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Rifles, Reloading, Optics, Equipment
Reloading
QL v3.6 just arrived and its conflicting info
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<blockquote data-quote="Autorotate" data-source="post: 395394" data-attributes="member: 8073"><p>This is what I see as well.</p><p></p><p>When changing seat depth from the range of "at the lands" to .100 from the lands (in .020 increments), in two different chamberings, I've observed a decrease in velocity, with all other variables being the same.</p><p></p><p>My theory, based on the observations from my experiences with those two chamberings and chrono data is the change in pressure as a result of reducing case volume, is much less significant, than the decrease in pressure due to the bullet being farther from being engraved by the barrel rifling lands.</p><p></p><p>Until you load some rounds up, with safe charges, and go from "at the lands" to .100 from the lands, at your desired seating depth increment, and record the velocities.......you'll have a hard time convincing me otherwise that decreasing seating depth (in these ranges) doesn't decrease velocity.</p><p></p><p>I've never tested this at greater than .100 seating depth changes....maybe that's where the decrease in case volume offsets the lower "start pressure" (QL term, but I'm talking real world shooting not powder modeling software) that decreased seating depths offer.</p><p></p><p>Good discussion.</p></blockquote><p></p>
[QUOTE="Autorotate, post: 395394, member: 8073"] This is what I see as well. When changing seat depth from the range of "at the lands" to .100 from the lands (in .020 increments), in two different chamberings, I've observed a decrease in velocity, with all other variables being the same. My theory, based on the observations from my experiences with those two chamberings and chrono data is the change in pressure as a result of reducing case volume, is much less significant, than the decrease in pressure due to the bullet being farther from being engraved by the barrel rifling lands. Until you load some rounds up, with safe charges, and go from "at the lands" to .100 from the lands, at your desired seating depth increment, and record the velocities.......you'll have a hard time convincing me otherwise that decreasing seating depth (in these ranges) doesn't decrease velocity. I've never tested this at greater than .100 seating depth changes....maybe that's where the decrease in case volume offsets the lower "start pressure" (QL term, but I'm talking real world shooting not powder modeling software) that decreased seating depths offer. Good discussion. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
QL v3.6 just arrived and its conflicting info
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