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Rifles, Reloading, Optics, Equipment
Reloading
Excessive head space
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<blockquote data-quote="J E Custom" data-source="post: 861644" data-attributes="member: 2736"><p>Even though the powder is the same Number it is not unusual for it to have slightly different burn</p><p>rates. So you can end up with different powders mixed together. </p><p></p><p>The age of the powder can also make a difference. The older it gets it changes burn rates naturally.</p><p></p><p>Sometimes as powder gets older the groups can change because of this. I have had to add a 10th</p><p>of a grain or two to a known load the get the performance back as the powder got older.</p><p></p><p>Normally, if you are shooting max loads and run out of powder and have to buy a new can, you should </p><p>lower the powder charge on a few and test them to make sure that you are not going to </p><p>load over Max loads. I have also seen new powder lose velocity because the burn rate was </p><p>slightly slower.</p><p></p><p>Sometimes the powders are very close but often they are not. So it is not recommended that you </p><p>mix powders with different lot numbers.</p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 861644, member: 2736"] Even though the powder is the same Number it is not unusual for it to have slightly different burn rates. So you can end up with different powders mixed together. The age of the powder can also make a difference. The older it gets it changes burn rates naturally. Sometimes as powder gets older the groups can change because of this. I have had to add a 10th of a grain or two to a known load the get the performance back as the powder got older. Normally, if you are shooting max loads and run out of powder and have to buy a new can, you should lower the powder charge on a few and test them to make sure that you are not going to load over Max loads. I have also seen new powder lose velocity because the burn rate was slightly slower. Sometimes the powders are very close but often they are not. So it is not recommended that you mix powders with different lot numbers. J E CUSTOM [/QUOTE]
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Excessive head space
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