Lindcott Armory Rifle · Wildcat
6mm-284
Legendary benchrest and long-range competition wildcat.
- Caliber
- 0.243″ · 6.172 mm
- Introduced
- 1960
- Case
- Rebated
- Parent
- .284 Winchester
- Primary use
- Competition, Target
- Status
- Limited
- Introduced
- 1960
- Type
- Rifle
- Origin
- United States
- Inventor
- Benchrest shooters
- Manufacturer
- Various wildcatters
- Standard
- Wildcat
- Status
- Limited
- Availability
- Scarce
- Case capacity
- 71 gr H₂O
- Twist (typical)
- 1:8 to 1:10
- Primer
- Large Rifle
- Case type
- Rebated
- Max pressure
- 62,000 psi
- Eff. range
- 1000 yd
- Max range
- 4200 yd
- Recoil
- 5–8 ft·lb
Ballistics
Real trajectory computed from a representative load — Hornady ELD-M 108gr 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 6mm-284 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.
SAAMI · verified| Measure | mm | in | ✓ |
|---|---|---|---|
| Bullet ⌀ | 6.17 | 0.243 | ✓ |
| Neck ⌀ | 7.01 | 0.276 | ✓ |
| Shoulder ⌀ | 12.06 | 0.475 | ✓ |
| Shoulder angle | 35° | — | ✓ |
| Base ⌀ | 12.70 | 0.500 | ✓ |
| Rim ⌀ | 12.01 | 0.473 | ✓ |
| Belt ⌀ | n/a | ||
| Rim thickness | 1.37 | 0.054 | ✓ |
| Neck length | 7.24 | 0.285 | ≈ |
| Case length | 55.12 | 2.170 | ✓ |
| Overall length | 71.12 | 2.800 | ✓ |
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-284 is highlighted below.
Factory loads
In production — 20 active loads across 15 brands. Top 15 shown · see all 20 →.
| Brand | Load | Grain | Bullet | FPS | ft·lb | BC |
|---|---|---|---|---|---|---|
| Berger | OTM Hybrid Target | 105 | Hybrid OTM | 3,200 | 2,387 | 0.272 G7 |
| Norma | OTM Match | 105 | OTM | 3,200 | 2,387 | 0.272 G7 |
| Hornady | ELD Match | 108 | ELD-M | 3,150 | 2,379 | 0.276 G7 |
| Hornady | ELD-M 108gr | 108 | ELD-M | 3,000 | 2,158 | 0.276 G7 |
| Lapua | Scenar-L OTM | 105 | Scenar-L | 3,200 | 2,387 | — |
| RUAG Ammotec | Swiss P HPBT 115gr | 115 | HPBT | 3,000 | 2,298 | — |
| Norma | Classic | 105 | Hollow Point Boat Tail | 3,000 | 2,098 | — |
| Lapua | Scenar-L 115gr OTM | 115 | Scenar-L | 3,000 | 2,298 | — |
| Federal | Gold Medal Match 115gr HP | 115 | HP | 3,000 | 2,298 | — |
| Black Hills | Gold OTM 115gr | 115 | OTM | 3,000 | 2,298 | — |
| Armscor | Standard | 105 | Hollow Point Boat Tail | 3,000 | 2,098 | — |
| Kynoch | Classic | 105 | Hollow Point Boat Tail | 3,000 | 2,098 | — |
| Berger | Hybrid OTM 115gr | 115 | Hybrid OTM | 3,000 | 2,298 | — |
| Norma | Match HPBT 115gr | 115 | HPBT | 3,000 | 2,298 | — |
| Buffalo Arms | Custom | 105 | Hollow Point Boat Tail | 3,000 | 2,098 | — |
Velocities are manufacturer-stated (test-barrel). Discontinued loads dimmed.
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 in 1960s by benchrest shooters seeking extreme accuracy. Necking .284 Winchester to 6mm created high-velocity, high-capacity case in short action. Dominated long-range competition for 30+ years. Never commercialized but remained popular wildcat. Inspired development of 6.5-284 Norma. The 6mm Creedmoor is essentially a commercial version of this concept. Still used by some long-range competitors.
FAQs
- What twist rate does 6mm-284 use?
- 6mm-284 typically uses a 1:8 to 1:10 twist rate.
- What bullet diameter is 6mm-284?
- 6mm-284 uses a 0.243″ (6.172 mm) diameter bullet.
- Is 6mm-284 still in production?
- 6mm-284 is limited; typical availability is scarce.
- What is 6mm-284 used for?
- 6mm-284 is primarily used for competition, target.
- What is 6mm-284 based on?
- 6mm-284 is derived from the .284 Winchester case.
Sources & provenance
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 →