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Rifles, Reloading, Optics, Equipment
Reloading
full length resizing
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<blockquote data-quote="AZShooter" data-source="post: 917407" data-attributes="member: 5219"><p>Edshock300,</p><p></p><p>"Thanks guys I've been reloading for a few years now, and have always set my die's to the shell holder. </p><p> it seems anytime my brass fails its the head space that cracks, so I guess its not something i am doing wrong."</p><p></p><p>YOU ARE DOING SOMETHING WRONG!</p><p></p><p> If the case is cracking just in front of the web the sizing is done incorrectly. I guess all earlier posts on how to set up the die was misinterpreted. </p><p></p><p>OVERSIZING IS A DANGEROUS PRACTICE AS THE BRASS CAN FAIL AT SOME POINT!</p><p></p><p>Here is why the case is splitting near case head. When the brass is fired it expands to conform to the shape of the chamber. There is a tiny bit of springback of the brass allowing easy extraction. </p><p></p><p>If the only the case's neck is sized to hold a bullet it can fit back into the chamber for at least one to possibly three sizings with some bolt closure resisitance. At that point body sizing is required to close the bolt. </p><p></p><p>Other type of actions require full length sizing for every reload. Autoloaders require some over sizing to ensure they will fit. </p><p></p><p>Bolt action hunting rifles that require a fast second shot may not work as easily with cases that fit as snugly as a neck sized case. This is where full length sizing is used. </p><p></p><p>If the die is set up so the brass's shape is over sized it will fit easily into the chamber BUT the brass will be over worked. The next firing will lengthen the case to again fit the chamber. Subsequent full length sizing will cause the brass to flow towards the neck area lengthening the case. The case's length will have to be trimmed. The brass flows from the area in front of the web and will do so until it gets so thin the case cracks (called incipient case separation) or breaks off! This is a dangerous situation as hot gasses will vent through the action! Many rifle designs will vent off these gasses but some rifles can send the gasses back into the shooter's eyes!!!!</p><p></p><p>It is imperative to either full length size a case correctly or throw it away after two or three full length sizings where the die has over sized a case. </p><p></p><p>Don't know how to make this more plain. </p><p></p><p>OVERSIZING IS A DANGEROUS PRACTICE AS THE BRASS CAN FAIL AT SOME POINT!</p><p></p><p></p><p> Having to trim several times will give a shooter a clue that the case is getting thin near the web. Sometimes a circular mark will show just infront of the case web a tell tale sign that the case is about to let go. </p><p></p><p> Hope this helps anyone with the problem of case head cracking or separation now know how to prevent it.</p></blockquote><p></p>
[QUOTE="AZShooter, post: 917407, member: 5219"] Edshock300, "Thanks guys I've been reloading for a few years now, and have always set my die's to the shell holder. it seems anytime my brass fails its the head space that cracks, so I guess its not something i am doing wrong." YOU ARE DOING SOMETHING WRONG! If the case is cracking just in front of the web the sizing is done incorrectly. I guess all earlier posts on how to set up the die was misinterpreted. OVERSIZING IS A DANGEROUS PRACTICE AS THE BRASS CAN FAIL AT SOME POINT! Here is why the case is splitting near case head. When the brass is fired it expands to conform to the shape of the chamber. There is a tiny bit of springback of the brass allowing easy extraction. If the only the case's neck is sized to hold a bullet it can fit back into the chamber for at least one to possibly three sizings with some bolt closure resisitance. At that point body sizing is required to close the bolt. Other type of actions require full length sizing for every reload. Autoloaders require some over sizing to ensure they will fit. Bolt action hunting rifles that require a fast second shot may not work as easily with cases that fit as snugly as a neck sized case. This is where full length sizing is used. If the die is set up so the brass's shape is over sized it will fit easily into the chamber BUT the brass will be over worked. The next firing will lengthen the case to again fit the chamber. Subsequent full length sizing will cause the brass to flow towards the neck area lengthening the case. The case's length will have to be trimmed. The brass flows from the area in front of the web and will do so until it gets so thin the case cracks (called incipient case separation) or breaks off! This is a dangerous situation as hot gasses will vent through the action! Many rifle designs will vent off these gasses but some rifles can send the gasses back into the shooter's eyes!!!! It is imperative to either full length size a case correctly or throw it away after two or three full length sizings where the die has over sized a case. Don't know how to make this more plain. OVERSIZING IS A DANGEROUS PRACTICE AS THE BRASS CAN FAIL AT SOME POINT! Having to trim several times will give a shooter a clue that the case is getting thin near the web. Sometimes a circular mark will show just infront of the case web a tell tale sign that the case is about to let go. Hope this helps anyone with the problem of case head cracking or separation now know how to prevent it. [/QUOTE]
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full length resizing
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