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Rifles, Reloading, Optics, Equipment
Reloading
Tikka T3X
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<blockquote data-quote="bigedp51" data-source="post: 1443544" data-attributes="member: 28965"><p>What I'm getting at is the more you squeeze the case the more it will grow when full length resized.</p><p>What I wanted you to do is try the +.008, +.006 competition shell holders and see if the case grows or becomes shorter.</p><p></p><p>Also if you just neck size a few times you will find the maximum case shoulder growth. And find the "true" chamber shoulder length.</p><p></p><p>Below on the left a new unfired rimmed .303 British case and the much shorter shoulder location. In the middle is a once fired case and on the left is a case full length resized twice. The case on the right started to separate because the case was full length resized. And if the case had minimum shoulder bump with the case headspacing on its shoulder it would not have stretched and thinned. The chamber was tighter than the GO gauge but the cases had thin rims and had .009 head clearance. Meaning the case stretched .009 each time it was fired and this was beyond the elastic limits of these Winchester cases. </p><p></p><p><img src="https://i.imgur.com/NHlR9jO.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p>The secret to rimmed and belted cases is to forget the rim and belt and let the case headspace on its shoulder. Chambers and dies vary in size. And sometimes you are forced to neck size only with long fat chambers when you have short skinny dies.</p><p></p><p><img src="https://i.imgur.com/sHgqVJR.gif" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p><p></p><p><img src="https://i.imgur.com/AQEQ9Vw.jpg" alt="" class="fr-fic fr-dii fr-draggable " style="" /></p></blockquote><p></p>
[QUOTE="bigedp51, post: 1443544, member: 28965"] What I'm getting at is the more you squeeze the case the more it will grow when full length resized. What I wanted you to do is try the +.008, +.006 competition shell holders and see if the case grows or becomes shorter. Also if you just neck size a few times you will find the maximum case shoulder growth. And find the "true" chamber shoulder length. Below on the left a new unfired rimmed .303 British case and the much shorter shoulder location. In the middle is a once fired case and on the left is a case full length resized twice. The case on the right started to separate because the case was full length resized. And if the case had minimum shoulder bump with the case headspacing on its shoulder it would not have stretched and thinned. The chamber was tighter than the GO gauge but the cases had thin rims and had .009 head clearance. Meaning the case stretched .009 each time it was fired and this was beyond the elastic limits of these Winchester cases. [IMG]https://i.imgur.com/NHlR9jO.jpg[/IMG] The secret to rimmed and belted cases is to forget the rim and belt and let the case headspace on its shoulder. Chambers and dies vary in size. And sometimes you are forced to neck size only with long fat chambers when you have short skinny dies. [IMG]https://i.imgur.com/sHgqVJR.gif[/IMG] [IMG]https://i.imgur.com/AQEQ9Vw.jpg[/IMG] [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Tikka T3X
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