Load Specifications
Load data in caliber 6 x 70 R with .243 | 100gr | Remington PSP Core-Lokt bullet and 9 powders. The key underlying parameters are shown in the table above.
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 |
|---|---|---|---|---|---|---|
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 34,084 psi | 90% | 2434 fps | 96.7% |
| Bofors RP3 | <<locked>> | 82% | 33,344 psi | 88% | 2431 fps | 96.6% |
| Hodgdon TrailBoss | <<locked>> | 98% | 33,692 psi | 89% | 1660 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 98% | 33,953 psi | 90% | 1696 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 33,562 psi | 89% | 2503 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 84% | 33,576 psi | 89% | 2428 fps | 96.3% |
| Somchem S365 | <<locked>> | 92% | 32,010 psi | 85% | 2461 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 84% | 32,982 psi | 87% | 2379 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 33,910 psi | 90% | 2402 fps | 95.9% |
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 32,068 psi | 85% | 2388 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 31,372 psi | 83% | 2382 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 25,657 psi | 68% | 1496 fps | 100% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 25,962 psi | 69% | 1535 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 29,646 psi | 79% | 2395 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 82% | 31,256 psi | 83% | 2372 fps | 95.4% |
| Somchem S365 | <<locked>> | 90% | 30,211 psi | 80% | 2411 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 28,921 psi | 77% | 2280 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 31,807 psi | 84% | 2349 fps | 95% |
This overview compares 9 powders for 6 x 70 R loaded with the .243 | 100gr | Remington PSP Core-Lokt. ReloadSwiss RS 60 delivers the highest muzzle velocity at 2,503 fps; across all powders the maximum-charge window runs from 1,660 fps to 2,503 fps. Hodgdon TrailBoss gives the best case fill at 98 %, and 9 of the 9 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 100.0 gr projectile in 0.243" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.