Load Specifications
Load data in caliber 6 x 70 R with .243 | 105gr | Hornady AEROMATCH bullet and 8 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 |
|---|---|---|---|---|---|---|
| Hodgdon Hybrid 100V | <<locked>> | 92% | 34,069 psi | 90% | 2356 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 98% | 34,098 psi | 90% | 1591 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 96% | 33,605 psi | 89% | 1614 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 32,605 psi | 86% | 2385 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 82% | 32,837 psi | 87% | 2316 fps | 96.1% |
| Somchem S355 | <<locked>> | 82% | 33,750 psi | 90% | 2323 fps | 96.1% |
| Somchem S365 | <<locked>> | 92% | 33,330 psi | 88% | 2402 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 84% | 34,113 psi | 90% | 2313 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 |
|---|---|---|---|---|---|---|
| Hodgdon Hybrid 100V | <<locked>> | 90% | 32,155 psi | 85% | 2310 fps | 95.1% |
| Hodgdon TrailBoss | 8.2 gr | 80% | 25,976 psi | 69% | 1434 fps | 100% |
| ReloadSwiss RS 14 | 8.4 gr | 80% | 26,411 psi | 70% | 1473 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 30,734 psi | 82% | 2336 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 80% | 30,922 psi | 82% | 2274 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 31,807 psi | 84% | 2277 fps | 95.4% |
| Somchem S365 | 26.8 gr | 88% | 29,689 psi | 79% | 2306 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 30,182 psi | 80% | 2224 fps | 96.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 24 powders for 6 x 70 R loaded with the .243 | 105gr | Hornady AEROMATCH. Vihtavuori N555 delivers the highest muzzle velocity at 2,425 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,425 fps. Accurate 3100 gives the best case fill at 100 %, and 24 of the 24 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 81–90 %, 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. Accurate 3100, Alliant Reloder-23, Winchester StaBALL HD 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, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 105gr | Hornady AEROMATCH they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 3100, Accurate 4350, Alliant Reloder-16 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.