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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Seating depth mystery!
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<blockquote data-quote="Mikecr" data-source="post: 394712" data-attributes="member: 1521"><p>It could be where peak pressure is occuring in the powder's burn curve. </p><p>Could probably see it well with a strain gage.</p><p></p><p>At 10thou, there is more case capacity per powder, less efficient peaking ->lower pressure</p><p>At 40thou, there may be very efficient peaking of the burn curve, with slightly reduced case capacity</p><p>At 100thou, there is less case capacity for higher pressure, but again inefficient peaking of the burn curve, because the bullet hesitates little through land engravement(no peak).</p><p>All of this with YOUR exact conditions, and not applying to anyone else really(why would it?).</p><p>This is why you try a few powders in load development.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 394712, member: 1521"] It could be where peak pressure is occuring in the powder's burn curve. Could probably see it well with a strain gage. At 10thou, there is more case capacity per powder, less efficient peaking ->lower pressure At 40thou, there may be very efficient peaking of the burn curve, with slightly reduced case capacity At 100thou, there is less case capacity for higher pressure, but again inefficient peaking of the burn curve, because the bullet hesitates little through land engravement(no peak). All of this with YOUR exact conditions, and not applying to anyone else really(why would it?). This is why you try a few powders in load development. [/QUOTE]
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Seating depth mystery!
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