Load Specifications
Load data in caliber 6 x 70 R with .243 | 75gr | Barnes BND SPIT-FIRE bullet and 13 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.
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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2495 | <<locked>> | 88% | 33,431 psi | 89% | 2743 fps | 98.8% |
| Accurate 4064 | <<locked>> | 90% | 33,489 psi | 89% | 2756 fps | 96.6% |
| Alliant AR-Comp | <<locked>> | 82% | 32,184 psi | 85% | 2736 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,199 psi | 88% | 1903 fps | 100% |
| IMR 3031 | <<locked>> | 84% | 32,837 psi | 87% | 2762 fps | 97.7% |
| Norma 202 | <<locked>> | 84% | 33,576 psi | 89% | 2720 fps | 96% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,170 psi | 88% | 1946 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 82% | 33,547 psi | 89% | 2631 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 88% | 32,924 psi | 87% | 2631 fps | 96.9% |
| Somchem S335 | <<locked>> | 82% | 33,025 psi | 88% | 2635 fps | 96.6% |
| Vihtavuori N133 | <<locked>> | 82% | 33,330 psi | 88% | 2648 fps | 98.3% |
| Vihtavuori N135 | <<locked>> | 86% | 31,908 psi | 85% | 2694 fps | 98.3% |
| Vihtavuori N140 | <<locked>> | 86% | 33,910 psi | 90% | 2703 fps | 96.5% |
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% | 25,512 psi | 68% | 2523 fps | 96.1% |
| Accurate 4064 | <<locked>> | 86% | 29,544 psi | 78% | 2651 fps | 95% |
| Alliant AR-Comp | <<locked>> | 80% | 30,211 psi | 80% | 2684 fps | 99.5% |
| Hodgdon TrailBoss | 8.7 gr | 80% | 24,410 psi | 65% | 1703 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 28,645 psi | 76% | 2641 fps | 95.9% |
| Norma 202 | <<locked>> | 82% | 31,241 psi | 83% | 2657 fps | 95% |
| ReloadSwiss RS 14 | 8.9 gr | 80% | 24,526 psi | 65% | 1745 fps | 100% |
| SNPE Vectan Tubal 3000 | <<locked>> | 80% | 31,531 psi | 84% | 2579 fps | 95% |
| SNPE Vectan Tubal 5000 | 25.6 gr | 84% | 28,848 psi | 77% | 2523 fps | 95.2% |
| Somchem S335 | <<locked>> | 80% | 31,082 psi | 82% | 2585 fps | 95.9% |
| Vihtavuori N133 | <<locked>> | 80% | 31,314 psi | 83% | 2595 fps | 97.7% |
| Vihtavuori N135 | <<locked>> | 80% | 26,353 psi | 70% | 2536 fps | 96.2% |
| Vihtavuori N140 | <<locked>> | 84% | 31,575 psi | 84% | 2644 fps | 95.6% |
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 13 powders for 6 x 70 R loaded with the .243 | 75gr | Barnes BND SPIT-FIRE. IMR 3031 delivers the highest muzzle velocity at 2,762 fps; across all powders the maximum-charge window runs from 1,903 fps to 2,762 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 13 of the 13 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 85–90 %, leaving at least 10 % headroom. The 75.0 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 | 75gr | Barnes BND SPIT-FIRE 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.