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Rifles, Reloading, Optics, Equipment
Reloading
Temperature Sensitivity of Alliant Reloder 26
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<blockquote data-quote="Engineering101" data-source="post: 1321389" data-attributes="member: 63138"><p>Here is my range report from yesterday afternoon when it was 81 degrees at the range. I was shooting a 26" custom barreled 260 Rem loaded with 45.8 gr RL-26 and 143 gr ELD-Xs from 200 yards with a Lab Radar chrono. A load of 46.0 gr shot 0.359" (3 shots) at exactly 2,800 fps when it was 56 degrees the other day. I reduced the load by 0.2 gr to the 45.8 gr I mentioned to get a little margin because it went bonkers at 46.5 grains where average velocity was 2,834 fps. That is what I was testing to see if it would go bonkers again with 0.7 gr less powder but with a 25 degree temp increase. And yes it went bonkers again producing an average velocity that was almost the same as before (2,837 fps) when using more powder in cooler weather.</p><p> </p><p>To summarize:</p><p> </p><p>56 degrees, 46.0 gr = 2,800 fps, 0.359" group</p><p>56 degrees, 46.5 gr = 2,834 fps, 1.984" group</p><p>81 degrees, 45.8 gr = 2,837 fps, 1.328" group</p><p> </p><p>At velocities between 2,710 fps and 2,800 fps this rifle shoots 0.35 MOA or better but as I mentioned it falls of a cliff between 2,800 fps and 2,835 fps.</p><p> </p><p>Bottom line: I've got to take at least another 0.5 gr of powder out of the case if I want to use this load when it is 81 degrees though it is probably just fine as is at hunting temps. So yes, RL-26 has enough temp sensitivity that you have to so something about it if you want to operate both cold and hot.</p></blockquote><p></p>
[QUOTE="Engineering101, post: 1321389, member: 63138"] Here is my range report from yesterday afternoon when it was 81 degrees at the range. I was shooting a 26" custom barreled 260 Rem loaded with 45.8 gr RL-26 and 143 gr ELD-Xs from 200 yards with a Lab Radar chrono. A load of 46.0 gr shot 0.359" (3 shots) at exactly 2,800 fps when it was 56 degrees the other day. I reduced the load by 0.2 gr to the 45.8 gr I mentioned to get a little margin because it went bonkers at 46.5 grains where average velocity was 2,834 fps. That is what I was testing to see if it would go bonkers again with 0.7 gr less powder but with a 25 degree temp increase. And yes it went bonkers again producing an average velocity that was almost the same as before (2,837 fps) when using more powder in cooler weather. To summarize: 56 degrees, 46.0 gr = 2,800 fps, 0.359" group 56 degrees, 46.5 gr = 2,834 fps, 1.984" group 81 degrees, 45.8 gr = 2,837 fps, 1.328" group At velocities between 2,710 fps and 2,800 fps this rifle shoots 0.35 MOA or better but as I mentioned it falls of a cliff between 2,800 fps and 2,835 fps. Bottom line: I've got to take at least another 0.5 gr of powder out of the case if I want to use this load when it is 81 degrees though it is probably just fine as is at hunting temps. So yes, RL-26 has enough temp sensitivity that you have to so something about it if you want to operate both cold and hot. [/QUOTE]
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Temperature Sensitivity of Alliant Reloder 26
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