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Rifles, Reloading, Optics, Equipment
Reloading
Flattened primers?
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<blockquote data-quote="AZShooter" data-source="post: 872356" data-attributes="member: 5219"><p>I should have asked this earlier. Did your once fired cases exibit flattened primers too? Or did you acquire them already fired? </p><p></p><p>I encountered a 300 win that had a great deal of headspace. Didn't see any symptoms because the belt kept the case in place during firing allowing the shoulder to move forward. Never knew till I tried to fit some of the sized cases into a different 300 win mag. </p><p></p><p>To make a false shoulder you need a larger sizer ball to expand the neck of the case. You would use a 308 sizer ball. After the entire neck has been expanded run the case back into your 7mm Dakota die reducing some of the neck diameter back to 7mm to a point where the bolt could be closed but with some resistance. The false shoulder keeps the case head against the bolt face and will allow the case to stretch and fill up the shape of the larger chamber. </p><p></p><p>It would be interesting to fireform one case then section it to study the area just in front of the web to see if it was stretched to a narrower dimension. If you found that to be the situation, your chamber is too long to use safely. </p><p></p><p>You could section a fired case and look at the area in front in of the web as well. </p><p></p><p>Probably the best idea is to have a gunsmith reduce the headspace of the rifle. It isn't that hard and doesn't require a reamer. </p><p></p><p>Let us know what you end up doing. </p><p></p><p>Ross</p></blockquote><p></p>
[QUOTE="AZShooter, post: 872356, member: 5219"] I should have asked this earlier. Did your once fired cases exibit flattened primers too? Or did you acquire them already fired? I encountered a 300 win that had a great deal of headspace. Didn't see any symptoms because the belt kept the case in place during firing allowing the shoulder to move forward. Never knew till I tried to fit some of the sized cases into a different 300 win mag. To make a false shoulder you need a larger sizer ball to expand the neck of the case. You would use a 308 sizer ball. After the entire neck has been expanded run the case back into your 7mm Dakota die reducing some of the neck diameter back to 7mm to a point where the bolt could be closed but with some resistance. The false shoulder keeps the case head against the bolt face and will allow the case to stretch and fill up the shape of the larger chamber. It would be interesting to fireform one case then section it to study the area just in front of the web to see if it was stretched to a narrower dimension. If you found that to be the situation, your chamber is too long to use safely. You could section a fired case and look at the area in front in of the web as well. Probably the best idea is to have a gunsmith reduce the headspace of the rifle. It isn't that hard and doesn't require a reamer. Let us know what you end up doing. Ross [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Flattened primers?
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