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Rifles, Reloading, Optics, Equipment
Reloading
Too much pressure?
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<blockquote data-quote="Freebore" data-source="post: 290353" data-attributes="member: 873"><p>You definitely need to get a chrony! I use this along with bolt lift. If the bolt lift just gets a bit tight I'll back down and/or change powders to get a/my desired safe pressure/velocity. You need a chrony to measure SD and ES and the velocity you are trying to attain. Although groups do tell the picture. A primer change can make all the difference in the world when stretching out distances due to SD/ES.</p><p></p><p> Measuring cartridge base is a good indicator too, if you have the micrometer tools to do that.</p><p> </p><p> Some cartridges do show pressure 'indicators' at bottom loading, this all relevant to a particular loading with all components coming into play.</p><p></p><p>Those 'ridges' on the primers could be 'primer flow' due to the firing pin diameter vs. bolt face firing pin hole. Maybe needs to be bushed.</p></blockquote><p></p>
[QUOTE="Freebore, post: 290353, member: 873"] You definitely need to get a chrony! I use this along with bolt lift. If the bolt lift just gets a bit tight I'll back down and/or change powders to get a/my desired safe pressure/velocity. You need a chrony to measure SD and ES and the velocity you are trying to attain. Although groups do tell the picture. A primer change can make all the difference in the world when stretching out distances due to SD/ES. Measuring cartridge base is a good indicator too, if you have the micrometer tools to do that. Some cartridges do show pressure 'indicators' at bottom loading, this all relevant to a particular loading with all components coming into play. Those 'ridges' on the primers could be 'primer flow' due to the firing pin diameter vs. bolt face firing pin hole. Maybe needs to be bushed. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Too much pressure?
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