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Rifles, Reloading, Optics, Equipment
Reloading
When to trim
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<blockquote data-quote="jmden" data-source="post: 176498" data-attributes="member: 1742"><p>Hi Jim,</p><p></p><p>I'm not sure what you mean by 'minimum chamber length'. Is this a SAAMI spec number? Do you mean SAAMI max case length? </p><p></p><p>Have you measured your actual chamber length? Sinclair Int'l makes a cheap and easy to use gadget to do this at: <a href="http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTCL&type=store" target="_blank">Welcome to Sinclair International's Online Store</a></p><p></p><p>Sinclair's book talks about actually measuring your chamber length using the above tool and then using that as a gauge to determine your trim length--a length particular to your chamber instead of a number in a book that may be causing you to trim much more than needed. If I recall correctly, they did some studies and looked at various publications and arrived at a number of .021 less than your chamber length as a max case length. In general, I believe they were talking about BR rounds. Knowing this you can adjust your trim length to fit your needs. I've been using this number with a 300RUM for several years and it's allowed me to keep a bit longer neck than I would've otherwise and not trim quite as often Good luck.</p></blockquote><p></p>
[QUOTE="jmden, post: 176498, member: 1742"] Hi Jim, I'm not sure what you mean by 'minimum chamber length'. Is this a SAAMI spec number? Do you mean SAAMI max case length? Have you measured your actual chamber length? Sinclair Int'l makes a cheap and easy to use gadget to do this at: [url=http://www.sinclairintl.com/cgi-bin/category.cgi?category=RESDTCL&type=store]Welcome to Sinclair International's Online Store[/url] Sinclair's book talks about actually measuring your chamber length using the above tool and then using that as a gauge to determine your trim length--a length particular to your chamber instead of a number in a book that may be causing you to trim much more than needed. If I recall correctly, they did some studies and looked at various publications and arrived at a number of .021 less than your chamber length as a max case length. In general, I believe they were talking about BR rounds. Knowing this you can adjust your trim length to fit your needs. I've been using this number with a 300RUM for several years and it's allowed me to keep a bit longer neck than I would've otherwise and not trim quite as often Good luck. [/QUOTE]
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Rifles, Reloading, Optics, Equipment
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When to trim
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