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Rifles, Reloading, Optics, Equipment
Reloading
What does this tell me?
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<blockquote data-quote="woods" data-source="post: 271309" data-attributes="member: 6042"><p>What this tells you is that the lands of the barrel has pushed your bullet into the case that far. What it does not tell you is how far into the lands you have jammed the bullet. That will depend upon how much neck tension you had between your case neck and bullet which will determine how much force was necessary to push the bullet down into the neck and thus how far into the lands you are jammed.</p><p></p><p>What you can do now is to seat the bullet a little deeper in the case neck, like .005", recolor the bullet where the marks are and rechamber the round. If you still get the marks on the bullet then seat an additional .005", recolor and rechamber until you no longer get the marks. That way you will get a better idea exactly where the lands are.</p><p></p><p>As far as sizing on the case shoulder, the way to determine that is to close your bolt without a case in the chamber and get a "feel" for how much effort is needed to lock the lugs. Then take your fired case and chamber it and see if it takes more effort to close the bolt. If it does then you need to set your die to push the shoulder back a little.</p><p></p><p>One thing you need to be careful of is that the amount of crush fit when chambering the sized case may change from the amount of crush fit on an unsized case. IOW, when your die contacts the case body and sizes it, the sizing of the body will push the shoulder forward and create a crush fit even though you did not have a crush fit on that same case when unsized. So you can neck size (if you have a neck sizer) if you do not have a crush fit on an unsized case, you can partial neck size a case and not create a crush fit, but if you use your full length sizer to size the case body you need to check for a crush fit after sizing.</p><p></p><p>A Hornady Headspace Gauge</p><p></p><p><a href="http://www.midwayusa.com/viewProduct/?productNumber=479704" target="_blank">MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator</a></p><p></p><p>which measures on the datum line of the shoulder</p><p></p><p><img src="http://img.photobucket.com/albums/v663/bwestfall/RELOADING/rimless.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>and attaches to your caliper</p><p></p><p><img src="http://img.photobucket.com/albums/v663/bwestfall/RELOADING/DSCN0060.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>is very useful for figuring out where to push your shoulder back to for a very slight crush fit or to push it back far enough where there is no contact but not so far that it overworks your brass.</p></blockquote><p></p>
[QUOTE="woods, post: 271309, member: 6042"] What this tells you is that the lands of the barrel has pushed your bullet into the case that far. What it does not tell you is how far into the lands you have jammed the bullet. That will depend upon how much neck tension you had between your case neck and bullet which will determine how much force was necessary to push the bullet down into the neck and thus how far into the lands you are jammed. What you can do now is to seat the bullet a little deeper in the case neck, like .005", recolor the bullet where the marks are and rechamber the round. If you still get the marks on the bullet then seat an additional .005", recolor and rechamber until you no longer get the marks. That way you will get a better idea exactly where the lands are. As far as sizing on the case shoulder, the way to determine that is to close your bolt without a case in the chamber and get a "feel" for how much effort is needed to lock the lugs. Then take your fired case and chamber it and see if it takes more effort to close the bolt. If it does then you need to set your die to push the shoulder back a little. One thing you need to be careful of is that the amount of crush fit when chambering the sized case may change from the amount of crush fit on an unsized case. IOW, when your die contacts the case body and sizes it, the sizing of the body will push the shoulder forward and create a crush fit even though you did not have a crush fit on that same case when unsized. So you can neck size (if you have a neck sizer) if you do not have a crush fit on an unsized case, you can partial neck size a case and not create a crush fit, but if you use your full length sizer to size the case body you need to check for a crush fit after sizing. A Hornady Headspace Gauge [url=http://www.midwayusa.com/viewProduct/?productNumber=479704]MidwayUSA - Hornady Lock-N-Load Headspace Gage 5 Bushing Set with Comparator[/url] which measures on the datum line of the shoulder [IMG]http://img.photobucket.com/albums/v663/bwestfall/RELOADING/rimless.jpg[/IMG] and attaches to your caliper [IMG]http://img.photobucket.com/albums/v663/bwestfall/RELOADING/DSCN0060.jpg[/IMG] is very useful for figuring out where to push your shoulder back to for a very slight crush fit or to push it back far enough where there is no contact but not so far that it overworks your brass. [/QUOTE]
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