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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth vs Pressure
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<blockquote data-quote="SBruce" data-source="post: 509706" data-attributes="member: 21068"><p>In my experience, seating bullets out to touching or jammed in the rifleing gives faster velocities (assumed to mean higher pressures). I do not own or use a strain guage so velocity and case measurements along with traditional pressure signs are all I have to go on. This also makes logical sense, because the bullets encounter resistance to movement the instant they begin to move. Whereas if they're seated back say .050", they have a chance to gain some momentum before they hit the barrel.</p><p> </p><p><u>I believe</u> where the conflicting information comes from; is when someone develops a max or near max load with bullets just kissing to back X distance from the rifling, and then they seat them in much deeper without changing the powder charge. In effect, decreasing the case capacity in some cases and thereby maybe increasing the pressure. I think this is more likely to happen with compressed loads or cases that are very full of powder.</p><p> </p><p>Again, seating out further seems to increase pressure. This has been my experience and consequently my opinion.</p><p> </p><p>If someone else has different experiences, please share.</p></blockquote><p></p>
[QUOTE="SBruce, post: 509706, member: 21068"] In my experience, seating bullets out to touching or jammed in the rifleing gives faster velocities (assumed to mean higher pressures). I do not own or use a strain guage so velocity and case measurements along with traditional pressure signs are all I have to go on. This also makes logical sense, because the bullets encounter resistance to movement the instant they begin to move. Whereas if they're seated back say .050", they have a chance to gain some momentum before they hit the barrel. [U]I believe[/U] where the conflicting information comes from; is when someone develops a max or near max load with bullets just kissing to back X distance from the rifling, and then they seat them in much deeper without changing the powder charge. In effect, decreasing the case capacity in some cases and thereby maybe increasing the pressure. I think this is more likely to happen with compressed loads or cases that are very full of powder. Again, seating out further seems to increase pressure. This has been my experience and consequently my opinion. If someone else has different experiences, please share. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Seating depth vs Pressure
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