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Rifles, Reloading, Optics, Equipment
Rifles, Bullets, Barrels & Ballistics
Case stretch
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<blockquote data-quote="SBruce" data-source="post: 413902" data-attributes="member: 21068"><p>I would think that .005" is very normal for a once fired case. I've seen that much expansion/stretch in alot of factory guns. </p><p> </p><p>I am getting some custom dies built for a new wildcat. The die maker requires cases that have been fired 3 times to make the perfect die. This tells me that new, unfired cases are usually alot smaller than a chamber is. I believe the allowed varience in factory chambers (SAAMI specs) is .010" between go and no go. Therefore, new brass would have to be small enough to chamber in the SAAMI Minimum chambers.</p><p> </p><p>I highly suggest an RCBS Precision Mic. It is a multiple use tool that will measure your headspace (off of a fired case), aid in setting up your FL die so it just barely bumps the shoulder, it will measure the Boltface to Lands in your gun, and also provide you with a tool to measure the cartidge Base to Ogive of a loaded round (so you can adjust the seating die for maximum accuracy)</p><p> </p><p>I've been using them for many years in factory chambered guns. For the simple fact that some factory chambers <strong>are</strong> on the excessive side.</p></blockquote><p></p>
[QUOTE="SBruce, post: 413902, member: 21068"] I would think that .005" is very normal for a once fired case. I've seen that much expansion/stretch in alot of factory guns. I am getting some custom dies built for a new wildcat. The die maker requires cases that have been fired 3 times to make the perfect die. This tells me that new, unfired cases are usually alot smaller than a chamber is. I believe the allowed varience in factory chambers (SAAMI specs) is .010" between go and no go. Therefore, new brass would have to be small enough to chamber in the SAAMI Minimum chambers. I highly suggest an RCBS Precision Mic. It is a multiple use tool that will measure your headspace (off of a fired case), aid in setting up your FL die so it just barely bumps the shoulder, it will measure the Boltface to Lands in your gun, and also provide you with a tool to measure the cartidge Base to Ogive of a loaded round (so you can adjust the seating die for maximum accuracy) I've been using them for many years in factory chambered guns. For the simple fact that some factory chambers [B]are[/B] on the excessive side. [/QUOTE]
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Case stretch
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