The RCBS Precision Micrometer for 6mm GT (brand part no. 88335) gives handloaders a fast, repeatable way to check chamber headspace and bullet seating depth without guesswork. RCBS designed the Precision Mic to reference the datum point on the case shoulder rather than the case mouth, so the readings you get line up with SAAMI tolerance specifications instead of an inconsistent reference point. For 6mm GT shooters chasing tight, safe handloads and longer brass life, this tool takes the uncertainty out of the process with just a few twists.

Key Specifications

• Measures chamber headspace and bullet seating depth to 0.001 inch.
• References the datum point on the case shoulder for SAAMI-accurate readings.
• Built specifically for the 6mm GT cartridge.
• Helps extend rifle brass life by supporting safe, consistent loads.

Frequently Asked Questions

What does the Precision Mic measure? Chamber headspace and bullet seating depth, both to within 0.001 inch.

Why measure from the shoulder datum instead of the case mouth? It gives readings that match SAAMI tolerance specifications, which a case-mouth measurement cannot provide.

Buy the RCBS Precision Micrometer, 6mm GT

For 6mm GT handloaders who want SAAMI-accurate headspace and seating depth data every time, the RCBS Precision Mic earns its place on the bench. Order it from RCBS‘s reloading accessories lineup and our Lubbock, Texas team can help with fit questions.