Load Specifications
Load data in caliber 6 x 70 R with .243 | 69gr | Berger LD 15 Ogive bullet and 8 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 2495, 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>> | 88% | 32,460 psi | 86% | 2828 fps | 98.1% |
| Alliant AR-Comp | <<locked>> | 84% | 33,620 psi | 89% | 2887 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 32,851 psi | 87% | 1995 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 31,894 psi | 85% | 2844 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 32,779 psi | 87% | 2037 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 32,010 psi | 85% | 2713 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 82% | 32,547 psi | 86% | 2736 fps | 97.6% |
| Vihtavuori N135 | <<locked>> | 88% | 33,228 psi | 88% | 2838 fps | 98.2% |
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 | 26.9 gr | 82% | 26,324 psi | 70% | 2651 fps | 95.8% |
| Alliant AR-Comp | <<locked>> | 80% | 29,486 psi | 78% | 2772 fps | 99% |
| Hodgdon TrailBoss | 9 gr | 80% | 24,062 psi | 64% | 1785 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 30,037 psi | 80% | 2789 fps | 95.8% |
| ReloadSwiss RS 14 | 9.2 gr | 80% | 24,134 psi | 64% | 1827 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 30,182 psi | 80% | 2664 fps | 95.1% |
| Vihtavuori N133 | <<locked>> | 80% | 30,661 psi | 81% | 2687 fps | 96.9% |
| Vihtavuori N135 | <<locked>> | 80% | 25,759 psi | 68% | 2618 fps | 95.1% |
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 8 powders for 6 x 70 R loaded with the .243 | 69gr | Berger LD 15 Ogive. Alliant AR-Comp delivers the highest muzzle velocity at 2,887 fps; across all powders the maximum-charge window runs from 1,995 fps to 2,887 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 8 of the 8 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 85–89 %, leaving at least 11 % headroom. The 69.0 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. Accurate 2495, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 69gr | Berger LD 15 Ogive 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.