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Rifles, Reloading, Optics, Equipment
Reloading
Chamber pressures
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<blockquote data-quote="Mikecr" data-source="post: 721781" data-attributes="member: 1521"><p>If you're talking reasonable seating adjustments, deeper seating(by itself) increases pressure a relatively small amount due to reducing case capacity and increasing load density. Reaching the lands causes a bigger step change upward in pressure(+~8Kpsi) even after the smaller reduction of pressure with shallow seating to get there.</p><p>None of this is an issue as you would back down a bit with testing after any significant change.</p><p></p><p>But if you seat so deep that bullet bearing runs into neck-shoulder junction, and if you have a donut developing, pressures can again step change big upward. This would show up as bad performance first, followed by classic pressure signs.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 721781, member: 1521"] If you're talking reasonable seating adjustments, deeper seating(by itself) increases pressure a relatively small amount due to reducing case capacity and increasing load density. Reaching the lands causes a bigger step change upward in pressure(+~8Kpsi) even after the smaller reduction of pressure with shallow seating to get there. None of this is an issue as you would back down a bit with testing after any significant change. But if you seat so deep that bullet bearing runs into neck-shoulder junction, and if you have a donut developing, pressures can again step change big upward. This would show up as bad performance first, followed by classic pressure signs. [/QUOTE]
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