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Rifles, Reloading, Optics, Equipment
Reloading
Brass Life
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<blockquote data-quote="Jon A" data-source="post: 116987" data-attributes="member: 319"><p>Bart, a bigger round is going to work the brass more at the same pressure. It just will.</p><p></p><p>Take a look at bolt thrust which goes up with the square of the interior case diameter. Even with appropriately thickened brass to arrive at the same stress ratio for pressure in the brass itself you're left with a larger total force in the end. This force is going to deflect the same action at the boltface more than a smaller round at the same pressure. There's no way to avoid it. This encourages more brass growth.</p><p></p><p>Same deal in the radial direction. If you look at the equations used with strain gauges and understand what they're actually telling you, they're telling you an identical barrel in 300 RUM will be "stretched" at the shot more than a .308 even at identical chamber pressures. </p><p></p><p>To expect brass life in one to apply to the other at the same pressures (300 RUM is 65000 psi <em>average</em> BTW) is to have unreasonable expectations.</p></blockquote><p></p>
[QUOTE="Jon A, post: 116987, member: 319"] Bart, a bigger round is going to work the brass more at the same pressure. It just will. Take a look at bolt thrust which goes up with the square of the interior case diameter. Even with appropriately thickened brass to arrive at the same stress ratio for pressure in the brass itself you're left with a larger total force in the end. This force is going to deflect the same action at the boltface more than a smaller round at the same pressure. There's no way to avoid it. This encourages more brass growth. Same deal in the radial direction. If you look at the equations used with strain gauges and understand what they're actually telling you, they're telling you an identical barrel in 300 RUM will be "stretched" at the shot more than a .308 even at identical chamber pressures. To expect brass life in one to apply to the other at the same pressures (300 RUM is 65000 psi [i]average[/i] BTW) is to have unreasonable expectations. [/QUOTE]
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