Lindcott Armory Rifle · Wildcat
6XC
David Tubb's competition wildcat: a mid-size 6mm case optimized for long-range F-Open competition, offering more powder capacity than 6mm BR while staying shorter than 6-284..
- Caliber
- 0.2429″ · 6.17 mm
- Introduced
- 2005
- Case
- Rebated
- Parent
- .250 Savage
- Primary use
- Competition, Target
- Status
- Active
- Introduced
- 2005
- Type
- Rifle
- Origin
- United States
- Inventor
- David Tubb
- Manufacturer
- Superior Shooting Systems
- Standard
- Wildcat
- Status
- Active
- Availability
- Limited
- Case capacity
- 62 gr H₂O
- Twist (typical)
- 1:8
- Primer
- Large Rifle
- Case type
- Rebated
- Max pressure
- 62,000 psi
- Eff. range
- 1000 yd
- Max range
- 2500 yd
- Recoil
- 5–8 ft·lb
Ballistics
Real trajectory computed from a representative load — Hornady ELD Match 108 gr, 3,000 fps, BC 0.276 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2999 | 2157 | -1.5″ | — |
| 100 yd | 2830 | 1920 | -0.1″ | -0.1 |
| 200 yd | 2664 | 1702 | -3.0″ | -1.5 |
| 300 yd | 2504 | 1504 | -10.9″ | -3.5 |
| 400 yd | 2349 | 1323 | -24.3″ | -5.8 |
| 500 yd | 2199 | 1160 | -44.0″ | -8.4 |
| 600 yd | 2055 | 1013 | -70.9″ | -11.3 |
| 700 yd | 1915 | 880 | -106.0″ | -14.5 |
| 800 yd | 1780 | 759 | -150.7″ | -18.0 |
Point-mass G7/G1 drag model, standard atmosphere — within ~2% of reference solvers to 1000 yd; real barrels and conditions vary. Open in Ballistic Compare →
Performance
Buy links open 6XC ammunition at Rivertown Munitions.
Dimensionscase measurements · scale drawing · size vs familiar rounds
Case dimensions — the scale drawing at the top of the page is built from these.
CIP TDCC · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.17 | 0.243 | ✓ |
| Neck ⌀ | 6.82 | 0.269 | ✓ |
| Shoulder ⌀ | 11.42 | 0.450 | ✓ |
| Shoulder angle | 30° | — | ✓ |
| Base ⌀ | 11.84 | 0.466 | ✓ |
| Rim ⌀ | 11.86 | 0.467 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.22 | 0.048 | ✓ |
| Neck length | 7.49 | 0.295 | ≈ |
| Case length | 48.10 | 1.894 | ✓ |
| Overall length | 63.40 | 2.496 | ✓ |
Size vs familiar rounds
Drawn at true 1:1 — every case is accurate relative to the others. Absolute size depends on your screen's pixel density, so measuring one against a real ruler may be off. 6XC is highlighted below.
Factory loads
In production — 20 active loads across 16 brands. Top 15 shown · see all 20 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Hornady | ELD Match | 108 | ELD-M | 3,000 | 2,158 | 0.276 G7 |
| Norma | OTM Match | 105 | OTM | 3,000 | 2,098 | 0.272 G7 |
| Berger | OTM Hybrid Target | 105 | Hybrid OTM | 3,000 | 2,098 | 0.272 G7 |
| Hornady | ELD-M 115gr | 115 | ELD-M | 2,900 | 2,147 | 0.263 G7 |
| Nosler | Trophy Grade | 115 | AccuBond | 3,000 | 2,298 | — |
| Sellier & Bellot | SP | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Kynoch | Classic | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Armscor | Standard | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Norma | Classic | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Buffalo Arms | Custom | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| RWS | Classic | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| PPU | Standard | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Wolf | FMJ | 105 | Hollow Point Boat Tail | 2,950 | 2,029 | — |
| Black Hills | Gold OTM 115gr | 115 | OTM | 2,900 | 2,147 | — |
| RUAG Ammotec | Swiss P HPBT 115gr | 115 | HPBT | 2,900 | 2,147 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
2 reloading powders listed for 6XC, fastest to slowest. Cross-reference in the finder →
Reloading costestimate cost per round vs factory
Estimate your cost per round and how it compares to factory. Inputs are yours — nothing is stored.
Cost estimate only — not load data. Charge weight is your input; follow published manuals for safe charges.
Lineage
Connected reference
History
Developed around 2005 by David Tubb, 12-time National High Power champion. The 6XC was engineered specifically for F-Open and High Power competition, bridging the gap between the efficient but small 6mm BR and the larger but over-powered 6-284. Superior Shooting Systems (Tubb's company) produces custom brass. The cartridge won numerous national and world titles in F-Open competition throughout the late 2000s and 2010s. Never submitted to SAAMI — its handloading-focused user base preferred it stay a wildcat.
FAQs
- What twist rate does 6XC use?
- 6XC typically uses a 1:8 twist rate.
- What bullet diameter is 6XC?
- 6XC uses a 0.2429″ (6.17 mm) diameter bullet.
- Is 6XC still in production?
- 6XC is active; typical availability is limited.
- What is 6XC used for?
- 6XC is primarily used for competition, target.
- What is 6XC based on?
- 6XC is derived from the .284 Winchester case.
- What are the best powders for 6XC?
- Reloading powders commonly listed for 6XC include IMR 3031, LT-32.
Sources & provenance
- StandardSAAMI — SAAMI cartridge & chamber drawing — 6XCarchived
- StandardC.I.P. — C.I.P. TDCC — Tables of Dimensions of Cartridges and Chambers
- Secondary6 mm XC - Wikipedia · parent_cartridge
- Secondary6XC Cartridge Guide - AccurateShooter · parent_cartridge
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 20 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →