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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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<blockquote data-quote="Mikecr" data-source="post: 635971" data-attributes="member: 1521"><p>Richard I think you hold good perspectives on this.</p><p>Capacity checks and other efforts aren't required to get guns shooting well. It might not help a bit.</p><p>But I have never found a gun that didn't take efforts to get shooting better. And many guns will never shoot good without great efforts, or blind luck.</p><p></p><p>By the time a case has expanded to chamber dimensions, we are past a significant portion of the end results. The focus and efforts in capacity matching are to address an early region of internal ballistics.</p><p></p><p>Initial confinement affects powder ignition speed(regardless of burn rate), and so it affects the pressure curve, and barrel time resulting(with most combinations).</p><p>The affects of initial confinement(before expansion to chamber) can't be considered purely as a matter of load density either, as powder with the same load density also ignites differently within different initial volumes. Any obturation that changes ignition rate is significant to most of us.</p><p></p><p>It is common for reloaders to find that MV and/or POI changes from first firing of new brass to second firing. Well, unless using one of Bart's drilled from unicorn horn barrels.. Their brass might have weighed the same, and on both firings it went to chamber dimensions, but the results were different.</p><p>You can load up cases at ~80% load density and produce 30-50fps ES through firing with powder slid back in the case on firing, to powder slid forward. This with cases perfectly matched in capacity.</p><p>Anyone who's COW fireformed can see huge differences in ignition rate and pressure based on the tamping applied, even though this component(a tissue) might seem insignificant. It's important, taking you from 'womp' to 'boom', with no change other than initial confinement.</p><p></p><p>The notons that all is taken to chamber volume regardless, is outside of this subject. Too late.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 635971, member: 1521"] Richard I think you hold good perspectives on this. Capacity checks and other efforts aren't required to get guns shooting well. It might not help a bit. But I have never found a gun that didn't take efforts to get shooting better. And many guns will never shoot good without great efforts, or blind luck. By the time a case has expanded to chamber dimensions, we are past a significant portion of the end results. The focus and efforts in capacity matching are to address an early region of internal ballistics. Initial confinement affects powder ignition speed(regardless of burn rate), and so it affects the pressure curve, and barrel time resulting(with most combinations). The affects of initial confinement(before expansion to chamber) can't be considered purely as a matter of load density either, as powder with the same load density also ignites differently within different initial volumes. Any obturation that changes ignition rate is significant to most of us. It is common for reloaders to find that MV and/or POI changes from first firing of new brass to second firing. Well, unless using one of Bart's drilled from unicorn horn barrels.. Their brass might have weighed the same, and on both firings it went to chamber dimensions, but the results were different. You can load up cases at ~80% load density and produce 30-50fps ES through firing with powder slid back in the case on firing, to powder slid forward. This with cases perfectly matched in capacity. Anyone who's COW fireformed can see huge differences in ignition rate and pressure based on the tamping applied, even though this component(a tissue) might seem insignificant. It's important, taking you from 'womp' to 'boom', with no change other than initial confinement. The notons that all is taken to chamber volume regardless, is outside of this subject. Too late. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
procedure for measuring case volume
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