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Rifles, Reloading, Optics, Equipment
Reloading
Brass Separation Above Belt
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<blockquote data-quote="J E Custom" data-source="post: 1383222" data-attributes="member: 2736"><p>This is where we disagree with each other, (Which really does not matter) and as I have said. I don't want the bullet resting on anything and same goes for the case. If it is not centered it is not acceptable To ME and if that's ok for others, fine.</p><p></p><p>Depending on the cartridge design and its intended use, Freebore diameter is .0004 to .0025 larger than the bullet diameter. The .0004 to .0005 requires very careful loading and is paramount in my opinion. The best case scenario Is to have the bullet centered in this space, not touching one side or the other looking straight down the center of the bore. turning the neck and carful sizing will accomplish this and the use of a concentricity gauge will verify this. And if the case is a perfect fit in the chamber and against the bolt face where it cant move.</p><p></p><p>Another downside to having a loose fit in the chamber aside from any head space is when a case doesn't fit the chamber and when fired, it can cant the case head when fired and cause uneven web stretch even if very slight and over time start case head separation This is common on loose cases and excessive head space. One easy way to check for this phenomena is to take a fired case and load it into the chamber, If this occurred, it doesn't wont to chamber the same in most positions except where it was when fired and bolt closing will be different depending on the head stamp position of the case.</p><p></p><p>On semi auto firearms, these clearances must be enlarged in order to function correctly and normally brass life and accuracy are not the prime requirements as long as they are expectable. case head separations are not expectable in combat situations or dangerous game hunts because they will prevent the use of the weapon and its usefulness At the worst time. And also it is normally not a concern because the cases are not re used and the field gauge that limits the amount of head space in these weapons determines the rejection of this weapon for use while allowing the round to be chambered and fire under the worst conditions.</p><p></p><p>This is also why most cartridges for combat use are sized to small base dimensions Like the belted case body's are also smaller than required in order to chamber with little if any effort in a poorly maintained/cleaned chamber. But the belted cases can maintain head space even with the case body grossly undersized, This can lead to work hardening and case head separation if not minimized.</p><p></p><p>Another question was ask about the shoulder angle contributing to less chance of case head separation. Yes it does. The 40o shoulder appears to all but eliminate case head separation by controlling case lengthening. When sized properly, the cases with a 40o shoulder seem to grow very little in length. I have cartridge cases that have been loaded 8 to 10 times and have been annealed 2 to 3 times that have not changed length from the original trim length enough to re trim.</p><p></p><p>This means little if any brass thinning and the risk of case head separation. That's the reason that I load the way I do. I haven't had a case head separation for the last 40 years since I changed my loading </p><p>procedures to reflect the needs of the rifle. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p><p></p><p>J E CUSTOM</p></blockquote><p></p>
[QUOTE="J E Custom, post: 1383222, member: 2736"] This is where we disagree with each other, (Which really does not matter) and as I have said. I don't want the bullet resting on anything and same goes for the case. If it is not centered it is not acceptable To ME and if that's ok for others, fine. Depending on the cartridge design and its intended use, Freebore diameter is .0004 to .0025 larger than the bullet diameter. The .0004 to .0005 requires very careful loading and is paramount in my opinion. The best case scenario Is to have the bullet centered in this space, not touching one side or the other looking straight down the center of the bore. turning the neck and carful sizing will accomplish this and the use of a concentricity gauge will verify this. And if the case is a perfect fit in the chamber and against the bolt face where it cant move. Another downside to having a loose fit in the chamber aside from any head space is when a case doesn't fit the chamber and when fired, it can cant the case head when fired and cause uneven web stretch even if very slight and over time start case head separation This is common on loose cases and excessive head space. One easy way to check for this phenomena is to take a fired case and load it into the chamber, If this occurred, it doesn't wont to chamber the same in most positions except where it was when fired and bolt closing will be different depending on the head stamp position of the case. On semi auto firearms, these clearances must be enlarged in order to function correctly and normally brass life and accuracy are not the prime requirements as long as they are expectable. case head separations are not expectable in combat situations or dangerous game hunts because they will prevent the use of the weapon and its usefulness At the worst time. And also it is normally not a concern because the cases are not re used and the field gauge that limits the amount of head space in these weapons determines the rejection of this weapon for use while allowing the round to be chambered and fire under the worst conditions. This is also why most cartridges for combat use are sized to small base dimensions Like the belted case body's are also smaller than required in order to chamber with little if any effort in a poorly maintained/cleaned chamber. But the belted cases can maintain head space even with the case body grossly undersized, This can lead to work hardening and case head separation if not minimized. Another question was ask about the shoulder angle contributing to less chance of case head separation. Yes it does. The 40o shoulder appears to all but eliminate case head separation by controlling case lengthening. When sized properly, the cases with a 40o shoulder seem to grow very little in length. I have cartridge cases that have been loaded 8 to 10 times and have been annealed 2 to 3 times that have not changed length from the original trim length enough to re trim. This means little if any brass thinning and the risk of case head separation. That's the reason that I load the way I do. I haven't had a case head separation for the last 40 years since I changed my loading procedures to reflect the needs of the rifle. :) J E CUSTOM [/QUOTE]
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Brass Separation Above Belt
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