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Rifles, Reloading, Optics, Equipment
Reloading
Calculating Chamber Pressure
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<blockquote data-quote="MagnumManiac" data-source="post: 1002259" data-attributes="member: 10755"><p>If you want to predict chamber pressure, then Quickload is the easiest to use.</p><p>If you want to measure actual chamber pressure, do what I did and buy the Pressure Trace II system.</p><p></p><p>Mikecr,</p><p>Why do you say that a strain gauge has to be calibrated?</p><p>What do we 'calibrate' it to?</p><p>SAAMI uses "reference ammunition", we do not have access to this, and factory ammo can be ANY chamber pressure below maximum. All factory ammo I've tested, except a 300WSM, were well below maximum pressure. The 10 shots from a 300WSM were above maximum pressure, the average was 67,000psi, rounded down. If this stuff was precise, even SAAMI wouldn't have to use reference ammo, and then use correction factors to get the same pressure reading as the reference ammo barrel.</p><p>This system measures actual chamber pressure in PSI, there are no fudge factors, correction factors or other erroneous calculations, it is what it is. If you make an error in ANY of the variables you use to calibrate the calculating system, such as the diameter of the barrel around the chamber, you WILL get false readings.</p><p>I have found it a wonderful tool, and at $26 per rifle to glue on another piezo electric tab, it is quite cheap to use.</p><p></p><p>Cheers.</p><p>gun)</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1002259, member: 10755"] If you want to predict chamber pressure, then Quickload is the easiest to use. If you want to measure actual chamber pressure, do what I did and buy the Pressure Trace II system. Mikecr, Why do you say that a strain gauge has to be calibrated? What do we 'calibrate' it to? SAAMI uses "reference ammunition", we do not have access to this, and factory ammo can be ANY chamber pressure below maximum. All factory ammo I've tested, except a 300WSM, were well below maximum pressure. The 10 shots from a 300WSM were above maximum pressure, the average was 67,000psi, rounded down. If this stuff was precise, even SAAMI wouldn't have to use reference ammo, and then use correction factors to get the same pressure reading as the reference ammo barrel. This system measures actual chamber pressure in PSI, there are no fudge factors, correction factors or other erroneous calculations, it is what it is. If you make an error in ANY of the variables you use to calibrate the calculating system, such as the diameter of the barrel around the chamber, you WILL get false readings. I have found it a wonderful tool, and at $26 per rifle to glue on another piezo electric tab, it is quite cheap to use. Cheers. gun) [/QUOTE]
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Reloading
Calculating Chamber Pressure
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