Load Specifications
Load data in caliber 6 x 70 R with .243 | 80gr | Barnes TTSX BT bullet and 14 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are SNPE Vectan Tubal 5000, 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 88% | 33,344 psi | 88% | 2671 fps | 99.2% |
| Accurate 4064 | <<locked>> | 90% | 33,533 psi | 89% | 2690 fps | 97.3% |
| Alliant AR-Comp | <<locked>> | 82% | 32,329 psi | 86% | 2671 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,214 psi | 88% | 1844 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 33,025 psi | 88% | 2697 fps | 98.3% |
| Norma 202 | <<locked>> | 84% | 33,779 psi | 90% | 2654 fps | 96.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,170 psi | 88% | 1883 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 33,939 psi | 90% | 2572 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 33,170 psi | 88% | 2572 fps | 97.6% |
| Somchem S335 | <<locked>> | 82% | 32,996 psi | 88% | 2569 fps | 97.3% |
| Vihtavuori N133 | <<locked>> | 82% | 33,837 psi | 90% | 2589 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 86% | 32,445 psi | 86% | 2638 fps | 98.9% |
| Vihtavuori N140 | <<locked>> | 84% | 31,734 psi | 84% | 2582 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 86% | 32,909 psi | 87% | 2621 fps | 96.3% |
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% | 25,121 psi | 67% | 2451 fps | 96.7% |
| Accurate 4064 | <<locked>> | 86% | 29,428 psi | 78% | 2585 fps | 95.7% |
| Alliant AR-Comp | <<locked>> | 80% | 30,269 psi | 80% | 2618 fps | 99.8% |
| Hodgdon TrailBoss | 8.6 gr | 80% | 24,265 psi | 64% | 1647 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 28,979 psi | 77% | 2589 fps | 96.9% |
| Norma 202 | <<locked>> | 80% | 29,385 psi | 78% | 2539 fps | 95% |
| ReloadSwiss RS 14 | 8.8 gr | 80% | 24,352 psi | 65% | 1686 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,850 psi | 84% | 2523 fps | 95.9% |
| SNPE Vectan Tubal 5000 | 24.8 gr | 82% | 27,383 psi | 73% | 2421 fps | 95.3% |
| Somchem S335 | <<locked>> | 80% | 31,053 psi | 82% | 2520 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 80% | 31,705 psi | 84% | 2539 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 80% | 26,556 psi | 70% | 2480 fps | 97% |
| Vihtavuori N140 | <<locked>> | 82% | 29,791 psi | 79% | 2530 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 84% | 30,603 psi | 81% | 2562 fps | 95.3% |
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 14 powders for 6 x 70 R loaded with the .243 | 80gr | Barnes TTSX BT. IMR 3031 delivers the highest muzzle velocity at 2,697 fps; across all powders the maximum-charge window runs from 1,844 fps to 2,697 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 14 of the 14 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 80.0 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. SNPE Vectan Tubal 5000, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 80gr | Barnes TTSX BT 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.