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Rifles, Reloading, Optics, Equipment
Reloading
Velocity difference between new brass and fired brass
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<blockquote data-quote="Mikecr" data-source="post: 1824828" data-attributes="member: 1521"><p>There is always some difference, and much of it depends on how sloppy your chamber clearances are. Given this, you should not count on or develop a load with brass until it's fire formed.</p><p></p><p>This is how it goes down; new brass expands on first firing, absorbing some of the pressure peak.</p><p>With that first firing, and a couple to follow, the brass is forever changed.</p><p>Subsequent pressure peaks are different, and higher when chamber clearances are less (and less absorbing).</p><p>When you change brands or even lots of same brand, it affects your load's peak pressure & timing.</p><p></p><p>Ideally, your reloading plan would not endure this issue.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1824828, member: 1521"] There is always some difference, and much of it depends on how sloppy your chamber clearances are. Given this, you should not count on or develop a load with brass until it's fire formed. This is how it goes down; new brass expands on first firing, absorbing some of the pressure peak. With that first firing, and a couple to follow, the brass is forever changed. Subsequent pressure peaks are different, and higher when chamber clearances are less (and less absorbing). When you change brands or even lots of same brand, it affects your load's peak pressure & timing. Ideally, your reloading plan would not endure this issue. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Velocity difference between new brass and fired brass
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