Load Specifications
Load data in caliber 6 x 70 R with .243 | 85gr | Barnes X BT bullet and 4 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 4064 | <<locked>> | 82% | 33,866 psi | 90% | 2585 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,634 psi | 89% | 1785 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,910 psi | 90% | 1827 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,199 psi | 88% | 2480 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 4064 | <<locked>> | 80% | 32,010 psi | 85% | 2539 fps | 97.4% |
| Hodgdon TrailBoss | 8.7 gr | 80% | 25,672 psi | 68% | 1611 fps | 100% |
| ReloadSwiss RS 14 | 8.9 gr | 80% | 26,005 psi | 69% | 1654 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,053 psi | 82% | 2428 fps | 97.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 4 powders for 6 x 70 R loaded with the .243 | 85gr | Barnes X BT. Accurate 4064 delivers the highest muzzle velocity at 2,585 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,585 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 4 of the 4 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 88–90 %, leaving at least 10 % headroom. The 85.0 gr projectile in 0.243" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 85gr | Barnes X 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.