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Rifles, Reloading, Optics, Equipment
Reloading
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<blockquote data-quote="QuietTexan" data-source="post: 2325224" data-attributes="member: 116181"><p>IMR 4955 is extruded and Superperformance is spherical. So SP will have a higher load density, which is how they get 4gn more powder into the case and get more velocity with it. </p><p></p><p>Hornady book data is generally speaking conservative, and they use SAAMI max COL which removes a significant amount of case volume from the equation for most chamberings. If you're longer than 2.600" I would go higher on the 4955 charge until you see something. You could also use a drop tube to get more of the 4955 into the case if you run out of volume before you hit pressure. </p><p></p><p>I never start at the bottom of the Hornady chart. Take the max charge and multiply by 93%, that will save you a significant amount of components.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2325224, member: 116181"] IMR 4955 is extruded and Superperformance is spherical. So SP will have a higher load density, which is how they get 4gn more powder into the case and get more velocity with it. Hornady book data is generally speaking conservative, and they use SAAMI max COL which removes a significant amount of case volume from the equation for most chamberings. If you're longer than 2.600" I would go higher on the 4955 charge until you see something. You could also use a drop tube to get more of the 4955 into the case if you run out of volume before you hit pressure. I never start at the bottom of the Hornady chart. Take the max charge and multiply by 93%, that will save you a significant amount of components. [/QUOTE]
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