Load Specifications
Load data in caliber 6 x 70 R with .243 | 80gr | Sierra SP SSPistol bullet and 10 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are 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>> | 84% | 33,576 psi | 89% | 2680 fps | 99.5% |
| Accurate 4064 | <<locked>> | 86% | 33,591 psi | 89% | 2697 fps | 97.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,910 psi | 90% | 1880 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 33,678 psi | 89% | 2687 fps | 96.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,982 psi | 90% | 1919 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 33,678 psi | 89% | 2687 fps | 96.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 32,082 psi | 85% | 2559 fps | 97.7% |
| Vihtavuori N135 | <<locked>> | 84% | 33,939 psi | 90% | 2680 fps | 99.4% |
| Vihtavuori N140 | <<locked>> | 82% | 33,185 psi | 88% | 2631 fps | 97.4% |
| Vihtavuori N540 | <<locked>> | 82% | 31,908 psi | 85% | 2612 fps | 96.4% |
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% | 29,124 psi | 77% | 2566 fps | 98.5% |
| Accurate 4064 | <<locked>> | 80% | 27,528 psi | 73% | 2533 fps | 95.2% |
| Hodgdon TrailBoss | 9.2 gr | 80% | 25,077 psi | 67% | 1683 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 31,415 psi | 83% | 2631 fps | 95.6% |
| ReloadSwiss RS 14 | 9.3 gr | 80% | 24,889 psi | 66% | 1716 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,415 psi | 83% | 2631 fps | 95.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,181 psi | 75% | 2454 fps | 96.2% |
| Vihtavuori N135 | <<locked>> | 80% | 29,718 psi | 79% | 2575 fps | 98.5% |
| Vihtavuori N140 | <<locked>> | 80% | 30,995 psi | 82% | 2575 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 80% | 29,878 psi | 79% | 2556 fps | 95.5% |
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 10 powders for 6 x 70 R loaded with the .243 | 80gr | Sierra SP SSPistol. Accurate 4064 delivers the highest muzzle velocity at 2,697 fps; across all powders the maximum-charge window runs from 1,880 fps to 2,697 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 10 of the 10 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 80.0 gr projectile in 0.243" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Hodgdon TrailBoss, ReloadSwiss RS 14 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. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 80gr | Sierra SP SSPistol 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.