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Rifles, Reloading, Optics, Equipment
Reloading
Brass Case Head Separation after 6 firings
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<blockquote data-quote="QuietTexan" data-source="post: 2533800" data-attributes="member: 116181"><p>Absolutes don't tend to work out well, gotta be careful throwing them around because some of us have practical experience with the exact opposite of what you're saying.</p><p></p><p>Cases can and will shorten when fireforming to a new chamber with less body taper. It's dependent on a number of factors, but sure enough I have a couple of chambers where you put in a loaded round, shoot it, and the case comes out shorter. I know this for a fact because I trim to a specific spec after resizing for fireforming, measure the cases get shorter after the first firing, then go back through and uniform the cases even shorter after they stabilize in their new form.</p><p></p><p>A big part of having a case get shorter at the neck instead of thinning out at the web is how the case and the rifle are set up for fireforming. A false shoulder is one way, hard jam of the bullet to the lands is another. Something as mundane as removing the ejector can change what part of the case stretches. Jamming a bullet with light neck tension isn't enough sometimes because the firing pin spring can jam the case forward. Takes some real thought to get the correct outcomes when forming.</p><p></p><p>Now something like a 300 WM you can shoot it and have the web stretch like you described very easily. This is the reason Peterson "long" brass exists - to give the handloader more case length to work with on the initial firing to avoid exactly what you describe of the case stretching instead of the shoulders blowing forward. The brass makes it possible to load new 300 WM brass more like how modern cases are loaded for the first firing and not having to even consider fireforming the case to get the shoulders all the way forward to where they can be bumped.</p><p></p><p>Then there's also a lot of thought that goes into processes for trimming cases if they do grow. My opinions fall generally along the lines that trimming too early in the case forming process (and/or coupling early trimming with excessively resizing cases) can induce the problem of inconsistent case lengths on subsequent firings. Also not inspecting cases before trimming to see how/why they're growing and if it's happening consistently/ uniformly destroys important information with the cutter.</p></blockquote><p></p>
[QUOTE="QuietTexan, post: 2533800, member: 116181"] Absolutes don't tend to work out well, gotta be careful throwing them around because some of us have practical experience with the exact opposite of what you're saying. Cases can and will shorten when fireforming to a new chamber with less body taper. It's dependent on a number of factors, but sure enough I have a couple of chambers where you put in a loaded round, shoot it, and the case comes out shorter. I know this for a fact because I trim to a specific spec after resizing for fireforming, measure the cases get shorter after the first firing, then go back through and uniform the cases even shorter after they stabilize in their new form. A big part of having a case get shorter at the neck instead of thinning out at the web is how the case and the rifle are set up for fireforming. A false shoulder is one way, hard jam of the bullet to the lands is another. Something as mundane as removing the ejector can change what part of the case stretches. Jamming a bullet with light neck tension isn't enough sometimes because the firing pin spring can jam the case forward. Takes some real thought to get the correct outcomes when forming. Now something like a 300 WM you can shoot it and have the web stretch like you described very easily. This is the reason Peterson "long" brass exists - to give the handloader more case length to work with on the initial firing to avoid exactly what you describe of the case stretching instead of the shoulders blowing forward. The brass makes it possible to load new 300 WM brass more like how modern cases are loaded for the first firing and not having to even consider fireforming the case to get the shoulders all the way forward to where they can be bumped. Then there's also a lot of thought that goes into processes for trimming cases if they do grow. My opinions fall generally along the lines that trimming too early in the case forming process (and/or coupling early trimming with excessively resizing cases) can induce the problem of inconsistent case lengths on subsequent firings. Also not inspecting cases before trimming to see how/why they're growing and if it's happening consistently/ uniformly destroys important information with the cutter. [/QUOTE]
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Brass Case Head Separation after 6 firings
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