Frequently Asked Questions
1. What does the Case Gage Depth Micrometer measure?
This tool measures how far your full-length sizing die is pushing back the case shoulder. By comparing the case position in the gage before and after sizing, you can determine headspace movement to within .001". This allows you to size brass only as much as needed for proper chambering and maximum case life.
2. Do I need a Wilson Case Gage to use this micrometer?
Yes. The Depth Micrometer is designed to slip over the top of a Wilson Cartridge Case Gage. The gage is not included with the micrometer, but one size of micrometer works universally with all Wilson Case Gages.
3. Why must the primer be removed before taking a measurement?
Primers can affect the reading by changing the case head height. Always de-cap the case before measuring, then measure the same case again after sizing so you can accurately compare shoulder movement.
4. Why am I getting inconsistent readings?
Variations can occur for a few common reasons:
Case heads may have stamped markings that create slight height differences.
Cases from the same lot may still size differently.
Cases may be slightly eccentric.
Taking several readings or checking multiple cases helps ensure you are seeing true measurements.
5. What does a reading above or below .100” indicate?
The micrometer is zeroed at .100”, which represents “flush” with the gage or maximum headspace on the gage.
6. How do I know how much shoulder setback I created?
Subtract the full-length sized reading from the as-fired reading.
Example:
7. How do I adjust my sizing die if the reading is not what I want?
Loosen the die lock ring and un-thread the die slightly in the counter-clockwise direction to reduce shoulder setback. Size the same case again and repeat measurements until you reach the desired dimension.
8. When should I re-zero the micrometer?
Re-zeroing might be needed if:
Your measuring “feel” differs from the assembler at the factory.
Temperature changes affect the steel gage block.
Use the included gage block to reset the micrometer to a zero reading of .100”, then fine-tune the scale sleeve as needed.
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