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Rifles, Reloading, Optics, Equipment
Reloading
weight sorting brass, Now what?
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<blockquote data-quote="918v" data-source="post: 1171312" data-attributes="member: 84964"><p>I weight sort and have found a correlation between case weight and case volume in brass fired in my chamber. Water volume sorting of virgin brass is a waste of time. They are made on multiple machines and have different external dimensions, usually in shoulder length and body diameter. Naturally they will have different internal volumes. Water test fired brass and you'll see a pretty close relationship to case weight. </p><p></p><p>Why is this important? ES. Case volume affects pressure. Variable pressure increases ES. Second, heavier cases have thicker necks. Thicker necks increase neck tension. Variable neck tension increases ES. </p><p></p><p>But sorting 308 brass into half-grain lots for hunting purposes is too anal. Do three grain lots instead. That's how Lapua does it. That's how ATK does it with M118LR sniper ammo.</p></blockquote><p></p>
[QUOTE="918v, post: 1171312, member: 84964"] I weight sort and have found a correlation between case weight and case volume in brass fired in my chamber. Water volume sorting of virgin brass is a waste of time. They are made on multiple machines and have different external dimensions, usually in shoulder length and body diameter. Naturally they will have different internal volumes. Water test fired brass and you'll see a pretty close relationship to case weight. Why is this important? ES. Case volume affects pressure. Variable pressure increases ES. Second, heavier cases have thicker necks. Thicker necks increase neck tension. Variable neck tension increases ES. But sorting 308 brass into half-grain lots for hunting purposes is too anal. Do three grain lots instead. That's how Lapua does it. That's how ATK does it with M118LR sniper ammo. [/QUOTE]
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weight sorting brass, Now what?
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