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Rifles, Reloading, Optics, Equipment
Reloading
Pressure signs
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<blockquote data-quote="Mikecr" data-source="post: 2239853" data-attributes="member: 1521"><p>There is a difference between a pressure 'sign'(a sign of high pressure), and a pressure 'problem'(something often manifesting with normal pressure). For instance, a mis-timed bolt/action can cause difficult extraction/bolt turn without pressure signs. Someone mentioned oil in the chamber, and that is an example problem that could challenge normal extraction with relatively low pressure loads. Primers can flatten at normal pressures if your headspace is too high. If you run a load near problem pressures normally, then it doesn't take much(other than higher pressure) to run into problems.</p><p></p><p>What I'm suggesting is that a single problem, may not be a sign of excess pressure.</p><p>In my experience, excess pressure shows up all over the place. It's actually a test I run with every new chamber, brass lot, and new load development. I creep into what I call MyMax load, and log it.</p><p>I may hit problems on the way up, which I'll troubleshoot & fix before continuing upward. Then I'll hit a pressure sign, then a confirmatory sign, and stop. It's purely pressure. I love my QuickLoad/chrono in that they truly help with confirmatory information, when a particular combination may be concealing a sign..</p><p></p><p>Fired brass does produce higher pressure over new brass from a given load. This is one of many reasons to do load development with brass that is fully fire formed to stable, and not until then.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2239853, member: 1521"] There is a difference between a pressure 'sign'(a sign of high pressure), and a pressure 'problem'(something often manifesting with normal pressure). For instance, a mis-timed bolt/action can cause difficult extraction/bolt turn without pressure signs. Someone mentioned oil in the chamber, and that is an example problem that could challenge normal extraction with relatively low pressure loads. Primers can flatten at normal pressures if your headspace is too high. If you run a load near problem pressures normally, then it doesn't take much(other than higher pressure) to run into problems. What I'm suggesting is that a single problem, may not be a sign of excess pressure. In my experience, excess pressure shows up all over the place. It's actually a test I run with every new chamber, brass lot, and new load development. I creep into what I call MyMax load, and log it. I may hit problems on the way up, which I'll troubleshoot & fix before continuing upward. Then I'll hit a pressure sign, then a confirmatory sign, and stop. It's purely pressure. I love my QuickLoad/chrono in that they truly help with confirmatory information, when a particular combination may be concealing a sign.. Fired brass does produce higher pressure over new brass from a given load. This is one of many reasons to do load development with brass that is fully fire formed to stable, and not until then. [/QUOTE]
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