• RCBS .308 Winchester Precision Mic reloading gauge in black metal with brass-colored tip and graduated adjustment sleeves
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RCBS

RCBS .308 Winchester Precision Mic

RCBS .308 Winchester Precision Mic

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The RCBS .308 Winchester Precision Mic is a reloading instrument for measuring chamber headspace and bullet seating depth to 0.001-inch accuracy. It reads from the datum point on the case shoulder to the base, giving spot-on SAAMI tolerance readings.

Operation takes only a few twists, and the precise measurements help extend rifle brass life for safe, consistent loads.

Key Features

Brand RCBS
Product Type Precision Mic
Caliber .308 Winchester
Measurement Accuracy 0.001 inch
Measurement Type Chamber headspace and bullet seating depth
Datum Point Case shoulder to base
Tolerance Standard SAAMI
Operation Quick and easy with a few twists
Manufacturer SKU RCBS-88329
UPC 076683883292
Condition New

Highlights

  • Measures chamber headspace and bullet seating depth to 0.001-inch accuracy
  • Datum point measurement for SAAMI tolerance readings
  • Quick and easy operation with just a few twists
  • Helps extend rifle brass life

How to use

Insert a fired case into the Precision Mic and turn the thimble a few twists to read the datum point measurement. Use the same method to check bullet seating depth.

Frequently asked questions

What does the RCBS .308 Winchester Precision Mic measure?

It measures chamber headspace and bullet seating depth from the datum point on the case shoulder to the base.

What is the measurement accuracy of this tool?

It provides readings to 0.001-inch accuracy.

Does it deliver SAAMI tolerance readings?

Yes, it is designed to deliver spot-on SAAMI tolerance readings.

How is the tool operated?

It operates quickly and easily with just a few twists.

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Frequently Asked Questions

What measurements can I take with the RCBS .308 Winchester Precision Mic?
It measures chamber headspace and bullet seating depth. Headspace is read from the case shoulder datum point to the base.
How precise are the readings?
The readings are accurate to 0.001 inch.
Does it provide SAAMI tolerance readings?
Yes. It is designed to provide SAAMI tolerance readings.
How do I use the Precision Mic?
Insert a fired case and turn the thimble a few twists to read the datum point measurement. Use the same method to check bullet seating depth.
What can the measurements help with?
The precise measurements can help extend rifle brass life and support safe, consistent loads.