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Rifles, Reloading, Optics, Equipment
Reloading
New to once fired brass....results.
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<blockquote data-quote="Mikecr" data-source="post: 1110763" data-attributes="member: 1521"><p>It can and this depends on your die -vs- chamber. </p><p>I cringe at the term 'FL sizing' as I picture off the shelf dies mutating brass to pure junk.. True FL sizing also sizes the entire neck length which is a horrible thing to do.</p><p>In contrast, custom honed FL dies, matched with a good chamber/plan, provide the very best in sizing.</p><p>Personally, I bump shoulders and partial NS only. Works great for me.</p><p></p><p>I've resisted the observation that new or heavily sized(big clearance) brass produces lower pressures because in certain aspects(like initial capacity & load density) this makes no sense. But I've taken my schooling and concede that it's true. </p><p>On firing, a case that has distant expansion to meet the chamber walls is absorbing some peak energy in doing so. </p><p>Brass that is fitted with relatively tight chamber clearances will produce higher pressure(and usually velocity) for a given load -w/resp to looser brass.</p><p>While this new/loose brass energy absorption seems an actual benefit with some combinations, I am confident this wouldn't pass tests across the gamut of cartridges we shoot. Consistent dimensions mean consistent capacity and load density. This is what I want before doing any load development.</p><p>If it turns out lower pressure/MV shoots better for me, I'll find this in development as powder adjusted rather than through brass sizing. </p><p></p><p>A 30-06 is a poor cartridge reloading-wise, compared to all the improved cartridges of late. It's long for capacity, with high body taper and low shoulder angles. Brass does roll(often called flow) on firing a 30-06, so it changes with every shot and you will have to FL size it, trim it, anneal it, and replace it..</p><p>With something like a 7SAUM and control over it's chamber and a plan, you would have none of this changing. It's brass would not flow on firing, or roll on FL sizing(because you would not be heavily FL sizing), so there would be no trimming, and no annealing. Add rational load pressures(<65Kpsi) and it's cases could last in stable dimensions indefinitely w/bumping/partial NS only.</p><p>I bring up this comparison so that you'll recognize that common notions do not always apply to the circumstances at hand.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1110763, member: 1521"] It can and this depends on your die -vs- chamber. I cringe at the term 'FL sizing' as I picture off the shelf dies mutating brass to pure junk.. True FL sizing also sizes the entire neck length which is a horrible thing to do. In contrast, custom honed FL dies, matched with a good chamber/plan, provide the very best in sizing. Personally, I bump shoulders and partial NS only. Works great for me. I've resisted the observation that new or heavily sized(big clearance) brass produces lower pressures because in certain aspects(like initial capacity & load density) this makes no sense. But I've taken my schooling and concede that it's true. On firing, a case that has distant expansion to meet the chamber walls is absorbing some peak energy in doing so. Brass that is fitted with relatively tight chamber clearances will produce higher pressure(and usually velocity) for a given load -w/resp to looser brass. While this new/loose brass energy absorption seems an actual benefit with some combinations, I am confident this wouldn't pass tests across the gamut of cartridges we shoot. Consistent dimensions mean consistent capacity and load density. This is what I want before doing any load development. If it turns out lower pressure/MV shoots better for me, I'll find this in development as powder adjusted rather than through brass sizing. A 30-06 is a poor cartridge reloading-wise, compared to all the improved cartridges of late. It's long for capacity, with high body taper and low shoulder angles. Brass does roll(often called flow) on firing a 30-06, so it changes with every shot and you will have to FL size it, trim it, anneal it, and replace it.. With something like a 7SAUM and control over it's chamber and a plan, you would have none of this changing. It's brass would not flow on firing, or roll on FL sizing(because you would not be heavily FL sizing), so there would be no trimming, and no annealing. Add rational load pressures(<65Kpsi) and it's cases could last in stable dimensions indefinitely w/bumping/partial NS only. I bring up this comparison so that you'll recognize that common notions do not always apply to the circumstances at hand. [/QUOTE]
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Reloading
New to once fired brass....results.
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