Load Specifications
Load data in caliber 6 x 70 R with .243 | 90gr | SUS-TAC HPT bullet and 11 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>> | 84% | 32,953 psi | 87% | 2500 fps | 99.6% |
| Accurate 4064 | <<locked>> | 86% | 33,156 psi | 88% | 2523 fps | 98.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,924 psi | 90% | 1729 fps | 100% |
| Lovex D073.6 | <<locked>> | 82% | 33,315 psi | 88% | 2513 fps | 97% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 34,069 psi | 90% | 1768 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 33,315 psi | 88% | 2513 fps | 97% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 33,750 psi | 90% | 2434 fps | 98.6% |
| Vihtavuori N135 | <<locked>> | 84% | 33,431 psi | 89% | 2500 fps | 99.6% |
| Vihtavuori N140 | <<locked>> | 82% | 32,880 psi | 87% | 2461 fps | 97.8% |
| Vihtavuori N150 | <<locked>> | 90% | 34,026 psi | 90% | 2497 fps | 95.9% |
| Vihtavuori N540 | <<locked>> | 84% | 33,576 psi | 89% | 2487 fps | 97.5% |
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% | 28,848 psi | 77% | 2398 fps | 98.9% |
| Accurate 4064 | <<locked>> | 80% | 27,296 psi | 72% | 2369 fps | 95.9% |
| Hodgdon TrailBoss | 8.3 gr | 80% | 25,019 psi | 66% | 1545 fps | 100% |
| Lovex D073.6 | <<locked>> | 80% | 31,227 psi | 83% | 2464 fps | 96.2% |
| ReloadSwiss RS 14 | 8.5 gr | 80% | 25,251 psi | 67% | 1585 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 31,227 psi | 83% | 2464 fps | 96.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 28,065 psi | 74% | 2297 fps | 96.8% |
| Vihtavuori N135 | <<locked>> | 80% | 29,559 psi | 78% | 2408 fps | 98.9% |
| Vihtavuori N140 | <<locked>> | 80% | 30,835 psi | 82% | 2408 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 88% | 31,894 psi | 85% | 2444 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 29,631 psi | 79% | 2392 fps | 96.1% |
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 11 powders for 6 x 70 R loaded with the .243 | 90gr | SUS-TAC HPT. Accurate 4064 delivers the highest muzzle velocity at 2,523 fps; across all powders the maximum-charge window runs from 1,729 fps to 2,523 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 11 of the 11 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 87–90 %, leaving at least 10 % headroom. The 90.0 gr projectile in 0.243" calls for a 1:8.0 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 | 90gr | SUS-TAC HPT 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.