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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="Mikecr" data-source="post: 395413" data-attributes="member: 1521"><p>Phorwath is right.</p><p>The reason field velocities/pressures go down with deeper seating, is that EARLY pressure(peak) is reduced as you move from the lands. The latter having a greater affect(to a point), than the very tiny bullet displacement changes in seating.</p><p>QL does not automatically compensate, but allows you to manually adjust for it, with 'starting pressure'. You should account for it with trial & error to match chrono velocities.</p><p>If it seems to suck that you would have to do this, try it with ANY other reloading system...</p><p></p><p>Thread starter, I'm curious, why did you change 'case length'? </p><p>This is not usual, and in doing so you must also adjust 'case capacity' as appropriate.</p><p>Again, this is a manual calibration.</p><p></p><p>As painful as it may seem at times, the true value in QL is in it's CALIBRATED results. Nothing else provides this for reloaders.</p><p></p><p>Other factors, some mentioned, are weighting factor, cross-sectional bore area, shank seating depth, starting pressure, powder temp, powder factors(per lot).</p><p>There are a lot of little details to watch, the writer of this program has himself missed, and you have to catch them & correct them.</p><p>Wrong bullet dimensions</p><p>Inconsistent cross-sectional bore area</p><p>Incorrect weighting factor(for cartridge)</p><p>And factors not automatically updating with changes(like case length to capacity).</p><p></p><p>So don't assume anything is actually correct until you've measured so across a chrono.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 395413, member: 1521"] Phorwath is right. The reason field velocities/pressures go down with deeper seating, is that EARLY pressure(peak) is reduced as you move from the lands. The latter having a greater affect(to a point), than the very tiny bullet displacement changes in seating. QL does not automatically compensate, but allows you to manually adjust for it, with 'starting pressure'. You should account for it with trial & error to match chrono velocities. If it seems to suck that you would have to do this, try it with ANY other reloading system... Thread starter, I'm curious, why did you change 'case length'? This is not usual, and in doing so you must also adjust 'case capacity' as appropriate. Again, this is a manual calibration. As painful as it may seem at times, the true value in QL is in it's CALIBRATED results. Nothing else provides this for reloaders. Other factors, some mentioned, are weighting factor, cross-sectional bore area, shank seating depth, starting pressure, powder temp, powder factors(per lot). There are a lot of little details to watch, the writer of this program has himself missed, and you have to catch them & correct them. Wrong bullet dimensions Inconsistent cross-sectional bore area Incorrect weighting factor(for cartridge) And factors not automatically updating with changes(like case length to capacity). So don't assume anything is actually correct until you've measured so across a chrono. [/QUOTE]
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Reloading
QL v3.6 just arrived and its conflicting info
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