RCBS
RCBS 338 Lapua Magnum Precision Mic Headspace Seating Depth Tool
RCBS 338 Lapua Magnum Precision Mic Headspace Seating Depth Tool
The RCBS 338 Lapua Magnum Precision Mic is a reloading measuring tool built for the 338 Lapua Magnum cartridge, reading chamber headspace and bullet seating depth to 0.001 inch. It measures from the datum point on the case shoulder to the base, giving SAAMI tolerance readings for the ammunition being loaded.
Operation takes only a few twists, so a reloader can check shoulder position and seating depth between loading steps. Those readings support safe, accurate loads and help extend brass life by showing when cases have moved beyond tolerance.
Key Features
| Brand | RCBS |
| Product Type | Precision Micrometer |
| Caliber | 338 Lapua Mag |
| Measurement Range | Chamber headspace and bullet seating depth |
| Measurement Precision | 0.001 in |
| Measurement Reference | Datum point on case shoulder to base |
| Tolerance Standard | SAAMI |
| Operation | Adjustable micrometer thimble |
| Manufacturer SKU | RCBS-88332 |
| Condition | New |
Highlights
- 0.001 inch measurement precision
- Checks both chamber headspace and bullet seating depth
- SAAMI tolerance readings from the case shoulder datum to the base
- Built for the 338 Lapua Magnum cartridge
- Helps create safe, accurate loads and extend brass life
How to use
- Fit the case into the Precision Mic and adjust the micrometer with a few twists to take a reading.
- Measure from the datum point on the case shoulder to the base to check chamber headspace.
- Use the same tool to check bullet seating depth.
- Compare readings against SAAMI tolerances before loading.
Frequently asked questions
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