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Rifles, Reloading, Optics, Equipment
Reloading
What does "safe" mean?
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<blockquote data-quote="Mikecr" data-source="post: 1385808" data-attributes="member: 1521"><p>Underbores like a 6.5x47L have the advantage in that you can jack up the pressures to the point of overriding many variables. That's why underbores like 6ppc or 30br are inherently accurate.</p><p>Knock em down to normal pressures and that advantage disappears.</p><p></p><p>But so far the 6.5x47L 130s represents the largest viable underbore. Any larger chamber area and you cannot easily tread so high in pressure.</p><p>Next up is the 260AI. But this would take a build plan that includes greater than normal barrel steel around the chamber. And it would be very competitive with 140s and the fastest filling powder.</p><p></p><p>There are many things that influence pressure problems and unsafe pressures. SAAMI cannot account for local conditions, and I'm pretty sure SAAMI provides what a manufacturer requests at times.</p><p>When Winchester wants SAAMI max at 65Kpsi for WSM/WSSM cartridges, they send SAAMI barrels they intend to use & sell. They have SAAMI confirm it's safe. Otherwise, SAAMI may have used smaller tenon barrels and came to lower MAX values.</p><p>So when you consider SAAMI MAX for cartridges small to large, there is not a solid trend there, other than overall -larger cartridges are rated at lower max pressures(all else equal). But again, that's not YOUR setup.</p></blockquote><p></p>
[QUOTE="Mikecr, post: 1385808, member: 1521"] Underbores like a 6.5x47L have the advantage in that you can jack up the pressures to the point of overriding many variables. That's why underbores like 6ppc or 30br are inherently accurate. Knock em down to normal pressures and that advantage disappears. But so far the 6.5x47L 130s represents the largest viable underbore. Any larger chamber area and you cannot easily tread so high in pressure. Next up is the 260AI. But this would take a build plan that includes greater than normal barrel steel around the chamber. And it would be very competitive with 140s and the fastest filling powder. There are many things that influence pressure problems and unsafe pressures. SAAMI cannot account for local conditions, and I'm pretty sure SAAMI provides what a manufacturer requests at times. When Winchester wants SAAMI max at 65Kpsi for WSM/WSSM cartridges, they send SAAMI barrels they intend to use & sell. They have SAAMI confirm it's safe. Otherwise, SAAMI may have used smaller tenon barrels and came to lower MAX values. So when you consider SAAMI MAX for cartridges small to large, there is not a solid trend there, other than overall -larger cartridges are rated at lower max pressures(all else equal). But again, that's not YOUR setup. [/QUOTE]
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What does "safe" mean?
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