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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="TommyBreaux" data-source="post: 2443122" data-attributes="member: 51951"><p>Mr. Slamotrutta, I have to ask you, why to do you tweak the case capacity to calibrate the load? That is the one thing that is easily measured and verified? In Mr. Long's paper, one of his suggestions to calibrate the load is to modify the bullet weight slightly. I don't understand that either. If you know the bullet weight and the bore diameter and case capacity why would you fudge them? None of those variables change with temperature to any great extent that would be measurable. On the other hand, Ba (Powder Burn Rate), is temperature dependent and varies powder lot to powder lot. So what difference does it make if you vary it +/_5% to get the load and the measured velocity at temperature to match. Starting Pressure, can be jump dependent depending upon whether the bullet is jammed or has clearance but it should be constant for that bullet in that gun. I have seen one equation where the initial starting pressure is dropped by so many psi for every two or three thousandths off of the lands the bullets are seated. I don't think that equation was verified by actual pressure barrel measurements in a ballistic lab. Just like too many cooks spoil the broth, too many variables cloud the results!</p><p></p><p>Thank you for your insights.</p></blockquote><p></p>
[QUOTE="TommyBreaux, post: 2443122, member: 51951"] Mr. Slamotrutta, I have to ask you, why to do you tweak the case capacity to calibrate the load? That is the one thing that is easily measured and verified? In Mr. Long's paper, one of his suggestions to calibrate the load is to modify the bullet weight slightly. I don't understand that either. If you know the bullet weight and the bore diameter and case capacity why would you fudge them? None of those variables change with temperature to any great extent that would be measurable. On the other hand, Ba (Powder Burn Rate), is temperature dependent and varies powder lot to powder lot. So what difference does it make if you vary it +/_5% to get the load and the measured velocity at temperature to match. Starting Pressure, can be jump dependent depending upon whether the bullet is jammed or has clearance but it should be constant for that bullet in that gun. I have seen one equation where the initial starting pressure is dropped by so many psi for every two or three thousandths off of the lands the bullets are seated. I don't think that equation was verified by actual pressure barrel measurements in a ballistic lab. Just like too many cooks spoil the broth, too many variables cloud the results! Thank you for your insights. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
QuickLOAD way off from reality. Solutions?
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