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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6x55 A.I. questions
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<blockquote data-quote="sable tireur" data-source="post: 1508442" data-attributes="member: 27307"><p>It's not the amount of powder, it's the way the plasma is handled as it exits the case mouth. Long necks work better.</p><p></p><p>This is often touted by people who don't know and don't shoot these cartridges. The reason for keeping the long neck on the 6mm Rem then improving the shoulder is to enhance the life of the chamber throat. Instead of letting the plasma impinge on the sides of the throat as it exits the case, the longer neck and improved shoulder allow it to get past the throat, impinging on the barrel further past the throat. The shoulder angle reflects the plasma into the side of the longer neck, not into the throat. This is part of the reasoning behind the failure of the .243 Win. and the success of the 6mm Creedmoor. I've been shooting these improved version for a long time and I keep very good records after checking chambers with a borescope. </p><p></p><p>The reality is that you do Not have to make 6mm Rem. from 7x57 brass, it can be made from .257 Roberts (sometimes hard to find), 7x57 OR 6.5x57 RWS which is available through Huntington's. The RWS is the best brass in the world, better than the Lapua which so many seem to idolize. 100 cases will last a long time.</p><p></p><p>You have to set your dies up to match the go gauge for the reamer you have since all four cases are slightly different. You will neck down from whichever case you choose, twice from 7x57 once from either .257 or 6.5x57. Then use the expander ball to adjust the neck. The necks will likely need to be turned (at least they did for me) when using the 7x57 to get them consistent. Headspace based on the gauge as host cases will have shorter necks. Fireform by headspace as well as a light jam with the bullet. I have not had any case failures when following these standard procedures.</p></blockquote><p></p>
[QUOTE="sable tireur, post: 1508442, member: 27307"] It's not the amount of powder, it's the way the plasma is handled as it exits the case mouth. Long necks work better. This is often touted by people who don't know and don't shoot these cartridges. The reason for keeping the long neck on the 6mm Rem then improving the shoulder is to enhance the life of the chamber throat. Instead of letting the plasma impinge on the sides of the throat as it exits the case, the longer neck and improved shoulder allow it to get past the throat, impinging on the barrel further past the throat. The shoulder angle reflects the plasma into the side of the longer neck, not into the throat. This is part of the reasoning behind the failure of the .243 Win. and the success of the 6mm Creedmoor. I've been shooting these improved version for a long time and I keep very good records after checking chambers with a borescope. The reality is that you do Not have to make 6mm Rem. from 7x57 brass, it can be made from .257 Roberts (sometimes hard to find), 7x57 OR 6.5x57 RWS which is available through Huntington's. The RWS is the best brass in the world, better than the Lapua which so many seem to idolize. 100 cases will last a long time. You have to set your dies up to match the go gauge for the reamer you have since all four cases are slightly different. You will neck down from whichever case you choose, twice from 7x57 once from either .257 or 6.5x57. Then use the expander ball to adjust the neck. The necks will likely need to be turned (at least they did for me) when using the 7x57 to get them consistent. Headspace based on the gauge as host cases will have shorter necks. Fireform by headspace as well as a light jam with the bullet. I have not had any case failures when following these standard procedures. [/QUOTE]
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