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Rifles, Reloading, Optics, Equipment
Reloading
Thoughts on mixing powder lots?
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<blockquote data-quote="J E Custom" data-source="post: 1257925" data-attributes="member: 2736"><p>The idea behind loading duplex loads was the fact that we didn't have very many powders to work with and if you needed to use a slow burning powder, it could be hard to light with any consistency.</p><p>That is not the case anymore because we have many powders to chose from and very hot primers.</p><p></p><p>When this was normal, we looked for SDs below 15 to 20 ft/sec. and if we achieved single digits,</p><p>we were elated. Now it is everyone's goal to get into single digits and quite common.</p><p></p><p>The problem has always been the uniformity of the mix, whether blended or duplex. With the duplex loads we always used the faster powder near the primer to aid in ignition and the slower powder next to the bullets. sometimes we even added a 3rd powder (A few grains of very fast priming powder and the results were no better. We would get the slow powder to burn but SDs and ESs</p><p>were no better.</p><p></p><p>The older the loads got the greater the change in SDs because of migration of the fast/fine powders into the main powder charge, changing the burn rate. we tried many cures for this and nothing really work. the same issue exist when you mix powders.(The mix is not always even and distributed evenly).</p><p></p><p>I realize that there are people that still mix powders and load duplex loads, and all I am saying is it is not necessary anymore, and can lead to other problems that are not necessary.</p><p></p><p>The manufactures have Many reasons for not blending. and with the need to do so gone I stopped</p><p>doing it (Like many back in the day I tried many things that were not recommended but found that normal loading practices produced the best, most consistent results.</p><p></p><p>Just My advice</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1257925, member: 2736"] The idea behind loading duplex loads was the fact that we didn't have very many powders to work with and if you needed to use a slow burning powder, it could be hard to light with any consistency. That is not the case anymore because we have many powders to chose from and very hot primers. When this was normal, we looked for SDs below 15 to 20 ft/sec. and if we achieved single digits, we were elated. Now it is everyone's goal to get into single digits and quite common. The problem has always been the uniformity of the mix, whether blended or duplex. With the duplex loads we always used the faster powder near the primer to aid in ignition and the slower powder next to the bullets. sometimes we even added a 3rd powder (A few grains of very fast priming powder and the results were no better. We would get the slow powder to burn but SDs and ESs were no better. The older the loads got the greater the change in SDs because of migration of the fast/fine powders into the main powder charge, changing the burn rate. we tried many cures for this and nothing really work. the same issue exist when you mix powders.(The mix is not always even and distributed evenly). I realize that there are people that still mix powders and load duplex loads, and all I am saying is it is not necessary anymore, and can lead to other problems that are not necessary. The manufactures have Many reasons for not blending. and with the need to do so gone I stopped doing it (Like many back in the day I tried many things that were not recommended but found that normal loading practices produced the best, most consistent results. Just My advice J E CUSTOM [/QUOTE]
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Thoughts on mixing powder lots?
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