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Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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<blockquote data-quote="Pdvdh" data-source="post: 1397984" data-attributes="member: 4191"><p>You only need a tool designed to measure 0.0001" accuracy if you need to identify 0.0001" case web expansion.</p><p></p><p>0.0001" case web expansion is not a problem, therefore you won't need a tool that measures accurately to 0.0001".</p><p></p><p>I've been measuring case web expansion for 30 years now with 0.001" dial and vernier calipers. Never felt needy for additional measurement accuracy.</p><p></p><p>The rule of thumb is 0.0005" case web expansion on a single firing of a new casing is ~maximum pressure load. Has to be the initial firing on the cartridge case. You shouldn't be having any big problem identifying 0.0005" case web expansion using a 0.001" caliper. It's 1/2 the distance between the indicator marks on the dial caliper. Or 1/2 the way across the indicator marks on the vernier hash marks.</p><p></p><p>If you want to identify 0.00005" expansion, then better buy a 0.0001" tool. But it's completely NOT necessary.</p></blockquote><p></p>
[QUOTE="Pdvdh, post: 1397984, member: 4191"] You only need a tool designed to measure 0.0001" accuracy if you need to identify 0.0001" case web expansion. 0.0001" case web expansion is not a problem, therefore you won't need a tool that measures accurately to 0.0001". I've been measuring case web expansion for 30 years now with 0.001" dial and vernier calipers. Never felt needy for additional measurement accuracy. The rule of thumb is 0.0005" case web expansion on a single firing of a new casing is ~maximum pressure load. Has to be the initial firing on the cartridge case. You shouldn't be having any big problem identifying 0.0005" case web expansion using a 0.001" caliper. It's 1/2 the distance between the indicator marks on the dial caliper. Or 1/2 the way across the indicator marks on the vernier hash marks. If you want to identify 0.00005" expansion, then better buy a 0.0001" tool. But it's completely NOT necessary. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Interpreting Pressure Signs from Velocity (260 Remington load dev)
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