Load Specifications
Load data in caliber 6 x 70 R with .243 | 90gr | Speer Deep Curl Soft Point bullet and 9 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 4064 | <<locked>> | 82% | 32,329 psi | 86% | 2523 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,214 psi | 88% | 1749 fps | 100% |
| Lovex S062 | <<locked>> | 82% | 33,953 psi | 90% | 2523 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,373 psi | 89% | 1791 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 33,663 psi | 89% | 2621 fps | 97% |
| Shooters World Precision | <<locked>> | 82% | 33,953 psi | 90% | 2523 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 32,489 psi | 86% | 2434 fps | 98.7% |
| Somchem S365 | <<locked>> | 96% | 34,098 psi | 90% | 2628 fps | 96.4% |
| Vihtavuori N150 | <<locked>> | 86% | 32,808 psi | 87% | 2497 fps | 96.2% |
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% | 30,153 psi | 80% | 2467 fps | 97.6% |
| Hodgdon TrailBoss | 9 gr | 80% | 25,382 psi | 67% | 1581 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 32,039 psi | 85% | 2477 fps | 95.2% |
| ReloadSwiss RS 14 | 9.2 gr | 80% | 25,628 psi | 68% | 1624 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 31,560 psi | 84% | 2559 fps | 95.9% |
| Shooters World Precision | <<locked>> | 80% | 32,039 psi | 85% | 2477 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 30,574 psi | 81% | 2388 fps | 98.2% |
| Somchem S365 | <<locked>> | 94% | 31,865 psi | 85% | 2569 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 84% | 30,603 psi | 81% | 2441 fps | 95.3% |
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 | 90gr | Speer Deep Curl Soft Point. Somchem S365 delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,628 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 86–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 90gr | Speer Deep Curl Soft Point 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.