History
The 6.5-284 started as a benchrest and target wildcat in the 1960s, the .284 Winchester case necked down to 6.5mm. It spent decades as one of the most respected long-range chamberings in the game. Norma standardized it in 1999, putting a published specification and factory brass behind what target shooters had already proven at 1,000 yards.
For years it was the cartridge to beat in F-class and long-range prone. It drives a high-BC 6.5mm bullet fast, and it is famously accurate. The drawback is barrel life: it is overbore enough to wear throats faster than the 6.5 Creedmoor that has since taken much of its competitive role.
Lineage
From the .284 Winchester it inherits a distinctive rebated rim: the .473 inch rim is smaller than the .500 inch body, so the case feeds from a standard bolt face while holding more powder. Its closest relatives are that parent and the 6.5 Creedmoor, which chases the same high-BC 6.5mm target mission on a smaller, easier-on-barrels case.
Specifications
| Spec | Value |
|---|---|
| Case type | Rimless (rebated), bottlenecked |
| Bullet diameter | 6.71 mm (.264 in) |
| Neck diameter | 7.53 mm (.296 in) |
| Shoulder diameter | 12.01 mm (.473 in) |
| Base diameter | 12.70 mm (.500 in) |
| Rim diameter | 11.95 mm (.473 in, rebated) |
| Case length | 55.12 mm (2.170 in) |
| Overall length | 82.00 mm (3.228 in) |
| Case capacity | ~66 gr H2O (nominal; varies by brand) |
| Primer size | Large rifle |
| Belted | No |
| Rifling twist | 1 in 8 in (recommended) |
| Max pressure | 63,817 psi / 4,400 bar (C.I.P.) |
| Recommended barrel | 26 in, 1:8 twist |
Barrel Design
The mild overbore is the source of both the performance and the heavy barrel wear. A generous powder charge for a 6.5mm bore calls for a longer tube that lets the slow powders finish burning and turn that charge into velocity. Target shooters ran it in 28 to 30 inch barrels for that reason, and that is where it posts its best numbers.
Twist is settled. A 1:8 holds the heavy 140 to 142 grain match bullets that made the cartridge famous, with margin to stay stable into the transonic range. Running it slower gains nothing; light-bullet hunting is not the job.
The baseline I'd recommend is 26 inches, a practical length that still captures most of the velocity in a barrel that handles. Pure F-class or ELR is the case for 28 to 30 inches, the traditional and defensible choice, but plan on replacing it sooner than you would a Creedmoor's. A longer barrel also tightens standard deviation on the match loads. The tables below are computed at that 26 inch baseline.
Match Ammo Performance
HSM Trophy Gold · 130 gr Berger VLD $2.79/rd
| Range (yd) | Velocity (fps) | Elevation (mil) | Energy (ft-lb) | Windage (mil) |
|---|---|---|---|---|
| 0 | 2994 | -0.3 | 2587 | 0.3 |
| 100 | 2838 | 0.0 | 2324 | 0.2 |
| 200 | 2685 | -0.3 | 2081 | 0.3 |
| 300 | 2538 | -0.9 | 1859 | 0.5 |
| 400 | 2394 | -1.6 | 1655 | 0.7 |
| 500 | 2256 | -2.3 | 1469 | 0.9 |
| 600 | 2123 | -3.1 | 1301 | 1.1 |
| 700 | 1994 | -4.0 | 1147 | 1.3 |
| 800 | 1869 | -5.0 | 1008 | 1.5 |
| 900 | 1748 | -6.1 | 882 | 1.8 |
| 1000 | 1630 | -7.3 | 767 | 2.0 |
| 1100 | 1516 | -8.6 | 663 | 2.3 |
| 1200 | 1405 | -10.0 | 570 | 2.6 |
| 1300 | 1299 | -11.6 | 487 | 2.9 |
| 1400 | 1198 | -13.4 | 415 | 3.3 |
| 1500 | 1111 | -15.4 | 356 | 3.7 |
| 1600 | 1063 | -17.7 | 326 | 4.1 |
Muzzle velocity 2994 fps is estimated at 26 in from the 24 in factory figure of 2950 fps at about 22 fps per inch. Expect your own barrel to read a little differently. Velocity is color coded green supersonic, yellow transonic, red subsonic; treat transonic and subsonic rows as approximate.
Trajectory
FAQ
What barrel length and twist should I run?
A 1:8 twist for the heavy 140-grain class match bullets, and 26 inches as a practical baseline. Dedicated F-class and ELR shooters traditionally run 28 to 30 inches to wring out the last velocity, accepting shorter barrel life as part of the deal.
Why is it called a barrel burner?
It pushes a relatively large powder charge through a small 6.5mm bore at high pressure, which erodes the throat faster than a more efficient case like the 6.5 Creedmoor. Competitive shooters often see useful accuracy life measured in the low thousands of rounds.
How does it compare to the 6.5 Creedmoor?
The 6.5-284 holds more powder and runs 100 to 150 fps faster with the same bullet, which gave it the long-range edge for years. The 6.5 Creedmoor trades that small velocity gap for much longer barrel life, cheaper components, and short-action feeding, which is why it has taken over most of the 6.5-284's competition role.
What is the 6.5-284 Norma good for?
Long-range target and F-class shooting, and long-range hunting, where its velocity and high-BC bullets matter and barrel life is an accepted cost. It remains a genuinely excellent accuracy cartridge.