 105g Hybrids, Win brass, Tula LR primers. For the test I took 6 rounds loaded to the same charge and put 3 in ice in the cooler for 15 minutes and 3 rounds in the direct sunlight for 15 minutes. Outside temp was 87, humidity 70%. The rounds were removed from the cooler or the sun one at a time and fired in the rifle about as soon as the bolt was closed. Velocity was recorded on a LabRadar. Ice cold rounds: 3205, 3218, 3203 avg 3208 Sun heated rounds: 3298, 3269, 3275 avg 3280 Ambient temp rounds averaged 3250 fps. When this load was developed it was 70 with low humidity and the load averaged 3200 fps. That is a 72 degree spread through what is likely to be about as severe of a temp spread as you would ever encounter in the field. My chrono data seems to indicate that this powder is most sensitive when the temps move above 80 degree as that is when I have noticed the only significant velocity spreads. I will have to wait for fall and cooler weather to test this as I developed this load in 65 to 70 degree weather. [/QUOTE]
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Reloading
Temperature Sensitivity of Alliant Reloder 26
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