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Rifles, Reloading, Optics, Equipment
Reloading
Can you satterlee/ladder test on virgin brass?
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<blockquote data-quote="MagnumManiac" data-source="post: 2419729" data-attributes="member: 10755"><p>I do seating depth and powder/primer combo tests on new brass because the node on powder doesn't matter doing this</p><p>All I'm looking for is rough combo's that give uniform groups with no vertical or horizontal to work off once I have a batch of brass that is stable and consistently bumps .001" back after sizing.</p><p>There is rarely any valid data to be taken from new brass.</p><p>The reasons are this.</p><p>Brass, even from the same lot, will expand and contract at different rates. The necks may expand and grow longer on one side more than the other, the case body and shoulder may also do the same, because cases are drawn into shape, this often causes one side to be thinner on the entirety of the case, this causes uneven expansion and, the only way to keep this from continuing is to fire form it in a way that the chamber is the governing factor on case movement and not the brass.</p><p>By firing it 3 times and only neck sizing for those 3 firings, all the uneven case expansion should have stopped and the brass is now stable.</p><p>One way to know if the brass is stable is to monitor how much uneven neck growth occurs upon sizing the necks. The first sizing can see an uneven neck growth of .010" or more on one side of the necks. When this stops, brass growth has also slowed and the internal shape of the brass is becoming uniform and stable.</p><p>Brass growth doesn't just flow forward, as many say, it goes in all directions moving to fill voids, which is why head separation can occur even when headspace is correct.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2419729, member: 10755"] I do seating depth and powder/primer combo tests on new brass because the node on powder doesn’t matter doing this All I’m looking for is rough combo’s that give uniform groups with no vertical or horizontal to work off once I have a batch of brass that is stable and consistently bumps .001” back after sizing. There is rarely any valid data to be taken from new brass. The reasons are this. Brass, even from the same lot, will expand and contract at different rates. The necks may expand and grow longer on one side more than the other, the case body and shoulder may also do the same, because cases are drawn into shape, this often causes one side to be thinner on the entirety of the case, this causes uneven expansion and, the only way to keep this from continuing is to fire form it in a way that the chamber is the governing factor on case movement and not the brass. By firing it 3 times and only neck sizing for those 3 firings, all the uneven case expansion should have stopped and the brass is now stable. One way to know if the brass is stable is to monitor how much uneven neck growth occurs upon sizing the necks. The first sizing can see an uneven neck growth of .010” or more on one side of the necks. When this stops, brass growth has also slowed and the internal shape of the brass is becoming uniform and stable. Brass growth doesn’t just flow forward, as many say, it goes in all directions moving to fill voids, which is why head separation can occur even when headspace is correct. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Can you satterlee/ladder test on virgin brass?
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