Load Specifications
Load data in caliber 6 x 70 R with .243 | 85gr | Lehigh Defense Controlled Chaos bullet and 12 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are ReloadSwiss RS 14 and Hodgdon TrailBoss.
Important Notice: DO NOT go below Minimum Charge or above Maximum Charge. Since we have no control over the equipment and components used, any responsibility and liability for the results achieved is rejected.
Only powders/loads that match the current filter criteria are displayed: max pressure of a load ≤ 90% of max. standardized pressure, fill rate ≥ 80% and propellant combustion ≥ 95%. Use the sliders above the tables to adjust these thresholds.
Charge: Powder weight in grains. Start with the minimum load and work up carefully.
FR (Fill Rate): Case fill as a percentage. Values above 100% mean compressed loads.
MaxP / %: Maximum chamber pressure in bar and as a percentage of the standardized maximum for this caliber.
V(0): Muzzle velocity in feet per second (fps) at the standardized barrel length.
z (Powder Burn): Estimated propellant combustion percentage at bullet exit.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 86% | 33,997 psi | 90% | 2595 fps | 99.6% |
| Accurate 4064 | <<locked>> | 86% | 32,082 psi | 85% | 2569 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,663 psi | 89% | 1785 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 33,257 psi | 88% | 2618 fps | 98.8% |
| Lovex D073.6 | <<locked>> | 82% | 32,227 psi | 85% | 2559 fps | 96% |
| Norma 202 | <<locked>> | 82% | 33,663 psi | 89% | 2569 fps | 97.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,765 psi | 90% | 1824 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,227 psi | 85% | 2559 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 32,895 psi | 87% | 2484 fps | 98% |
| Vihtavuori N135 | <<locked>> | 84% | 32,808 psi | 87% | 2559 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 84% | 34,084 psi | 90% | 2559 fps | 97.7% |
| Vihtavuori N540 | <<locked>> | 84% | 32,924 psi | 87% | 2543 fps | 96.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 80% | 27,920 psi | 74% | 2448 fps | 98.3% |
| Accurate 4064 | <<locked>> | 82% | 28,224 psi | 75% | 2464 fps | 95.8% |
| Hodgdon TrailBoss | 8.5 gr | 80% | 24,976 psi | 66% | 1598 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 31,183 psi | 83% | 2566 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 80% | 30,197 psi | 80% | 2507 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 31,604 psi | 84% | 2516 fps | 96.5% |
| ReloadSwiss RS 14 | 8.6 gr | 80% | 24,787 psi | 66% | 1631 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,197 psi | 80% | 2507 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,456 psi | 73% | 2346 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 28,747 psi | 76% | 2461 fps | 98.4% |
| Vihtavuori N140 | <<locked>> | 80% | 30,066 psi | 80% | 2457 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 80% | 28,819 psi | 76% | 2438 fps | 95.2% |
Recommended = one of the top powders for this cartridge and bullet combination.
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 12 powders for 6 x 70 R loaded with the .243 | 85gr | Lehigh Defense Controlled Chaos. IMR 3031 delivers the highest muzzle velocity at 2,618 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,618 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 reach 100 % fill or more at maximum charge, so these are compressed loads: they need a long drop tube to seat cleanly and react sensitively to the case capacity of your own brass lot. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 85gr | Lehigh Defense Controlled Chaos they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.