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Rifles, Reloading, Optics, Equipment
Reloading
7 SAUM Seating Heavies Long
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<blockquote data-quote="QuietTexan" data-source="post: 2567242" data-attributes="member: 116181"><p>This is already longer than the SAAMI COAL of 2.825". The part you might be missing is the part that probably doesn't apply in your specific case based on this longer COAL: how much more powder you can add from seating longer depends on how far the bullet is intruding on the powder column to begin with. If you aren't already, there's not much gain. When you run it in GRT, how much additional case fill % become available?</p><p></p><p>A 300 RUM is a good example of gains that can be had from seating longer because in factory form with a 3.600" COL about a third-to-half of the bearing surface is below the neck/shoulder junction, and the entire boat tail is below the shoulder/body junction. When I push the bullet out out to 3.820" there's a significant amount of case volume freed up now that the boat tail is at or above the neck/shoulder junction.</p><p></p><p>In the real world for this particular bullet/case combo going from 0.130" off the lands to 0.010" off the lands (0.120" further out of seating) gained 50 FPS at the same charge weight, or about 5% increase in case volume, depending on how you want to look at it. I gained about 4gn of additional powder space using 7828 SSC.</p><p></p><p>[ATTACH=full]376622[/ATTACH]</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2567242, member: 116181"] This is already longer than the SAAMI COAL of 2.825". The part you might be missing is the part that probably doesn't apply in your specific case based on this longer COAL: how much more powder you can add from seating longer depends on how far the bullet is intruding on the powder column to begin with. If you aren't already, there's not much gain. When you run it in GRT, how much additional case fill % become available? A 300 RUM is a good example of gains that can be had from seating longer because in factory form with a 3.600" COL about a third-to-half of the bearing surface is below the neck/shoulder junction, and the entire boat tail is below the shoulder/body junction. When I push the bullet out out to 3.820" there's a significant amount of case volume freed up now that the boat tail is at or above the neck/shoulder junction. In the real world for this particular bullet/case combo going from 0.130" off the lands to 0.010" off the lands (0.120" further out of seating) gained 50 FPS at the same charge weight, or about 5% increase in case volume, depending on how you want to look at it. I gained about 4gn of additional powder space using 7828 SSC. [ATTACH type="full" width="578px" alt="IMG_8116.jpg"]376622[/ATTACH] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
7 SAUM Seating Heavies Long
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