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Rifles, Reloading, Optics, Equipment
Reloading
Load Density, Bullet Jump, Case Air Space
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<blockquote data-quote="MagnumManiac" data-source="post: 2261702" data-attributes="member: 10755"><p>When I mentioned packing scheme of powder, I was actually talking about a full case that is slightly compressed or properly compressed.</p><p>If you dump powder straight from a measure, or swirl charge the powder into the case with a funnel, there will be a large difference in powder height.</p><p>As dumped charges are 'fluffy', you will see a significant difference in powder height across a full loading block. Swirling the charge leaves the powder height very uniform, you will not see any change in powder height and even though the 2 charges are the same in the case, the velocity will also be different and more uniform. A properly swirled charge will not settle even further even when vibrated.</p><p>A powder that settles through travel or handling may have some rounds in the node and others falling outside of it.</p><p>This is the same as those experiencing a difference in drop when shooting downhill compared to uphill. The air gap is altering the burn/ignition.</p><p>Factory ammo is crimped for a reason, it alters start pressure and they know they can utilise this when using a powder that doesn't fill the case. Believe it or not, if you run most factory ammo over a chrono they do run pretty uniform for such a large air gap left in the case. The difference without the crimp would be night and day.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2261702, member: 10755"] When I mentioned packing scheme of powder, I was actually talking about a full case that is slightly compressed or properly compressed. If you dump powder straight from a measure, or swirl charge the powder into the case with a funnel, there will be a large difference in powder height. As dumped charges are ‘fluffy’, you will see a significant difference in powder height across a full loading block. Swirling the charge leaves the powder height very uniform, you will not see any change in powder height and even though the 2 charges are the same in the case, the velocity will also be different and more uniform. A properly swirled charge will not settle even further even when vibrated. A powder that settles through travel or handling may have some rounds in the node and others falling outside of it. This is the same as those experiencing a difference in drop when shooting downhill compared to uphill. The air gap is altering the burn/ignition. Factory ammo is crimped for a reason, it alters start pressure and they know they can utilise this when using a powder that doesn’t fill the case. Believe it or not, if you run most factory ammo over a chrono they do run pretty uniform for such a large air gap left in the case. The difference without the crimp would be night and day. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Load Density, Bullet Jump, Case Air Space
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