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The Basics, Starting Out
7PRC - Peterson brass - Redding bushing?
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<blockquote data-quote="huntinghuasna" data-source="post: 2841169" data-attributes="member: 109227"><p>I measure the neck wall thickness of several pieces of brass to come up with an average.</p><p>Then double that measurement, add OD of bullet then subtract for the amount of neck tension you want. Example: My 6.5 Creedmoor Lapua brass has an average neck wall thickness of 0.014". Bullet diameter is 0.264". I like 0.002" of interference fit/neck tension.</p><p></p><p> 0.014"</p><p> 0.014"</p><p>+0.264"</p><p>———-</p><p>=0.292"</p><p>-0.002"</p><p>———-</p><p>=0.290" bushing size for non-mandrel method.</p><p></p><p>This method does require a 0-1" tube micrometer. Mine is a SHARS with readings to 0.0001"</p><p>Measuring the OD of neck with bullet seated is the easiest if you have one. If starting from scratch I find the measurement method easier vs. prepping a new piece of brass, seating a bullet, measuring, pulling the bullet, and resizing that piece of brass.</p></blockquote><p></p>
[QUOTE="huntinghuasna, post: 2841169, member: 109227"] I measure the neck wall thickness of several pieces of brass to come up with an average. Then double that measurement, add OD of bullet then subtract for the amount of neck tension you want. Example: My 6.5 Creedmoor Lapua brass has an average neck wall thickness of 0.014". Bullet diameter is 0.264". I like 0.002" of interference fit/neck tension. 0.014" 0.014" +0.264" ———- =0.292" -0.002" ———- =0.290" bushing size for non-mandrel method. This method does require a 0-1" tube micrometer. Mine is a SHARS with readings to 0.0001" Measuring the OD of neck with bullet seated is the easiest if you have one. If starting from scratch I find the measurement method easier vs. prepping a new piece of brass, seating a bullet, measuring, pulling the bullet, and resizing that piece of brass. [/QUOTE]
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7PRC - Peterson brass - Redding bushing?
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