Load Specifications
Load data in caliber 6 x 70 R with .243 | 90gr | Lapua ScenarL bullet and 9 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>> | 82% | 32,053 psi | 85% | 2487 fps | 99.6% |
| Accurate 4064 | <<locked>> | 84% | 32,605 psi | 86% | 2520 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,866 psi | 90% | 1742 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,026 psi | 90% | 1781 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 32,982 psi | 87% | 2428 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 82% | 32,822 psi | 87% | 2497 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 82% | 33,910 psi | 90% | 2493 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 88% | 33,127 psi | 88% | 2487 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 82% | 32,837 psi | 87% | 2484 fps | 97.5% |
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% | 30,052 psi | 80% | 2438 fps | 99.3% |
| Accurate 4064 | <<locked>> | 80% | 28,442 psi | 75% | 2411 fps | 96.7% |
| Hodgdon TrailBoss | 8.6 gr | 80% | 25,237 psi | 67% | 1562 fps | 100% |
| ReloadSwiss RS 14 | 8.7 gr | 80% | 25,092 psi | 67% | 1594 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,066 psi | 77% | 2333 fps | 97.4% |
| Vihtavuori N135 | <<locked>> | 80% | 30,734 psi | 82% | 2448 fps | 99.3% |
| Vihtavuori N140 | <<locked>> | 80% | 31,879 psi | 85% | 2448 fps | 97.7% |
| Vihtavuori N150 | <<locked>> | 86% | 31,154 psi | 83% | 2441 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 30,574 psi | 81% | 2428 fps | 96.8% |
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 9 powders for 6 x 70 R loaded with the .243 | 90gr | Lapua ScenarL. Accurate 4064 delivers the highest muzzle velocity at 2,520 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,520 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 9 of the 9 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 90.0 gr projectile in 0.243" calls for a 1:9.0 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 | 90gr | 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.