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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
6.5 SS (Sherman Shortmag) Q@A
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<blockquote data-quote="adamjp" data-source="post: 1871600" data-attributes="member: 40749"><p>What pressure traces exist to document the pressures generated?</p><p></p><p>I agree with the idea of a long neck and slightly sharper shoulder improving throat life. If pressure is the same, then barrel life is directly influenced by heat generated by the explosion. A hot barrel wears faster than a cool barrel, a high pressure barrel wears faster than a low pressure one. Working to heat sink the throat area with the longer case neck, and working to give more direction to the pressure coming from case which is parallel to the case may also improve throat life.</p><p></p><p>I cannot agree with case design offering 'efficiency' which allows greater velocities than cases with slightly larger capacities at same or lower pressures. In short, velocity is determined by case capacity, pressure and powder. </p><p>If powder is the same (charge weight variance only) then capacity and pressure are the determinants of velocity.</p><p></p><p>To get 3200fps+ from 140gn bullets with a capacity just under the 6.5 SAUM the pressure is going to be higher than from the 6.5 SAUM case.</p><p></p><p>How much higher is the pressure?</p></blockquote><p></p>
[QUOTE="adamjp, post: 1871600, member: 40749"] What pressure traces exist to document the pressures generated? I agree with the idea of a long neck and slightly sharper shoulder improving throat life. If pressure is the same, then barrel life is directly influenced by heat generated by the explosion. A hot barrel wears faster than a cool barrel, a high pressure barrel wears faster than a low pressure one. Working to heat sink the throat area with the longer case neck, and working to give more direction to the pressure coming from case which is parallel to the case may also improve throat life. I cannot agree with case design offering 'efficiency' which allows greater velocities than cases with slightly larger capacities at same or lower pressures. In short, velocity is determined by case capacity, pressure and powder. If powder is the same (charge weight variance only) then capacity and pressure are the determinants of velocity. To get 3200fps+ from 140gn bullets with a capacity just under the 6.5 SAUM the pressure is going to be higher than from the 6.5 SAUM case. How much higher is the pressure? [/QUOTE]
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6.5 SS (Sherman Shortmag) Q@A
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