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Rifles, Reloading, Optics, Equipment
Reloading
Sorting Brass and Bullets?
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<blockquote data-quote="Mikecr" data-source="post: 1308848" data-attributes="member: 1521"><p>Sinclair has a tool for this.</p><p>It's basically a plug you long seat in a case that you've over-trimmed(sacrificial). You chamber the round with this, and your chamber end seats the plug deeper. Extract the test round and measure for max case OAL.</p><p></p><p>If I can, I trim new brass to 0(right at max). When I fire the cases the necks pull back from a few thou up to 10thou depending on how much new shoulder angles pull them back. If they're consistent at that point, and under 5thou clearance, I'll re-trim to same length. Until then I don't trim again.</p><p>-5thou is a really good place. It reduces sooting seen on necks, which will usually lead to lower SD, and it pretty much eliminates carbon ring formation. But most folks don't manage trim length that close. Doing so with older cartridge designs, requiring more sizing, can be a continual chore.</p><p></p><p>I do not subscribe to trimming cases to same length, just for the sake of that, where it leads to excessive end clearance. I see that as another example(there are many) of counter productive actions people take, with assumptions that they're improving things.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1308848, member: 1521"] Sinclair has a tool for this. It's basically a plug you long seat in a case that you've over-trimmed(sacrificial). You chamber the round with this, and your chamber end seats the plug deeper. Extract the test round and measure for max case OAL. If I can, I trim new brass to 0(right at max). When I fire the cases the necks pull back from a few thou up to 10thou depending on how much new shoulder angles pull them back. If they're consistent at that point, and under 5thou clearance, I'll re-trim to same length. Until then I don't trim again. -5thou is a really good place. It reduces sooting seen on necks, which will usually lead to lower SD, and it pretty much eliminates carbon ring formation. But most folks don't manage trim length that close. Doing so with older cartridge designs, requiring more sizing, can be a continual chore. I do not subscribe to trimming cases to same length, just for the sake of that, where it leads to excessive end clearance. I see that as another example(there are many) of counter productive actions people take, with assumptions that they're improving things. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Sorting Brass and Bullets?
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