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Rifles, Reloading, Optics, Equipment
Reloading
6.5 cm lapua brass- ever seen this?
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<blockquote data-quote="Barrelnut" data-source="post: 1492480" data-attributes="member: 74902"><p>That's pretty common with brass that has been excessively sized. When you FL size brass and set the die up (as per makers instructions) the brass is pretty much sized back to SAAMI specs. This squeezes the brass and causes the braas to flow forward toward the neck. This is what causes the neck to grow. If you keep over sizing the brass this way, you end up with cases that look like the above. Have to be careful as they can separate in the chamber, when being fired. This is known as "case head separation". It can leave the forward part of the case in the chamber on extraction and allow hot gas to exit the rear of the chamber.</p><p></p><p>Lots of info on setting up reloading dies to only set the case shoulders back about 2 thousands when FL resizing. This way they fit the camber of the rifle they were fired in better and stop the excessive brass flow. They will usually only fit back in the rifle chamber they were fired in though.</p><p></p><p>Couple guys have some good diagrams of the phenomenon. They will probably post soon.</p></blockquote><p></p>
[QUOTE="Barrelnut, post: 1492480, member: 74902"] That's pretty common with brass that has been excessively sized. When you FL size brass and set the die up (as per makers instructions) the brass is pretty much sized back to SAAMI specs. This squeezes the brass and causes the braas to flow forward toward the neck. This is what causes the neck to grow. If you keep over sizing the brass this way, you end up with cases that look like the above. Have to be careful as they can separate in the chamber, when being fired. This is known as "case head separation". It can leave the forward part of the case in the chamber on extraction and allow hot gas to exit the rear of the chamber. Lots of info on setting up reloading dies to only set the case shoulders back about 2 thousands when FL resizing. This way they fit the camber of the rifle they were fired in better and stop the excessive brass flow. They will usually only fit back in the rifle chamber they were fired in though. Couple guys have some good diagrams of the phenomenon. They will probably post soon. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
6.5 cm lapua brass- ever seen this?
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