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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Falling block help
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<blockquote data-quote="ntsqd" data-source="post: 2987070" data-attributes="member: 93138"><p>Bolt Thrust is a fairly easy calc to do simply, and a very difficult calc to do exactly. Peak pressure times case head internal area is the simple version. First .300 BLKO entry is the SAAMI spec, second is the pressure that I backed down until the bolt thrust was roughly the same as that of the .32-20</p><p></p><p> CUP Est. PSI Case Head Ø Case Head Area Simple Bolt Thrust</p><p></p><p>.32-20 16000 6320 0.353 0.0979 619</p><p></p><p>.38 SPL 17000 7840 0.379 0.1128 884</p><p></p><p>.300 BLKO 52000 61040 0.376 0.1110 6778</p><p></p><p>.300 BLKO 15500 5560 0.376 0.1110 617</p><p></p><p>Formula for approximating PSI from CUP found here: <a href="https://en.wikipedia.org/wiki/Copper_units_of_pressure" target="_blank">https://en.wikipedia.org/wiki/Copper_units_of_pressure</a></p><p></p><p>EDIT: Sorry, the formatting is PERFECT in editing mode, posting it screws it up.</p></blockquote><p></p>
[QUOTE="ntsqd, post: 2987070, member: 93138"] Bolt Thrust is a fairly easy calc to do simply, and a very difficult calc to do exactly. Peak pressure times case head internal area is the simple version. First .300 BLKO entry is the SAAMI spec, second is the pressure that I backed down until the bolt thrust was roughly the same as that of the .32-20 CUP Est. PSI Case Head Ø Case Head Area Simple Bolt Thrust .32-20 16000 6320 0.353 0.0979 619 .38 SPL 17000 7840 0.379 0.1128 884 .300 BLKO 52000 61040 0.376 0.1110 6778 .300 BLKO 15500 5560 0.376 0.1110 617 Formula for approximating PSI from CUP found here: [URL]https://en.wikipedia.org/wiki/Copper_units_of_pressure[/URL] EDIT: Sorry, the formatting is PERFECT in editing mode, posting it screws it up. [/QUOTE]
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Falling block help
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