Load Specifications
Load data in caliber 6 x 70 R with .243 | 85gr | MEN SPBT 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% | 33,736 psi | 89% | 2602 fps | 99.6% |
| Accurate 4064 | <<locked>> | 86% | 33,852 psi | 90% | 2621 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,736 psi | 89% | 1801 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 33,924 psi | 90% | 2612 fps | 96.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,837 psi | 90% | 1844 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 33,924 psi | 90% | 2612 fps | 96.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 32,416 psi | 86% | 2487 fps | 98.1% |
| Vihtavuori N135 | <<locked>> | 82% | 32,227 psi | 85% | 2556 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 82% | 33,272 psi | 88% | 2552 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 82% | 32,111 psi | 85% | 2536 fps | 96.9% |
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% | 29,443 psi | 78% | 2497 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 27,833 psi | 74% | 2464 fps | 95.9% |
| Hodgdon TrailBoss | 8.8 gr | 80% | 24,976 psi | 66% | 1614 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 31,879 psi | 85% | 2562 fps | 96.2% |
| ReloadSwiss RS 14 | 9 gr | 80% | 25,164 psi | 67% | 1654 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,879 psi | 85% | 2562 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,645 psi | 76% | 2392 fps | 96.8% |
| Vihtavuori N135 | <<locked>> | 80% | 30,240 psi | 80% | 2510 fps | 98.9% |
| Vihtavuori N140 | <<locked>> | 80% | 31,314 psi | 83% | 2503 fps | 97.1% |
| Vihtavuori N540 | <<locked>> | 80% | 29,950 psi | 79% | 2480 fps | 96% |
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 | 85gr | MEN SPBT. Accurate 4064 delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,801 fps to 2,621 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 85.0 gr projectile in 0.243" calls for a 1:10.0 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 | 85gr | MEN SPBT 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.