Load Specifications
Load data in caliber 6 x 70 R with .243 | 95gr | Nosler Partition bullet and 8 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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 32,735 psi | 87% | 2464 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 33,881 psi | 90% | 2497 fps | 96.1% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,344 psi | 88% | 1693 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,562 psi | 89% | 1732 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 32,039 psi | 85% | 2510 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 33,025 psi | 88% | 2375 fps | 99.1% |
| Somchem S365 | <<locked>> | 94% | 32,271 psi | 86% | 2516 fps | 96.1% |
| Vihtavuori N150 | <<locked>> | 86% | 33,286 psi | 88% | 2438 fps | 96.8% |
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% | 30,792 psi | 82% | 2415 fps | 98.2% |
| Bofors RP3 | <<locked>> | 82% | 31,502 psi | 84% | 2441 fps | 95.2% |
| Hodgdon TrailBoss | 8.7 gr | 80% | 25,295 psi | 67% | 1526 fps | 100% |
| ReloadSwiss RS 14 | 8.9 gr | 80% | 25,599 psi | 68% | 1565 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 29,979 psi | 80% | 2448 fps | 95.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 31,038 psi | 82% | 2329 fps | 98.7% |
| Somchem S365 | <<locked>> | 92% | 30,414 psi | 81% | 2464 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 82% | 29,167 psi | 77% | 2339 fps | 95.1% |
Recommended = one of the top powders for this cartridge and bullet combination.
This overview compares 8 powders for 6 x 70 R loaded with the .243 | 95gr | Nosler Partition. Somchem S365 delivers the highest muzzle velocity at 2,516 fps; across all powders the maximum-charge window runs from 1,693 fps to 2,516 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 8 of the 8 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 95.0 gr projectile in 0.243" calls for a 1:10.5 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 | 95gr | Nosler Partition 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.