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Rifles, Reloading, Optics, Equipment
Reloading
Unexpected Results using RCBS Precision Mic
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<blockquote data-quote="DrSteve" data-source="post: 2048807" data-attributes="member: 114341"><p>I'm very grateful for all the thoughtful comments. I got out my Hornady Comparator and using a light touch on the RCBS Precision Mic, I ran the numbers again, and the results were much more consistent. On my reloads (I only have three unfired ones left so the sample size is small). The Hornady comparator said the datum length went from 1.621 unfired to 1.623 fired. The RCBS Mic said the length went from -.002 to -.003, which is counter-intuitive, but may be measurement error. On the Hornady American Whitetail factory loads (I measured about 10 of these all from the same lot, and the readings were consistent) the Hornady Comparator said the datum length stayed the same at 1.623. The RCBS Mic said the length went from -.002 to -.001", so that's going in the right direction, I guess. The directions said to add the fired measurement to the SAAMI minimum (1.630") to get the chamber headspace. In this case, my chamber is apparently .001" smaller than SAAMI minimum. I've ordered a Forster Go Gauge to see if it will chamber. If the Go Gauge won't go, should I send the rifle back to Ruger or just work around it? Thanks everybody.</p></blockquote><p></p>
[QUOTE="DrSteve, post: 2048807, member: 114341"] I'm very grateful for all the thoughtful comments. I got out my Hornady Comparator and using a light touch on the RCBS Precision Mic, I ran the numbers again, and the results were much more consistent. On my reloads (I only have three unfired ones left so the sample size is small). The Hornady comparator said the datum length went from 1.621 unfired to 1.623 fired. The RCBS Mic said the length went from -.002 to -.003, which is counter-intuitive, but may be measurement error. On the Hornady American Whitetail factory loads (I measured about 10 of these all from the same lot, and the readings were consistent) the Hornady Comparator said the datum length stayed the same at 1.623. The RCBS Mic said the length went from -.002 to -.001", so that's going in the right direction, I guess. The directions said to add the fired measurement to the SAAMI minimum (1.630") to get the chamber headspace. In this case, my chamber is apparently .001" smaller than SAAMI minimum. I've ordered a Forster Go Gauge to see if it will chamber. If the Go Gauge won't go, should I send the rifle back to Ruger or just work around it? Thanks everybody. [/QUOTE]
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Unexpected Results using RCBS Precision Mic
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