Load Specifications
Load data in caliber 6 x 70 R with .243 | 85gr | Barnes TSX BT bullet and 12 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>> | 86% | 33,562 psi | 89% | 2605 fps | 99.6% |
| Accurate 4064 | <<locked>> | 88% | 33,736 psi | 89% | 2625 fps | 98% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,243 psi | 88% | 1791 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 32,982 psi | 87% | 2628 fps | 98.9% |
| Lovex D073.6 | <<locked>> | 82% | 32,039 psi | 85% | 2572 fps | 96.2% |
| Norma 202 | <<locked>> | 82% | 33,678 psi | 89% | 2585 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,692 psi | 89% | 1841 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,039 psi | 85% | 2572 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 32,953 psi | 87% | 2503 fps | 98.2% |
| Vihtavuori N135 | <<locked>> | 84% | 32,503 psi | 86% | 2569 fps | 99.4% |
| Vihtavuori N140 | <<locked>> | 84% | 33,707 psi | 89% | 2566 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 32,474 psi | 86% | 2549 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% | 27,151 psi | 72% | 2444 fps | 98.2% |
| Accurate 4064 | <<locked>> | 82% | 27,485 psi | 73% | 2464 fps | 95.7% |
| Hodgdon TrailBoss | 8.7 gr | 80% | 24,714 psi | 66% | 1608 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 30,893 psi | 82% | 2575 fps | 98.3% |
| Lovex D073.6 | <<locked>> | 80% | 29,733 psi | 79% | 2513 fps | 95.2% |
| Norma 202 | <<locked>> | 80% | 31,285 psi | 83% | 2526 fps | 96.6% |
| ReloadSwiss RS 14 | 8.8 gr | 80% | 24,482 psi | 65% | 1640 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,733 psi | 79% | 2513 fps | 95.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,890 psi | 71% | 2346 fps | 96% |
| Vihtavuori N135 | <<locked>> | 80% | 28,137 psi | 75% | 2461 fps | 98.3% |
| Vihtavuori N140 | <<locked>> | 80% | 29,718 psi | 79% | 2467 fps | 96.5% |
| Vihtavuori N540 | <<locked>> | 80% | 28,413 psi | 75% | 2441 fps | 95.2% |
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 12 powders for 6 x 70 R loaded with the .243 | 85gr | Barnes TSX BT. IMR 3031 delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,791 fps to 2,628 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 12 of the 12 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 85.0 gr projectile in 0.243" calls for a 1:9.5 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 | 85gr | Barnes TSX 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.