Load Specifications
Load data in caliber 6 x 70 R with .243 | 88gr | CutEdge MTH bullet and 12 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 2495 | <<locked>> | 86% | 33,866 psi | 90% | 2566 fps | 99.7% |
| Accurate 4064 | <<locked>> | 88% | 34,055 psi | 90% | 2589 fps | 98.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,721 psi | 89% | 1762 fps | 100% |
| IMR 3031 | <<locked>> | 82% | 33,547 psi | 89% | 2595 fps | 99.2% |
| Lovex D073.6 | <<locked>> | 82% | 32,343 psi | 86% | 2536 fps | 96.6% |
| Norma 202 | <<locked>> | 82% | 33,866 psi | 90% | 2546 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,765 psi | 90% | 1801 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 82% | 32,343 psi | 86% | 2536 fps | 96.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 33,127 psi | 88% | 2464 fps | 98.4% |
| Vihtavuori N135 | <<locked>> | 84% | 32,706 psi | 87% | 2526 fps | 99.5% |
| Vihtavuori N140 | <<locked>> | 82% | 31,836 psi | 84% | 2477 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 84% | 32,750 psi | 87% | 2513 fps | 97.3% |
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% | 27,296 psi | 72% | 2405 fps | 98.4% |
| Accurate 4064 | <<locked>> | 80% | 25,889 psi | 69% | 2375 fps | 95.2% |
| Hodgdon TrailBoss | 8.5 gr | 80% | 24,613 psi | 65% | 1568 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 31,024 psi | 82% | 2533 fps | 98.6% |
| Lovex D073.6 | <<locked>> | 80% | 30,298 psi | 80% | 2484 fps | 95.8% |
| Norma 202 | <<locked>> | 80% | 31,749 psi | 84% | 2493 fps | 97.1% |
| ReloadSwiss RS 14 | 8.7 gr | 80% | 24,772 psi | 66% | 1611 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 30,298 psi | 80% | 2484 fps | 95.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 27,224 psi | 72% | 2316 fps | 96.4% |
| Vihtavuori N135 | <<locked>> | 80% | 28,558 psi | 76% | 2428 fps | 98.7% |
| Vihtavuori N140 | <<locked>> | 80% | 29,863 psi | 79% | 2428 fps | 96.8% |
| Vihtavuori N540 | <<locked>> | 80% | 28,587 psi | 76% | 2405 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 12 powders for 6 x 70 R loaded with the .243 | 88gr | CutEdge MTH. IMR 3031 delivers the highest muzzle velocity at 2,595 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,595 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 12 of the 12 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (260 MPa), the top charges use 84–90 %, leaving at least 10 % headroom. The 88.0 gr projectile in 0.243" calls for a 1:8.5 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 | 88gr | CutEdge MTH 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.