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Rifles, Reloading, Optics, Equipment
Reloading
Am I about to blow my face off?
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<blockquote data-quote="sfdoc2000" data-source="post: 2120324" data-attributes="member: 76742"><p>Agree with MILO-2, that using QL with the base numbers you have gives a max chamber pressure of 61,714 psi. This is still in the blue range, not quite for the red, but this pressure may be too high for your brass. Measuring fired case volume can make a considerable difference in chamber pressure. At least you are running a long COAL which increases the cartridge volume and reduces the relative chamber pressure versus a fully seated bullet unless you are jamming the bullet into the lands. Good brass such as Lapua or Nosler can withstand higher pressures but this is where pressure signs such as flattened primers and base marks need to be looked at carefully. Also remember that the burn rate coefficient actually increases with increasing chamber pressure and temperature so there is a non linear relationship between charge volume and pressure at higher loads. Quickloads is a guide but there are so many variables that one cannot just look at the numbers given with full certainty. Finally for a 26 inch barrel you are between OBT nodes with your velocities and may want to consider a change in bullet weight, powder, brass, etc. Do a good ladder test to see where your barrel timing is optimal.</p></blockquote><p></p>
[QUOTE="sfdoc2000, post: 2120324, member: 76742"] Agree with MILO-2, that using QL with the base numbers you have gives a max chamber pressure of 61,714 psi. This is still in the blue range, not quite for the red, but this pressure may be too high for your brass. Measuring fired case volume can make a considerable difference in chamber pressure. At least you are running a long COAL which increases the cartridge volume and reduces the relative chamber pressure versus a fully seated bullet unless you are jamming the bullet into the lands. Good brass such as Lapua or Nosler can withstand higher pressures but this is where pressure signs such as flattened primers and base marks need to be looked at carefully. Also remember that the burn rate coefficient actually increases with increasing chamber pressure and temperature so there is a non linear relationship between charge volume and pressure at higher loads. Quickloads is a guide but there are so many variables that one cannot just look at the numbers given with full certainty. Finally for a 26 inch barrel you are between OBT nodes with your velocities and may want to consider a change in bullet weight, powder, brass, etc. Do a good ladder test to see where your barrel timing is optimal. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Am I about to blow my face off?
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