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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Wildcat ?? Case pressure
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<blockquote data-quote="MagnumManiac" data-source="post: 1099888" data-attributes="member: 10755"><p>The general concensus for wildcat pressures is a misnomer. Example, the 30-06 is loaded, and quoted by SAAMI, at lower pressures than either the 25-06 or 270 Win, even though the brass cases are somewhat identical apart from calibre.</p><p>Also, the 257 Bob is downloaded in factory loads, so too is it's parent the 7x57 Mauser. Either case loaded in Europe has much higher pressure, on par with the 30-06 roughly.</p><p>When talking about 'improved cases', the extra case capacity is supposed to give the higher velocity, pressure is SUPPOSED TO STAY THE SAME AS THE PARENT ROUND.</p><p>I have a couple of AI cartridges, 22-250 AI and 257AI, I run both at the same pressures as the parent cases, except for the 257, I have brought pressures up to 60, 000psi in my loads. Having a Pressure Trace allows me to do this, but even before I owned it, I was loading until excessive pressure signs would exhibit, then back off 3%. Those loads, after pressure testing, were still above 60, 000psi, so I dropped them back another 2%, which brought them just under 60, 000psi.</p><p>If original 257 Bob brass, without the so-called +P web thickness increase, can withstand those pressures, why is it loaded to around 40, 000psi by the factories?</p><p>I've never understood this.</p><p>Without pressure testing equipment, the only way to know that you're loading safely, is either with tested published data, or a program like Quickload, but it must be understood that QL is NOT a substitute for published data, it only PREDICTS the pressure generated from the PARAMETERS YOU FEED INTO IT.</p><p></p><p>Cheers.</p><p>lightbulb</p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1099888, member: 10755"] The general concensus for wildcat pressures is a misnomer. Example, the 30-06 is loaded, and quoted by SAAMI, at lower pressures than either the 25-06 or 270 Win, even though the brass cases are somewhat identical apart from calibre. Also, the 257 Bob is downloaded in factory loads, so too is it's parent the 7x57 Mauser. Either case loaded in Europe has much higher pressure, on par with the 30-06 roughly. When talking about 'improved cases', the extra case capacity is supposed to give the higher velocity, pressure is SUPPOSED TO STAY THE SAME AS THE PARENT ROUND. I have a couple of AI cartridges, 22-250 AI and 257AI, I run both at the same pressures as the parent cases, except for the 257, I have brought pressures up to 60, 000psi in my loads. Having a Pressure Trace allows me to do this, but even before I owned it, I was loading until excessive pressure signs would exhibit, then back off 3%. Those loads, after pressure testing, were still above 60, 000psi, so I dropped them back another 2%, which brought them just under 60, 000psi. If original 257 Bob brass, without the so-called +P web thickness increase, can withstand those pressures, why is it loaded to around 40, 000psi by the factories? I've never understood this. Without pressure testing equipment, the only way to know that you're loading safely, is either with tested published data, or a program like Quickload, but it must be understood that QL is NOT a substitute for published data, it only PREDICTS the pressure generated from the PARAMETERS YOU FEED INTO IT. Cheers. lightbulb [/QUOTE]
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Wildcat ?? Case pressure
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