Load Specifications
Load data in caliber 6 x 70 R with .243 | 95gr | Barnes TSX 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>> | 82% | 31,734 psi | 84% | 2425 fps | 99.8% |
| Accurate 4064 | <<locked>> | 84% | 32,372 psi | 86% | 2461 fps | 98.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,721 psi | 89% | 1693 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,852 psi | 90% | 1732 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 32,169 psi | 85% | 2510 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 33,098 psi | 88% | 2375 fps | 99% |
| Vihtavuori N135 | <<locked>> | 82% | 32,924 psi | 87% | 2441 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 82% | 34,098 psi | 90% | 2441 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 88% | 33,330 psi | 88% | 2438 fps | 96.6% |
| Vihtavuori N540 | <<locked>> | 82% | 32,938 psi | 87% | 2431 fps | 98.1% |
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% | 29,660 psi | 79% | 2375 fps | 99.5% |
| Accurate 4064 | <<locked>> | 80% | 28,094 psi | 75% | 2352 fps | 97.2% |
| Hodgdon TrailBoss | 8.5 gr | 80% | 24,976 psi | 66% | 1516 fps | 100% |
| ReloadSwiss RS 14 | 8.7 gr | 80% | 25,193 psi | 67% | 1555 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 29,994 psi | 80% | 2444 fps | 95.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 29,066 psi | 77% | 2283 fps | 98% |
| Vihtavuori N135 | <<locked>> | 80% | 30,777 psi | 82% | 2392 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 80% | 31,981 psi | 85% | 2395 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 86% | 31,227 psi | 83% | 2388 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 30,603 psi | 81% | 2375 fps | 97.4% |
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 | 95gr | Barnes TSX. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,510 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,510 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 84–90 %, leaving at least 10 % headroom. The 95.0 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 | 95gr | Barnes TSX 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.