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Rifles, Reloading, Optics, Equipment
Reloading
Similar burn rate
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<blockquote data-quote="MontanaRifleman" data-source="post: 842470" data-attributes="member: 11717"><p>I am not saying the chart is perfect and can give me an accurate way of predicting min and max loads. In fact, this chart lists H4350 as a slightly slower powder than RL17 and my experience in my 300 WSM showed the opposite. RL17 gave me the same pressure signs that 1 gr less of H4350 did with same bullet, primer, etc.</p><p></p><p>However, knowing that RL17 was "similar" to H4350 gave me something to work with. At the time there was zero published data for a 180 gr bullet. Alliant had 165 gr bullet data which also gives something to work from. So i started about 10% lower than the listed max H4350 data showed and I ended up exceeding that by about 2 gr.</p><p></p><p>I am not saying that you can map and swap powders based on a burn chart. I am saying you can use them as a guide to determine a reasonably safe starting point.</p><p></p><p>Let's consider RL33. There is not a shred of data out there as far as I know, yet Alliant has been selling it for over a year and it is not to be found laying around on any shelf. Folks are buying it by the truck load and using it. </p><p></p><p>Based on info I've read in this forum as well as some other searches I did and comparing to similar powders in the same cartridges, I came up with some reduced break-in loads for my 300 RUM, 6.5 WSM and 6-284. My velocities were right in line with what might have been expected for those loads.</p><p></p><p>You gave an example of powders with available data. What would you do if you wanted to experiment with RL33?</p></blockquote><p></p>
[QUOTE="MontanaRifleman, post: 842470, member: 11717"] I am not saying the chart is perfect and can give me an accurate way of predicting min and max loads. In fact, this chart lists H4350 as a slightly slower powder than RL17 and my experience in my 300 WSM showed the opposite. RL17 gave me the same pressure signs that 1 gr less of H4350 did with same bullet, primer, etc. However, knowing that RL17 was "similar" to H4350 gave me something to work with. At the time there was zero published data for a 180 gr bullet. Alliant had 165 gr bullet data which also gives something to work from. So i started about 10% lower than the listed max H4350 data showed and I ended up exceeding that by about 2 gr. I am not saying that you can map and swap powders based on a burn chart. I am saying you can use them as a guide to determine a reasonably safe starting point. Let's consider RL33. There is not a shred of data out there as far as I know, yet Alliant has been selling it for over a year and it is not to be found laying around on any shelf. Folks are buying it by the truck load and using it. Based on info I've read in this forum as well as some other searches I did and comparing to similar powders in the same cartridges, I came up with some reduced break-in loads for my 300 RUM, 6.5 WSM and 6-284. My velocities were right in line with what might have been expected for those loads. You gave an example of powders with available data. What would you do if you wanted to experiment with RL33? [/QUOTE]
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Similar burn rate
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