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Rifles, Reloading, Optics, Equipment
Reloading
Quickload with Wildcats or Proprietary Cartridges
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<blockquote data-quote="MagnumManiac" data-source="post: 2321061" data-attributes="member: 10755"><p>Well, that is common because most hunting rifle barrels are totally different to a pressure testing SAAMI barrel.</p><p>Ever wondered why the book velocities are way faster than your own results?</p><p>I find the Pressure Trace to be very accurate for what I do with it. I take raw numbers from it, correlate that info with the velocity given and use those parameters to build loads.</p><p>A pressure barrel is way tighter in tolerance to any hunting rifle, hence the discrepancy.</p><p>Also, the books data is based on Maximum Average Pressure and the parameters are fairly tight, so even if 3 results are above the average, that load is not used and the previous lower load becomes max.</p><p>Internal ballistics is not precise and probably never will be until powders go from progressive burning to digressive burning, which there are only a few being used in military applications. I worked at ADI, the makers on Hodgdon powders and military arms ammo. There's more to pressure testing than what the books say.</p><p></p><p>Cheers.</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 2321061, member: 10755"] Well, that is common because most hunting rifle barrels are totally different to a pressure testing SAAMI barrel. Ever wondered why the book velocities are way faster than your own results? I find the Pressure Trace to be very accurate for what I do with it. I take raw numbers from it, correlate that info with the velocity given and use those parameters to build loads. A pressure barrel is way tighter in tolerance to any hunting rifle, hence the discrepancy. Also, the books data is based on Maximum Average Pressure and the parameters are fairly tight, so even if 3 results are above the average, that load is not used and the previous lower load becomes max. Internal ballistics is not precise and probably never will be until powders go from progressive burning to digressive burning, which there are only a few being used in military applications. I worked at ADI, the makers on Hodgdon powders and military arms ammo. There’s more to pressure testing than what the books say. Cheers. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Quickload with Wildcats or Proprietary Cartridges
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