Load Specifications
Load data in caliber 6 x 70 R with .243 | 107gr | SUS-TAC HPT bullet and 15 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 2495 | <<locked>> | 82% | 33,228 psi | 88% | 2277 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 33,272 psi | 88% | 2300 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 33,040 psi | 88% | 2290 fps | 96.1% |
| Bofors RP3 | <<locked>> | 84% | 32,097 psi | 85% | 2283 fps | 95.9% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 33,794 psi | 90% | 2333 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,388 psi | 89% | 1542 fps | 100% |
| Lovex S062 | <<locked>> | 82% | 33,388 psi | 89% | 2264 fps | 96.7% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,707 psi | 89% | 1578 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 32,706 psi | 87% | 2349 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 33,388 psi | 89% | 2264 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 33,910 psi | 90% | 2221 fps | 99.5% |
| Somchem S365 | <<locked>> | 96% | 32,851 psi | 87% | 2356 fps | 96.8% |
| Vihtavuori N135 | <<locked>> | 82% | 33,663 psi | 89% | 2277 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 33,895 psi | 90% | 2280 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 82% | 33,533 psi | 89% | 2270 fps | 98.7% |
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 2495 | <<locked>> | 80% | 30,966 psi | 82% | 2231 fps | 99.9% |
| Accurate 4064 | <<locked>> | 80% | 29,283 psi | 78% | 2211 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 30,821 psi | 82% | 2241 fps | 95.3% |
| Bofors RP3 | <<locked>> | 82% | 29,907 psi | 79% | 2231 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 31,618 psi | 84% | 2280 fps | 95.5% |
| Hodgdon TrailBoss | 7.7 gr | 80% | 25,556 psi | 68% | 1394 fps | 100% |
| Lovex S062 | <<locked>> | 80% | 31,212 psi | 83% | 2215 fps | 95.9% |
| ReloadSwiss RS 14 | 7.8 gr | 80% | 25,512 psi | 68% | 1424 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 28,747 psi | 76% | 2241 fps | 95.5% |
| Shooters World Precision | <<locked>> | 80% | 31,212 psi | 83% | 2215 fps | 95.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,805 psi | 79% | 2133 fps | 98.7% |
| Somchem S365 | 26 gr | 92% | 29,109 psi | 77% | 2257 fps | 95% |
| Vihtavuori N135 | <<locked>> | 80% | 31,720 psi | 84% | 2238 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 27,876 psi | 74% | 2139 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 31,357 psi | 83% | 2221 fps | 98.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 15 powders for 6 x 70 R loaded with the .243 | 107gr | SUS-TAC HPT. Somchem S365 delivers the highest muzzle velocity at 2,356 fps; across all powders the maximum-charge window runs from 1,542 fps to 2,356 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 15 of the 15 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 107.0 gr projectile in 0.243" calls for a 1:6.5 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 | 107gr | SUS-TAC HPT 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.