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Rifles, Reloading, Optics, Equipment
Reloading
Can a load change its accuracy with time?
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<blockquote data-quote="Mikecr" data-source="post: 2177693" data-attributes="member: 1521"><p>I believe actual cold welding is a corrosion situation that takes more time than we're talking about here.</p><p></p><p>I think some of this is sized brass behavior over time.</p><p>When we size we add energy, putting the brass in a state that is not it's lowest energy level. All things in nature seek a lowest energy balance.</p><p>So you size the case body, it expands a bit when pulled from the die, but that expansion will continue over time. It isn't settled yet.</p><p>Hours, weeks, months. I've noticed it can take 4mos to settle.</p><p></p><p>As case bodies expand to close chamber wall clearance, pressure goes up with firing. This, because the case is absorbing less energy for firing expansion before hitting chamber walls.</p><p>It's load developed away from concern by folks who neck size only, but FL sizing people can hit on problem loads with it (over time).</p></blockquote><p></p>
[QUOTE="Mikecr, post: 2177693, member: 1521"] I believe actual cold welding is a corrosion situation that takes more time than we're talking about here. I think some of this is sized brass behavior over time. When we size we add energy, putting the brass in a state that is not it's lowest energy level. All things in nature seek a lowest energy balance. So you size the case body, it expands a bit when pulled from the die, but that expansion will continue over time. It isn't settled yet. Hours, weeks, months. I've noticed it can take 4mos to settle. As case bodies expand to close chamber wall clearance, pressure goes up with firing. This, because the case is absorbing less energy for firing expansion before hitting chamber walls. It's load developed away from concern by folks who neck size only, but FL sizing people can hit on problem loads with it (over time). [/QUOTE]
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Reloading
Can a load change its accuracy with time?
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