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Rifles, Reloading, Optics, Equipment
Reloading
Unexpected Results using RCBS Precision Mic
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<blockquote data-quote="RD57" data-source="post: 2048612" data-attributes="member: 103010"><p>I use the Precision Mics all the time, and what you're experiencing is not unusual. The Mic is great for a reference but is not to be used/can't be use as a measuring tool like a ruler. I have a Sako 75 .223 Rem that the Prec Mic indicates a -.006 for fire formed cases (2 - 5 times fired). The chamber is within SAAMI spec. When I full length size my brass with a carefully honed down #10 shell holder it is -.005 and I don't feel any resistance with the bolt closing at all. Factory unfired .223 ammo I've used usually indicates about -.003 headspace with the Mic. Using the same Prec Mic my VTAC II 5.56 chamber indicates +.002 headspace after firing the same LC brass several times. As mentioned before don't crank down on it, do clean the bottom where the brass head sits and do keep your brass clean. I've seen errors also from extractors raising the area of the brass head creating a un-square head.</p></blockquote><p></p>
[QUOTE="RD57, post: 2048612, member: 103010"] I use the Precision Mics all the time, and what you're experiencing is not unusual. The Mic is great for a reference but is not to be used/can't be use as a measuring tool like a ruler. I have a Sako 75 .223 Rem that the Prec Mic indicates a -.006 for fire formed cases (2 - 5 times fired). The chamber is within SAAMI spec. When I full length size my brass with a carefully honed down #10 shell holder it is -.005 and I don't feel any resistance with the bolt closing at all. Factory unfired .223 ammo I've used usually indicates about -.003 headspace with the Mic. Using the same Prec Mic my VTAC II 5.56 chamber indicates +.002 headspace after firing the same LC brass several times. As mentioned before don't crank down on it, do clean the bottom where the brass head sits and do keep your brass clean. I've seen errors also from extractors raising the area of the brass head creating a un-square head. [/QUOTE]
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Reloading
Unexpected Results using RCBS Precision Mic
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