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Rifles, Reloading, Optics, Equipment
Reloading
Problems on the range..
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<blockquote data-quote="Malcolm C" data-source="post: 1355284" data-attributes="member: 7856"><p>I'll take a stab at this, but you should know that there are many more knowledgeable people on this forum whose input should be considered with more confidence. </p><p></p><p>I can think of three possible causes for your bolt closing problems with once fired, full length resized brass. </p><p></p><p>1. It is possible that your full length sizing die bottoms out before you effectively bump the shoulder back. This scenario would size the neck and body, but your brass shoulder could contact the corresponding chamber shoulder prior to fully camming the bolt closed. If this is the case, pardon the pun, the shoulder area of your smoked case should be cleaned by the chamber. </p><p></p><p>This hypothesis could be tested qualitatively by inserting a resized and "smoked" case into your action to note the interference positions. Please, consider that you may have to repeat such tests cleaning the chamber between tests to gain confidence in your results</p><p></p><p>2. Perhaps the expander ball in your die is too tight or not lubricated well enough in the neck and effectively stretches the neck and/or shoulder to longer dimensions when you run the ram back down. </p><p></p><p>This hypothesis could be tested first by comparing the length of a fired case before and after full length sizing -- if the lengths are consistent, this case has been ruled out. If the case length grows after sizing, smoke the case and insert it into your chamber. If the shoulder is stretching, you should see a bright ring on the shoulder area. If the neck is stretching, you should see the bright ring at the case mouth where it is contacting the end of the chamber.</p><p></p><p>3. It is possible that the die is flared too much at the mouth to size the web are near your case head enough to fit your chamber. </p><p></p><p>In this case, the bright ring will be around the web of the case.</p><p></p><p>4. If none of the above tests show you the cause of the hard bolt cam, you may have to start testing cases with seated bullets. Please, note that I have less confidence in this hypothesis and it should be relatively easy to identify. It is possible that the full length die reduces the ID of the neck to such a degree that the bullet is seated deeper in the new cases than the resized cases given the same amount of force. </p><p></p><p>If this is the case, you should notice a ring on your bullet jacket where it has been marred by the seating die. Alex Wheeler made a couple of good video about finding the lands and checking the chamber / die matching that can help with the diagnosis of your problem as seen in the following links.</p><p></p><p>[MEDIA=youtube]bfmc3B6wwG8[/MEDIA]</p><p></p><p>[MEDIA=youtube]TWmIwPwLyyg[/MEDIA]</p><p></p><p>Good luck.</p></blockquote><p></p>
[QUOTE="Malcolm C, post: 1355284, member: 7856"] I'll take a stab at this, but you should know that there are many more knowledgeable people on this forum whose input should be considered with more confidence. I can think of three possible causes for your bolt closing problems with once fired, full length resized brass. 1. It is possible that your full length sizing die bottoms out before you effectively bump the shoulder back. This scenario would size the neck and body, but your brass shoulder could contact the corresponding chamber shoulder prior to fully camming the bolt closed. If this is the case, pardon the pun, the shoulder area of your smoked case should be cleaned by the chamber. This hypothesis could be tested qualitatively by inserting a resized and "smoked" case into your action to note the interference positions. Please, consider that you may have to repeat such tests cleaning the chamber between tests to gain confidence in your results 2. Perhaps the expander ball in your die is too tight or not lubricated well enough in the neck and effectively stretches the neck and/or shoulder to longer dimensions when you run the ram back down. This hypothesis could be tested first by comparing the length of a fired case before and after full length sizing -- if the lengths are consistent, this case has been ruled out. If the case length grows after sizing, smoke the case and insert it into your chamber. If the shoulder is stretching, you should see a bright ring on the shoulder area. If the neck is stretching, you should see the bright ring at the case mouth where it is contacting the end of the chamber. 3. It is possible that the die is flared too much at the mouth to size the web are near your case head enough to fit your chamber. In this case, the bright ring will be around the web of the case. 4. If none of the above tests show you the cause of the hard bolt cam, you may have to start testing cases with seated bullets. Please, note that I have less confidence in this hypothesis and it should be relatively easy to identify. It is possible that the full length die reduces the ID of the neck to such a degree that the bullet is seated deeper in the new cases than the resized cases given the same amount of force. If this is the case, you should notice a ring on your bullet jacket where it has been marred by the seating die. Alex Wheeler made a couple of good video about finding the lands and checking the chamber / die matching that can help with the diagnosis of your problem as seen in the following links. [MEDIA=youtube]bfmc3B6wwG8[/MEDIA] [MEDIA=youtube]TWmIwPwLyyg[/MEDIA] Good luck. [/QUOTE]
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