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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
QuickLOAD way off from reality. Solutions?
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<blockquote data-quote="Veteran" data-source="post: 2443365" data-attributes="member: 118038"><p>I normally have my weighting factor set at .52 because shooting some compressed loads, and shooting loads with mostly greater than 93% case vol. fill, I believe some of my powder, especially the big chunky VV N series stick powders do not completely combust until a bit later in the process and follow the bullet at least a bit down the barrel. </p><p></p><p>From the QL users manual, 50% of the propellant mass is considered to move with the bullet. For typical cartridges, this is a good figure with which to work, so long as nothing better is available. I'm assuming a little more moves with the bullet , ie, 52% as described above. If you are shooting medium to low velocity charges at less than 90% case fill and using ball powders, maybe </p><p>it is down in the 40-50% range.</p><p></p><p>Weighing factor: # Input, represents energy losses from friction, heating and gas leakage; (Default is an estimated value based upon consideration of various cartridge parameters.) Most data records contain a 0.5. This means that 50% of the propellant mass is considered to move with the bullet. For typical cartridges, this is a good figure with which to work, so long as nothing better is available. Refer to the associated Bubble-help (tool tip) window for more information. When using so-called solid bullets, like Winchester FailSafeô, MEN-SFô, SFS, Hirtenberger ABCô or Barnes Xô, the user can set this value slightly higher (add 0.05). With moly-coated bullets (like NECO-Coatô processed) reduce this value about 0.02. Note that frictional loss percentage probably varies with jacket materials and barrel materials and bore profiles and this value is not constant along the path of the bullet through the bore. Nevertheless, in the current QuickLOAD version, a mean value of friction is assumed.</p></blockquote><p></p>
[QUOTE="Veteran, post: 2443365, member: 118038"] I normally have my weighting factor set at .52 because shooting some compressed loads, and shooting loads with mostly greater than 93% case vol. fill, I believe some of my powder, especially the big chunky VV N series stick powders do not completely combust until a bit later in the process and follow the bullet at least a bit down the barrel. From the QL users manual, 50% of the propellant mass is considered to move with the bullet. For typical cartridges, this is a good figure with which to work, so long as nothing better is available. I'm assuming a little more moves with the bullet , ie, 52% as described above. If you are shooting medium to low velocity charges at less than 90% case fill and using ball powders, maybe it is down in the 40-50% range. Weighing factor: # Input, represents energy losses from friction, heating and gas leakage; (Default is an estimated value based upon consideration of various cartridge parameters.) Most data records contain a 0.5. This means that 50% of the propellant mass is considered to move with the bullet. For typical cartridges, this is a good figure with which to work, so long as nothing better is available. Refer to the associated Bubble-help (tool tip) window for more information. When using so-called solid bullets, like Winchester FailSafeô, MEN-SFô, SFS, Hirtenberger ABCô or Barnes Xô, the user can set this value slightly higher (add 0.05). With moly-coated bullets (like NECO-Coatô processed) reduce this value about 0.02. Note that frictional loss percentage probably varies with jacket materials and barrel materials and bore profiles and this value is not constant along the path of the bullet through the bore. Nevertheless, in the current QuickLOAD version, a mean value of friction is assumed. [/QUOTE]
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QuickLOAD way off from reality. Solutions?
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