Load Specifications
Load data in caliber 6 x 70 R with .243 | 80gr | Osprey Virtus bullet and 14 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4064, 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% | 32,314 psi | 86% | 2654 fps | 99.1% |
| Accurate 4064 | <<locked>> | 88% | 32,503 psi | 86% | 2671 fps | 97.1% |
| Alliant AR-Comp | <<locked>> | 82% | 33,504 psi | 89% | 2703 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,040 psi | 88% | 1850 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 32,024 psi | 85% | 2680 fps | 98.2% |
| Lovex D073.6 | <<locked>> | 84% | 33,344 psi | 88% | 2677 fps | 96.1% |
| Norma 202 | <<locked>> | 82% | 32,401 psi | 86% | 2631 fps | 96.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,431 psi | 89% | 1900 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,344 psi | 88% | 2677 fps | 96.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 31,720 psi | 84% | 2546 fps | 97.3% |
| Somchem S335 | <<locked>> | 82% | 34,011 psi | 90% | 2605 fps | 97.8% |
| Vihtavuori N135 | <<locked>> | 86% | 33,272 psi | 88% | 2664 fps | 99.2% |
| Vihtavuori N140 | <<locked>> | 84% | 32,721 psi | 87% | 2615 fps | 97% |
| Vihtavuori N540 | <<locked>> | 86% | 33,794 psi | 90% | 2654 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% | 25,918 psi | 69% | 2480 fps | 97.2% |
| Accurate 4064 | 26.9 gr | 84% | 28,282 psi | 75% | 2559 fps | 95.4% |
| Alliant AR-Comp | <<locked>> | 80% | 31,386 psi | 83% | 2651 fps | 100% |
| Hodgdon TrailBoss | 8.8 gr | 80% | 24,323 psi | 65% | 1657 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 29,718 psi | 79% | 2618 fps | 97.4% |
| Lovex D073.6 | <<locked>> | 82% | 30,951 psi | 82% | 2618 fps | 95.1% |
| Norma 202 | <<locked>> | 80% | 30,443 psi | 81% | 2579 fps | 95.7% |
| ReloadSwiss RS 14 | 9 gr | 80% | 24,410 psi | 65% | 1699 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 30,951 psi | 82% | 2618 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,281 psi | 70% | 2395 fps | 95% |
| Somchem S335 | <<locked>> | 80% | 31,720 psi | 84% | 2546 fps | 97.1% |
| Vihtavuori N135 | <<locked>> | 80% | 27,325 psi | 72% | 2510 fps | 97.5% |
| Vihtavuori N140 | <<locked>> | 80% | 28,645 psi | 76% | 2507 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 82% | 29,631 psi | 79% | 2546 fps | 95.1% |
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 14 powders for 6 x 70 R loaded with the .243 | 80gr | Osprey Virtus. Alliant AR-Comp delivers the highest muzzle velocity at 2,703 fps; across all powders the maximum-charge window runs from 1,850 fps to 2,703 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 14 of the 14 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 80.0 gr projectile in 0.243" calls for a 1:9.5 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. Accurate 4064, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 80gr | Osprey Virtus 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.