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Rifles, Reloading, Optics, Equipment
Reloading
From a max load back to a resized case?
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<blockquote data-quote="Deleted member 46119" data-source="post: 779757"><p>I think you are asking a question that is somewhat difficult to answer.</p><p></p><p>Correct me if I don't get this right, I'm gonna restate your question:</p><p></p><p>What changes do I make to the powder charge to get the same POI from a new lot of brass that is not fire formed to my chamber?</p><p></p><p>If that is the question, it's a physics problem and it takes data, lots of data. All that data is something that may not be available. An example is "case volume".</p><p></p><p>There is the data of case volume of your fire formed brass vs. the case volume of your small base sized brass vs. dynamic case volume as the round goes through the burn, expansion, bullet release cycle in the chamber. </p><p></p><p>IMHO: All anyone can say is "If it were me, I'd..."</p><p></p><p>So, not recommending it to you but if it were me, I'd:</p><p></p><p>Make a 'short' ladder of 3 cartridges of each at .2 increments, starting 1grs below the known to work well load. Chron these and check POI. Pick the one that is closest to the known good load, assemble the remaining cartridges and shoot away.</p><p></p><p>If I had a "match", I'd stick with the already fire formed brass.</p></blockquote><p></p>
[QUOTE="Deleted member 46119, post: 779757"] I think you are asking a question that is somewhat difficult to answer. Correct me if I don't get this right, I'm gonna restate your question: What changes do I make to the powder charge to get the same POI from a new lot of brass that is not fire formed to my chamber? If that is the question, it's a physics problem and it takes data, lots of data. All that data is something that may not be available. An example is "case volume". There is the data of case volume of your fire formed brass vs. the case volume of your small base sized brass vs. dynamic case volume as the round goes through the burn, expansion, bullet release cycle in the chamber. IMHO: All anyone can say is "If it were me, I'd..." So, not recommending it to you but if it were me, I'd: Make a 'short' ladder of 3 cartridges of each at .2 increments, starting 1grs below the known to work well load. Chron these and check POI. Pick the one that is closest to the known good load, assemble the remaining cartridges and shoot away. If I had a "match", I'd stick with the already fire formed brass. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
From a max load back to a resized case?
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