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Rifles, Reloading, Optics, Equipment
Reloading
Basic Reloading 101
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<blockquote data-quote="bigedp51" data-source="post: 1412818" data-attributes="member: 28965"><p>I remember when I got out of the service how simple things were reloading and just following the dies instructions. I had a new Remington 760 Gamemaster pump 30-06, a RCBS Rockchusker press and a green plastic Lyman vernier caliper. And I never had a single case head separation and the cases died with split necks.</p><p></p><p> I now have all sorts of gauges and reloading is slightly more complex. But I'm retired with nothing to do and all day to do it.</p><p></p><p>As long as your dies are a good match to your chamber, chances are you will not push the case shoulder back too far.</p><p></p><p>The only problem is that chambers and dies vary in size and the die you have "may" over or under resize your cases.</p><p></p><p>Example, I have a standard full length Lee .223 die that will resize the case smaller than my RCBS .223 small base die will. Meaning the Lee die makes the case smaller in diameter and the case shoulder can be bumped back shorter than with the small base die.</p><p></p><p>Bottom line, many reloaders get by without any gauges and do not have problems. "BUT" without any gauges its much harder to find the problem.</p><p></p><p>Below a Hornady cartridge case headspace gauge measuring a Lake City 5.56 case fired in my AR15 rifle. And after I measure the fired case length, the die is easy to adjust and bump the shoulder back .003. And if I just followed the dies instructions with the die making hard contact with the shell holder, the case shoulder would be pushed back .007. And this could cause case head separations.</p><p></p><p><img src="https://i.imgur.com/H0SXHH8.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>So in today world you have plus and minus tolerances for you chamber and resizing dies. And sometimes the tolerances do not match up and why we use gauges.</p><p></p><p>Below on a bolt action rifle you only need to bump the case shoulder back .001 to .002 below the red dotted line.</p><p>And if the die pushes the case shoulder too close to the green dotted line you can have case head separations. </p><p></p><p><img src="https://i.imgur.com/wm05ArY.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>Below shows head clearance when the cartridge is chambered. And your head clearance is the equivalent to the amount of shoulder bump. And the head clearance is how far the case must stretch to meet the bolt face when fired. And when your shoulder bump and head clearance is .001 to .002 the cases will last much longer with very little chance of case head separations. </p><p></p><p><img src="https://i.imgur.com/HK76WCp.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1412818, member: 28965"] I remember when I got out of the service how simple things were reloading and just following the dies instructions. I had a new Remington 760 Gamemaster pump 30-06, a RCBS Rockchusker press and a green plastic Lyman vernier caliper. And I never had a single case head separation and the cases died with split necks. I now have all sorts of gauges and reloading is slightly more complex. But I'm retired with nothing to do and all day to do it. As long as your dies are a good match to your chamber, chances are you will not push the case shoulder back too far. The only problem is that chambers and dies vary in size and the die you have "may" over or under resize your cases. Example, I have a standard full length Lee .223 die that will resize the case smaller than my RCBS .223 small base die will. Meaning the Lee die makes the case smaller in diameter and the case shoulder can be bumped back shorter than with the small base die. Bottom line, many reloaders get by without any gauges and do not have problems. "BUT" without any gauges its much harder to find the problem. Below a Hornady cartridge case headspace gauge measuring a Lake City 5.56 case fired in my AR15 rifle. And after I measure the fired case length, the die is easy to adjust and bump the shoulder back .003. And if I just followed the dies instructions with the die making hard contact with the shell holder, the case shoulder would be pushed back .007. And this could cause case head separations. [img]https://i.imgur.com/H0SXHH8.jpg[/img] So in today world you have plus and minus tolerances for you chamber and resizing dies. And sometimes the tolerances do not match up and why we use gauges. Below on a bolt action rifle you only need to bump the case shoulder back .001 to .002 below the red dotted line. And if the die pushes the case shoulder too close to the green dotted line you can have case head separations. [img]https://i.imgur.com/wm05ArY.gif[/img] Below shows head clearance when the cartridge is chambered. And your head clearance is the equivalent to the amount of shoulder bump. And the head clearance is how far the case must stretch to meet the bolt face when fired. And when your shoulder bump and head clearance is .001 to .002 the cases will last much longer with very little chance of case head separations. [img]https://i.imgur.com/HK76WCp.jpg[/img] [/QUOTE]
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Basic Reloading 101
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