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Rifles, Reloading, Optics, Equipment
Reloading
Powder Stability.
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<blockquote data-quote="tim_w" data-source="post: 1353190" data-attributes="member: 11132"><p>Honestly the entire idea of ratings powder on temp/fps is flawed. It certainly can help in a comparison but still. Powder voluem bullet weight even barrel length can have an effect.</p><p></p><p>Consider say the difference in degree to fps gain of say a 6mm but on in 6mm/284 vs 6mmbr even if they were both using the same bullet. One has a ton more powder and the increase is per degree is going to be way higher. The effect is a ratio not a static line. Now throw in different bullet weights. OR same weight but different bearing surface lengths.</p><p></p><p>Its one of the reasons you we see such wildly varying numbers. At best if we are sure to collect data and ensure its from many different cartridges and bullet weights we can possibly get a rough average but thats best case scenario.</p><p></p><p>What is really needed is some standard that can then be used as a reference much like we have and use burn rates with powders presently.</p><p></p><p>Point being with overbore cartridges vs non overbore you are going to see higher fps/temp degree in the prior vs the later for a given caliber (same bullet). As its a ratio of pressure you will likely also see higher vel/degree with a longer vs short barrel in some cases.</p></blockquote><p></p>
[QUOTE="tim_w, post: 1353190, member: 11132"] Honestly the entire idea of ratings powder on temp/fps is flawed. It certainly can help in a comparison but still. Powder voluem bullet weight even barrel length can have an effect. Consider say the difference in degree to fps gain of say a 6mm but on in 6mm/284 vs 6mmbr even if they were both using the same bullet. One has a ton more powder and the increase is per degree is going to be way higher. The effect is a ratio not a static line. Now throw in different bullet weights. OR same weight but different bearing surface lengths. Its one of the reasons you we see such wildly varying numbers. At best if we are sure to collect data and ensure its from many different cartridges and bullet weights we can possibly get a rough average but thats best case scenario. What is really needed is some standard that can then be used as a reference much like we have and use burn rates with powders presently. Point being with overbore cartridges vs non overbore you are going to see higher fps/temp degree in the prior vs the later for a given caliber (same bullet). As its a ratio of pressure you will likely also see higher vel/degree with a longer vs short barrel in some cases. [/QUOTE]
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