Load Specifications
Load data in caliber 6 x 70 R with .243 | 105gr | Lapua ScenarL bullet and 11 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% | 33,504 psi | 89% | 2346 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,750 psi | 87% | 2326 fps | 96.3% |
| Bofors RP3 | <<locked>> | 82% | 32,126 psi | 85% | 2326 fps | 96.2% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,417 psi | 89% | 1585 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,721 psi | 89% | 1621 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,532 psi | 86% | 2398 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 84% | 32,010 psi | 85% | 2316 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,518 psi | 89% | 2257 fps | 99.5% |
| Somchem S355 | <<locked>> | 84% | 33,489 psi | 89% | 2333 fps | 96% |
| Somchem S365 | <<locked>> | 94% | 32,822 psi | 87% | 2402 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 86% | 33,649 psi | 89% | 2316 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% | 31,386 psi | 83% | 2300 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,632 psi | 81% | 2277 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 30,052 psi | 80% | 2277 fps | 95.4% |
| Hodgdon TrailBoss | 8.2 gr | 80% | 25,643 psi | 68% | 1434 fps | 100% |
| ReloadSwiss RS 14 | 8.3 gr | 80% | 25,599 psi | 68% | 1463 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,514 psi | 76% | 2283 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 82% | 29,979 psi | 80% | 2267 fps | 95% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,415 psi | 83% | 2211 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 31,430 psi | 83% | 2287 fps | 95.2% |
| Somchem S365 | 27.2 gr | 90% | 29,022 psi | 77% | 2303 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 27,702 psi | 73% | 2178 fps | 95.3% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 11 powders for 6 x 70 R loaded with the .243 | 105gr | Lapua ScenarL. Somchem S365 delivers the highest muzzle velocity at 2,402 fps; across all powders the maximum-charge window runs from 1,585 fps to 2,402 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 85–89 %, leaving at least 11 % 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 | Lapua ScenarL 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.