Lindcott Armory Rifle · Wildcat
6mm Dasher
Wildcat improvement of 6mm BR Norma with a sharper 40-degree shoulder, optimized for F-Class and precision bolt-gun competition.
- Caliber
- 0.2429″ · 6.17 mm
- Introduced
- 1999
- Case
- Rimless
- Parent
- 6mm BR Norma
- Primary use
- Competition, Target
- Status
- Active
- Introduced
- 1999
- Type
- Rifle
- Origin
- United States
- Inventor
- Dan Dowling / Lou Murdica
- Manufacturer
- Custom / Various
- Standard
- Wildcat
- Status
- Active
- Availability
- Limited
- Case capacity
- 38 gr H₂O
- Twist (typical)
- 1:7.5
- Primer
- Small Rifle
- Case type
- Rimless
- Max pressure
- 58,000 psi
- Eff. range
- 1000 yd
- Max range
- 3000 yd
- Recoil
- 5–8 ft·lb
Ballistics
Real trajectory computed from a representative load — Hornady ELD Match 108 gr, 2,950 fps, BC 0.276 G7 · 100 yd zero.
| Range | Velocity | Energy | Drop (in) | Drop (MOA) |
|---|---|---|---|---|
| 0 yd | 2949 | 2085 | -1.5″ | — |
| 100 yd | 2781 | 1854 | 0.0″ | 0.0 |
| 200 yd | 2618 | 1643 | -3.0″ | -1.4 |
| 300 yd | 2458 | 1449 | -11.1″ | -3.5 |
| 400 yd | 2305 | 1274 | -25.0″ | -6.0 |
| 500 yd | 2157 | 1116 | -45.4″ | -8.7 |
| 600 yd | 2014 | 972 | -73.3″ | -11.7 |
| 700 yd | 1875 | 843 | -109.8″ | -15.0 |
| 800 yd | 1741 | 727 | -156.2″ | -18.6 |
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 6mm Dasher 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 ⌀ | 6.90 | 0.272 | ✓ |
| Shoulder ⌀ | 11.65 | 0.459 | ✓ |
| Shoulder angle | 40° | — | ✓ |
| Base ⌀ | 11.96 | 0.471 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 6.04 | 0.238 | ≈ |
| Case length | 39.24 | 1.545 | ✓ |
| Overall length | 60.00 | 2.362 | ✓ |
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. 6mm Dasher is highlighted below.
Factory loads
In production — 23 active loads across 22 brands. Top 15 shown · see all 23 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Prime Ammunition | OTM Match | 105 | OTM | 2,950 | 2,029 | 0.272 G7 |
| Alpha Munitions | OTM Match | 105 | OTM | 2,950 | 2,029 | 0.272 G7 |
| Peterson Cartridge | OTM Match | 105 | OTM | 2,950 | 2,029 | 0.272 G7 |
| Hornady | ELD Match | 108 | ELD-M | 2,950 | 2,087 | 0.276 G7 |
| Berger | OTM Hybrid Target | 105 | Hybrid OTM | 2,950 | 2,029 | 0.272 G7 |
| ADG | Match | 105 | OTM | 3,050 | 2,168 | — |
| Copper Creek | Match | 105 | Hybrid OTM | 3,050 | 2,168 | — |
| Black Hills | Gold | 105 | OTM | 3,050 | 2,168 | — |
| Norma | Match | 105 | BTHP | 3,050 | 2,168 | — |
| Lapua | Match | 105 | Scenar-L | 3,050 | 2,168 | — |
| Ruag | Swiss P | 105 | HPBT | 3,025 | 2,133 | — |
| Rifle Only | Match | 105 | OTM | 3,025 | 2,133 | — |
| Federal | Gold Medal | 105 | Sierra MatchKing | 3,025 | 2,133 | — |
| SIG Sauer | Elite | 107 | BTHP | 3,020 | 2,167 | — |
| Ammo Inc. | Signature | 105 | BTHP | 3,000 | 2,098 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
Suitable powders
2 reloading powders listed for 6mm Dasher, 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.
Firearms chambered in 6mm Dasher
2 models in the database chamber 6mm Dasher. Browse all →
Lineage
Connected reference
History
Created around 1999 by F-Class competitors Dan Dowling and Lou Murdica by fire-forming 6mm BR Norma brass to a sharper shoulder angle. The improved case geometry reduces powder column movement and slightly increases capacity, resulting in more consistent velocities and tighter standard deviations — the holy grail for long-range competition. It dominated F-Open and F-TR competition for years and remains one of the most inherently accurate cartridges ever developed. Never submitted to SAAMI due to the handloading culture of its user base; factory ammunition is available from a handful of small manufacturers.
FAQs
- What twist rate does 6mm Dasher use?
- 6mm Dasher typically uses a 1:7.5 twist rate.
- What bullet diameter is 6mm Dasher?
- 6mm Dasher uses a 0.2429″ (6.17 mm) diameter bullet.
- Is 6mm Dasher still in production?
- 6mm Dasher is active; typical availability is limited.
- What is 6mm Dasher used for?
- 6mm Dasher is primarily used for competition, target.
- What is 6mm Dasher based on?
- 6mm Dasher is derived from the 6mm BR Norma case.
- What are the best powders for 6mm Dasher?
- Reloading powders commonly listed for 6mm Dasher include N135, LT-32.
Sources & provenance
Data & sources. Specs compiled from the Lindcott Armory reference; availability counted from 23 live factory loads; the trajectory is modeled (point-mass), not measured. See methodology. Spotted an error? Report it →