Load Specifications
Load data in caliber 6 x 70 R with .243 | 100gr | Norma ORYX bullet and 9 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, 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 4064 | <<locked>> | 82% | 32,764 psi | 87% | 2395 fps | 98.9% |
| Bofors RP3 | <<locked>> | 84% | 33,779 psi | 90% | 2425 fps | 96.4% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,431 psi | 89% | 1634 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,692 psi | 89% | 1673 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,053 psi | 85% | 2441 fps | 97.2% |
| Rottweil R 903 | <<locked>> | 86% | 33,678 psi | 89% | 2415 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 32,967 psi | 87% | 2306 fps | 99.3% |
| Somchem S365 | <<locked>> | 94% | 32,445 psi | 86% | 2451 fps | 96.5% |
| Vihtavuori N150 | <<locked>> | 86% | 33,185 psi | 88% | 2369 fps | 97.1% |
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 4064 | <<locked>> | 80% | 30,748 psi | 82% | 2346 fps | 98.4% |
| Bofors RP3 | <<locked>> | 82% | 31,633 psi | 84% | 2375 fps | 95.6% |
| Hodgdon TrailBoss | 8.4 gr | 80% | 25,454 psi | 68% | 1476 fps | 100% |
| ReloadSwiss RS 14 | 8.6 gr | 80% | 25,788 psi | 68% | 1516 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,166 psi | 75% | 2329 fps | 95% |
| Rottweil R 903 | <<locked>> | 84% | 31,575 psi | 84% | 2365 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,908 psi | 82% | 2260 fps | 98.8% |
| Somchem S365 | 28.6 gr | 92% | 30,545 psi | 81% | 2402 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 82% | 29,240 psi | 78% | 2274 fps | 95.5% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 9 powders for 6 x 70 R loaded with the .243 | 100gr | Norma ORYX. Somchem S365 delivers the highest muzzle velocity at 2,451 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,451 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 9 of the 9 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 100.0 gr projectile in 0.243" calls for a 1:9.0 twist; slower twists will usually not stabilise this weight. Somchem S365, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 100gr | Norma ORYX 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.