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Rifles, Reloading, Optics, Equipment
Reloading
Headspace 10-round sample
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<blockquote data-quote="MagnumManiac" data-source="post: 1421282" data-attributes="member: 10755"><p>Once fired brass will not give you accurate measurement, neither will a Wilson gauge.</p><p></p><p>You need to fire the same brass with neck sizing only for at least 3 firings or until a fired case is difficult to chamber on bolt turn down.</p><p>Due to brass springback, your measurements could be .002"-.004" below the ACTUAL chamber length.</p><p>I used to think once fired brass would be 'close enough', often it isn't. If you take a chamber cast, you will see the difference.</p><p></p><p>Also, the most accurate tool for measuring fired brass I have ever used is the RCBS Precision Mic. Easy to use, as with the Hornady comparator it is easy to get erroneous results from the case being tipped on the vernier, the Precision Mic simply screws onto the case and is very accurate and easy to read.</p><p></p><p>Cheers.</p><p><img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="MagnumManiac, post: 1421282, member: 10755"] Once fired brass will not give you accurate measurement, neither will a Wilson gauge. You need to fire the same brass with neck sizing only for at least 3 firings or until a fired case is difficult to chamber on bolt turn down. Due to brass springback, your measurements could be .002”-.004” below the ACTUAL chamber length. I used to think once fired brass would be ‘close enough’, often it isn’t. If you take a chamber cast, you will see the difference. Also, the most accurate tool for measuring fired brass I have ever used is the RCBS Precision Mic. Easy to use, as with the Hornady comparator it is easy to get erroneous results from the case being tipped on the vernier, the Precision Mic simply screws onto the case and is very accurate and easy to read. Cheers. :) [/QUOTE]
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Rifles, Reloading, Optics, Equipment
Reloading
Headspace 10-round sample
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