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Rifles, Reloading, Optics, Equipment
Reloading
Quickload - usefull??
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<blockquote data-quote="dbooksta" data-source="post: 714676" data-attributes="member: 47963"><p><strong>Time to call BS on QuickLOAD</strong></p><p></p><p>65WSM has the right idea: QuickLOAD is useful for finding powders with good loading densities. But then, so is a spreadsheet with a list of bullet lengths, cartridge dimensions, and powder densities.</p><p></p><p>However, I no longer believe it can be used as an internal ballistics model. The further you go from old-school loads the worse it gets. Efficient subsonics like 300 BLK are off by 200fps. Heavy bullets in higher-twist barrels are also off by at least 200fps. Newer powders show greater variances than older powders.</p><p></p><p>The reason was explained to me by an exceptionally experienced tech at Hodgdon: The internal ballistics models require parameters that no powder manufacturer tests or provides. The only reason QuickLOAD got off the ground is that in the 1990s Hartmut Bromels got his hands on a bunch of such data the KGB had accumulated (at considerable cost). He has essentially been trying to data-fit new powders ever since, but the characteristics of smokeless powder have evolved too much for this to work outside of a narrow band.</p><p></p><p>Note that these errors invalidate QuickLOAD not only for out-of-manual load development but also for one of its other popular purposes: which is to find Optimal Barrel Times (OBT).</p></blockquote><p></p>
[QUOTE="dbooksta, post: 714676, member: 47963"] [b]Time to call BS on QuickLOAD[/b] 65WSM has the right idea: QuickLOAD is useful for finding powders with good loading densities. But then, so is a spreadsheet with a list of bullet lengths, cartridge dimensions, and powder densities. However, I no longer believe it can be used as an internal ballistics model. The further you go from old-school loads the worse it gets. Efficient subsonics like 300 BLK are off by 200fps. Heavy bullets in higher-twist barrels are also off by at least 200fps. Newer powders show greater variances than older powders. The reason was explained to me by an exceptionally experienced tech at Hodgdon: The internal ballistics models require parameters that no powder manufacturer tests or provides. The only reason QuickLOAD got off the ground is that in the 1990s Hartmut Bromels got his hands on a bunch of such data the KGB had accumulated (at considerable cost). He has essentially been trying to data-fit new powders ever since, but the characteristics of smokeless powder have evolved too much for this to work outside of a narrow band. Note that these errors invalidate QuickLOAD not only for out-of-manual load development but also for one of its other popular purposes: which is to find Optimal Barrel Times (OBT). [/QUOTE]
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Quickload - usefull??
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