Description
The 6XC was David Tubb's answer to a High Power and long-range problem: how to push high-BC 6mm bullets fast, with mild recoil and sane barrel life. Peterson Cartridge builds brass that lives up to that pedigree, drawing every case in the USA to match-grade tolerances. This is the small rifle primer (SRP) version, a setup a lot of precision reloaders prefer for the tighter ignition and the reputation small primer pockets have for holding up over more firings.
What Sets This Peterson 6XC SRP Brass Apart
Consistency is the whole point here. Peterson holds tight control over case weight, wall thickness, and overall length, so your powder charges, neck tension, and velocities stay repeatable from one case to the next. That translates to lower extreme spreads and less vertical stringing when you stretch things out to 600 and 1,000 yards. The 30-degree shoulder on the 6XC also helps retard case growth, which means less trimming and easier case prep between loadings.
Reloading Notes for the SRP Version
This is the detail that trips people up, so pay attention: Peterson's SRP cases use a smaller 0.060" flash hole compared to the 0.080" flash hole on their large rifle primer brass. You'll want an X-small or undersized decapping pin to deprime these without bending a standard pin. On primer choice, popular picks for 6XC SRP include the Remington 7-1/2 and CCI 450, with Tubb himself leaning toward the Remington. As always, work up your loads from published data.
Who Runs Peterson 6XC Brass
This is a favorite among across-the-course, prone, and PRS competitors who want a cartridge that feeds well, tunes easily, and forgives the occasional off shot. The 6XC runs high-BC bullets like the 105 to 115 grain 6mm projectiles efficiently, and the case geometry keeps those long bullets clear of the dreaded neck donut. If you're feeding a 6XC chamber and you want brass you don't have to sort and cull to death, this is a strong foundation to build on.
Key Specifications
- Caliber: 6XC (6mm XC)
- Primer Size: Small Rifle Primer (SRP)
- Condition: Unprimed
- Flash Hole Diameter: 0.060"
- Case Material: Brass
- Quantity: 50 Count
- Grade: Match-Grade
- Country of Origin: Made in USA
- Manufacturer: Peterson Cartridge
- Manufacturer Part Number: 40042-R
- UPC: 810068271133
What’s Included
- 50 count Peterson Cartridge 6XC SRP unprimed brass casings
- Reusable plastic ammo box
Frequently Asked Questions
What decapping pin do I need for Peterson 6XC SRP brass?
These SRP cases use a smaller 0.060" flash hole instead of the 0.080" flash hole found on Peterson's large rifle primer brass. Because of that, you'll want an X-small or undersized decapping pin to deprime them. Running a standard-size pin risks bending or breaking it in that smaller hole.
Which primers work best in the 6XC SRP brass?
Popular choices among 6XC SRP shooters include the Remington 7-1/2 and the CCI 450, and David Tubb himself tends to favor the Remington. Some reloaders have also had good results with match-grade options like the CCI BR4. Always start low and work your loads up from published data for your rifle.
Why choose small rifle primer brass over large rifle primer for the 6XC?
A lot of precision reloaders go small rifle primer for the tighter, more consistent ignition it can offer, which often shows up as lower extreme spreads. Small primer pockets also tend to hold up over more firings, stretching case life. For target work at distance, those small gains add up on the scorecard.
Is this brass loaded ammunition or does it come primed?
This is unprimed brass only, not loaded ammunition and not primed. You supply your own primers, powder, and bullets to build your handloads. The cases ship in a reusable plastic ammo box to keep things organized at the loading bench.




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