Load Specifications
Load data in caliber 6 x 70 R with .243 | 105gr | Hornady A-MAX 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% | 33,562 psi | 89% | 2349 fps | 99.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 32,779 psi | 87% | 2329 fps | 96.3% |
| Bofors RP3 | <<locked>> | 82% | 32,111 psi | 85% | 2329 fps | 96.3% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,634 psi | 89% | 1591 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,924 psi | 90% | 1627 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,547 psi | 86% | 2398 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 84% | 32,387 psi | 86% | 2326 fps | 96% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,576 psi | 89% | 2260 fps | 99.6% |
| Somchem S355 | <<locked>> | 84% | 33,518 psi | 89% | 2336 fps | 96.1% |
| Somchem S365 | <<locked>> | 94% | 33,141 psi | 88% | 2411 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 86% | 34,040 psi | 90% | 2329 fps | 97.7% |
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 4064 | <<locked>> | 80% | 31,459 psi | 83% | 2303 fps | 98.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 30,705 psi | 81% | 2280 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 30,110 psi | 80% | 2280 fps | 95.5% |
| Hodgdon TrailBoss | 8.2 gr | 80% | 25,469 psi | 68% | 1430 fps | 100% |
| ReloadSwiss RS 14 | 8.4 gr | 80% | 25,831 psi | 69% | 1470 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 28,543 psi | 76% | 2287 fps | 96% |
| Rottweil R 903 | <<locked>> | 82% | 30,327 psi | 80% | 2277 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,444 psi | 83% | 2215 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 31,444 psi | 83% | 2287 fps | 95.3% |
| Somchem S365 | 27.4 gr | 90% | 29,312 psi | 78% | 2313 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 28,036 psi | 74% | 2188 fps | 95.5% |
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 | Hornady A-MAX. Somchem S365 delivers the highest muzzle velocity at 2,411 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,411 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 85–90 %, leaving at least 10 % headroom. The 105.0 gr projectile in 0.243" calls for a 1:8.5 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 | 105gr | Hornady A-MAX 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.