Load Specifications
Load data in caliber 6 x 70 R with .243 | 100gr | Hornady InterLock RN bullet and 8 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 |
|---|---|---|---|---|---|---|
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,707 psi | 89% | 2444 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,866 psi | 90% | 1670 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 96% | 33,301 psi | 88% | 1693 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 32,010 psi | 85% | 2470 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 84% | 34,084 psi | 90% | 2444 fps | 96.6% |
| Somchem S355 | <<locked>> | 82% | 33,170 psi | 88% | 2408 fps | 96% |
| Somchem S365 | <<locked>> | 92% | 32,663 psi | 87% | 2484 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 84% | 33,460 psi | 89% | 2395 fps | 97.6% |
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 |
|---|---|---|---|---|---|---|
| Hodgdon Hybrid 100V | <<locked>> | 90% | 31,807 psi | 84% | 2398 fps | 95.2% |
| Hodgdon TrailBoss | 9 gr | 80% | 25,918 psi | 69% | 1509 fps | 100% |
| ReloadSwiss RS 14 | 9.1 gr | 80% | 25,875 psi | 69% | 1539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,008 psi | 80% | 2411 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 80% | 29,892 psi | 79% | 2343 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 30,966 psi | 82% | 2352 fps | 95.1% |
| Somchem S365 | 29.1 gr | 88% | 28,848 psi | 77% | 2379 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,385 psi | 78% | 2297 fps | 96.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 8 powders for 6 x 70 R loaded with the .243 | 100gr | Hornady InterLock RN. Somchem S365 delivers the highest muzzle velocity at 2,484 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,484 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 8 of the 8 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 1:12.0 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 | Hornady InterLock RN 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.