Load Specifications
Load data in caliber 6 x 70 R with .243 | 105gr | Berger Hybrid Target bullet and 23 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% | 33,518 psi | 89% | 2346 fps | 99.3% |
| Accurate 4064 | <<locked>> | 82% | 33,388 psi | 89% | 2346 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,721 psi | 87% | 2326 fps | 96.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,938 psi | 87% | 2333 fps | 96.4% |
| Bofors RP3 | <<locked>> | 82% | 32,097 psi | 85% | 2326 fps | 96.2% |
| Bofors RP3 | <<locked>> | 82% | 31,981 psi | 85% | 2326 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 33,997 psi | 90% | 2365 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,417 psi | 89% | 1585 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,765 psi | 90% | 1591 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,721 psi | 89% | 1621 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,634 psi | 89% | 1621 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,532 psi | 86% | 2398 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,401 psi | 86% | 2395 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 84% | 32,010 psi | 85% | 2316 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 84% | 32,256 psi | 86% | 2323 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,547 psi | 89% | 2257 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,402 psi | 89% | 2254 fps | 99.5% |
| Somchem S355 | <<locked>> | 84% | 33,460 psi | 89% | 2333 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 33,359 psi | 88% | 2333 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 32,808 psi | 87% | 2402 fps | 97.2% |
| Somchem S365 | <<locked>> | 94% | 33,025 psi | 88% | 2408 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 86% | 33,663 psi | 89% | 2320 fps | 97.6% |
| Vihtavuori N150 | <<locked>> | 86% | 33,866 psi | 90% | 2323 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 |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 80% | 31,401 psi | 83% | 2300 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 31,285 psi | 83% | 2297 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,661 psi | 81% | 2277 fps | 95.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,879 psi | 82% | 2283 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 30,037 psi | 80% | 2277 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 29,936 psi | 79% | 2274 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 31,937 psi | 85% | 2316 fps | 95.1% |
| Hodgdon TrailBoss | 8.2 gr | 80% | 25,643 psi | 68% | 1434 fps | 100% |
| Hodgdon TrailBoss | 8.2 gr | 80% | 25,585 psi | 68% | 1434 fps | 100% |
| ReloadSwiss RS 14 | 8.4 gr | 80% | 25,585 psi | 68% | 1463 fps | 100% |
| ReloadSwiss RS 14 | 8.4 gr | 80% | 25,933 psi | 69% | 1470 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,514 psi | 76% | 2283 fps | 95.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,398 psi | 75% | 2283 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 82% | 29,950 psi | 79% | 2267 fps | 95% |
| Rottweil R 903 | <<locked>> | 82% | 30,197 psi | 80% | 2274 fps | 95.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,401 psi | 83% | 2211 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,256 psi | 83% | 2208 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 31,401 psi | 83% | 2283 fps | 95.2% |
| Somchem S355 | <<locked>> | 82% | 31,299 psi | 83% | 2283 fps | 95.2% |
| Somchem S365 | 27.3 gr | 90% | 28,993 psi | 77% | 2303 fps | 95.4% |
| Somchem S365 | 27.3 gr | 90% | 29,196 psi | 77% | 2310 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 27,673 psi | 73% | 2175 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 27,876 psi | 74% | 2182 fps | 95.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 23 powders for 6 x 70 R loaded with the .243 | 105gr | Berger Hybrid Target. Somchem S365 delivers the highest muzzle velocity at 2,408 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,408 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 23 of the 23 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 105.0 gr projectile in 0.243" calls for a 1:8.0 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 | 105gr | Berger Hybrid Target 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.