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Category: Reloading » Measuring Tools
.308 Winchester Precision Micrometer
.308 Winchester Precision Micrometer
Our Low Price: $49.13

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Brand: RCBS 88329
Item: 64578
UPC: 076683883292

Precision Micrometer, .308 Winchester

.308 Winchester Precision Micrometer -
A few twists of the Precision Micrometer and you'll know your chamber headspace and bullet seating depth to 0.001 of an inch. Precision Micrometer measures from the datum point on the case's shoulder to the base, giving you spot on ANSI/SAAMI tolerance readings. This is an indispensable tool for safe, accurate loads that extend the life of your brass and your rifle.

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Customer Reviews

Most Helpful Customer Reviews

0 of 0 people found the following review helpful
4.0 Rating Great tool with draw backs - 4/29/2014
Reviewer: homeskillet
As a head space gauge this tool gets 5/5. As a bullet comparator this tool gets 5/5. As a bullet seating depth gauge (to find the lands) this tool gets close to 0/5. You can quickly measure head space on fired cases and then measure after your full length size to adjust by 0.002" to maximize brass life (big plus). You can compare bullets from different manufactures and see the difference in relative bullet jump which immediately tells me what ammo will shoot well or poorly for my rifle (nice bonus). However, determining bullet seating depth is a giant pain in the your rear end. The tool relies on friction to push the bushing (at the rear) forward after the bullet nose hits the lands (rifling), however, you are relying on the same friction to keep the same bushing from pulling backwards (messing up the measurement) as the extractor tries to removed the jammed bullet from the chamber. It will either rip the bushing off (leaving the rest of the tool jammed in the chamber), or will pull the bushing back some giving you very inconsistent measurements. The ONLY way to use this tool (besides putting it in the trash) is to use the gauge to precisely set a bullet seating depth that is short of the lands, then work your way up every 0.005" until you hit the lands (and probably pull the bushing off the tool as mentioned earlier). Then try to find the sweet spot by adjusting the tool by the 0.001" (before chambering) until the action cycles smoothly without messing up the measurement at the maximum value you can consistently get to work. Then you finally have your bullet seating depth that hits the lands within 0.001-2". It will take you a solid hour or more the first time you do this to get a good measurement and lots of cursing when the tool jams in the camber. But it will eventually work. I've done this method with 223, 308 and 300 Win Mag micrometers from RCBS. Oh, and you'll have to manually seat the gauge into the extractor (and depress the ejector) each time you try to use the gauge to ensure you get a good measurement. I'm buying a Hornady OAL gauge to verify my work with the RCBS gauge.
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.308 Winchester Precision Micrometer
.308 Winchester Precision Micrometer
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