Load Specifications
Load data in caliber 6 x 70 R with .243 | 115gr | DTAC RBT Closed Nose - Boron Nitride bullet and 13 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Hodgdon Hybrid 100V and ReloadSwiss RS 14.
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 |
|---|---|---|---|---|---|---|
| Alliant Reloder-17 | <<locked>> | 84% | 31,763 psi | 84% | 2264 fps | 96% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 32,982 psi | 87% | 2297 fps | 96.4% |
| Bofors RP3 | <<locked>> | 82% | 33,866 psi | 90% | 2257 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 33,402 psi | 89% | 2251 fps | 96.8% |
| Hodgdon TrailBoss | <<locked>> | 98% | 34,040 psi | 90% | 1509 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,953 psi | 90% | 1539 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 33,837 psi | 90% | 2326 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 84% | 33,750 psi | 90% | 2247 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 32,967 psi | 87% | 2247 fps | 96% |
| Somchem S355 | <<locked>> | 82% | 32,909 psi | 87% | 2215 fps | 96.8% |
| Somchem S365 | <<locked>> | 92% | 32,314 psi | 86% | 2290 fps | 98% |
| Vihtavuori N150 | <<locked>> | 84% | 33,141 psi | 88% | 2201 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,836 psi | 84% | 2178 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 |
|---|---|---|---|---|---|---|
| Alliant Reloder-17 | <<locked>> | 82% | 29,834 psi | 79% | 2215 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 98% | 31,009 psi | 82% | 2247 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 31,662 psi | 84% | 2208 fps | 97% |
| Hodgdon Hybrid 100V | 25.2 gr | 88% | 29,689 psi | 79% | 2162 fps | 95.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,991 psi | 69% | 1365 fps | 100% |
| ReloadSwiss RS 14 | 8.1 gr | 80% | 26,005 psi | 69% | 1391 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,849 psi | 79% | 2228 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 80% | 29,820 psi | 79% | 2159 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 30,922 psi | 82% | 2201 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 30,821 psi | 82% | 2165 fps | 96% |
| Somchem S365 | 25.3 gr | 86% | 26,977 psi | 72% | 2149 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 29,341 psi | 78% | 2116 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 29,979 psi | 80% | 2133 fps | 95.3% |
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 13 powders for 6 x 70 R loaded with the .243 | 115gr | DTAC RBT Closed Nose - Boron Nitride. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,326 fps; across all powders the maximum-charge window runs from 1,509 fps to 2,326 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 13 of the 13 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 115.0 gr projectile in 0.243" calls for a 1:7.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23 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. Somchem S365, Hodgdon Hybrid 100V, ReloadSwiss RS 14 rank at the top here: for 6 x 70 R with the .243 | 115gr | DTAC RBT Closed Nose - Boron Nitride 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.