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Rifles, Reloading, Optics, Equipment
Reloading
Load density to case capacity to consistent vel, es and sd?
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<blockquote data-quote="MagnumManiac" data-source="post: 1595704" data-attributes="member: 10755"><p>I'll give you a scenario I encountered on a few occasions.</p><p>Load density, packing scheme and case volume all play a role in what is not only safe, but also in performance.</p><p>I loaded a few test rounds with powder X, went straight from loading bench to shooting bench and fired 10 shot strings of each powder load, got best accuracy half a grain from my manuals max load. Proceeded to load an additional 200 rounds with that load, a couple of weeks passed and I was headed to a match some 4+ hours away.</p><p>When I got there, I was able to fire a few sighters prior to the match the following Saturday.</p><p>Very first round locked the bolt solid, no amount of bashing was getting the bolt open and I didn't want to break the handle free, so I pulled the barrel, it was hand tight yet I couldn't budge it without a barrel vice and wrench set.</p><p>Anyway, when home, I pulled 10 rounds down, the first thing noticed was that the powder was well down the case, well below the shoulder/neck juncture. This was not the case when I dumped the powder from the measure. I dumped a few from the measure and the powder was a good way up the neck.</p><p>So, the powder had settled and the air gap had caused a pressure issue. I saw that dumping the powder and using a funnel made the powder settle differently, so I worked back up and discovered by swirling powder into the case and lowering the powder column, I had to drop the charge a full 2 grains to stay in safe pressures.</p><p>I have also seen a powder charge in new brass to be perfectly safe, but blow primers in once fired brass, all due to packing scheme and load density.</p><p>Hope this helps.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1595704, member: 10755"] I’ll give you a scenario I encountered on a few occasions. Load density, packing scheme and case volume all play a role in what is not only safe, but also in performance. I loaded a few test rounds with powder X, went straight from loading bench to shooting bench and fired 10 shot strings of each powder load, got best accuracy half a grain from my manuals max load. Proceeded to load an additional 200 rounds with that load, a couple of weeks passed and I was headed to a match some 4+ hours away. When I got there, I was able to fire a few sighters prior to the match the following Saturday. Very first round locked the bolt solid, no amount of bashing was getting the bolt open and I didn’t want to break the handle free, so I pulled the barrel, it was hand tight yet I couldn’t budge it without a barrel vice and wrench set. Anyway, when home, I pulled 10 rounds down, the first thing noticed was that the powder was well down the case, well below the shoulder/neck juncture. This was not the case when I dumped the powder from the measure. I dumped a few from the measure and the powder was a good way up the neck. So, the powder had settled and the air gap had caused a pressure issue. I saw that dumping the powder and using a funnel made the powder settle differently, so I worked back up and discovered by swirling powder into the case and lowering the powder column, I had to drop the charge a full 2 grains to stay in safe pressures. I have also seen a powder charge in new brass to be perfectly safe, but blow primers in once fired brass, all due to packing scheme and load density. Hope this helps. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Load density to case capacity to consistent vel, es and sd?
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