Load Specifications
Load data in caliber 6 x 70 R with .243 | 95gr | ShellHouse Castings SP Hard Cast bullet and 16 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate 4064, 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>> | 86% | 32,285 psi | 86% | 2438 fps | 99.8% |
| Accurate 2520 | <<locked>> | 82% | 33,547 psi | 89% | 2467 fps | 97.5% |
| Accurate 4064 | <<locked>> | 88% | 32,735 psi | 87% | 2464 fps | 98.4% |
| Alliant AR-Comp | <<locked>> | 82% | 33,837 psi | 90% | 2446 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 82% | 33,228 psi | 88% | 2464 fps | 96.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 33,750 psi | 90% | 1651 fps | 100% |
| IMR 3031 | <<locked>> | 86% | 33,910 psi | 90% | 2466 fps | 99.3% |
| Lovex D073.6 | <<locked>> | 84% | 33,547 psi | 89% | 2431 fps | 97.1% |
| Norma 202 | <<locked>> | 82% | 32,706 psi | 87% | 2386 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 33,402 psi | 89% | 1690 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 84% | 33,547 psi | 89% | 2431 fps | 97.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 32,111 psi | 85% | 2311 fps | 98.2% |
| Vihtavuori N133 | <<locked>> | 82% | 32,822 psi | 87% | 2325 fps | 99.3% |
| Vihtavuori N135 | <<locked>> | 86% | 33,794 psi | 90% | 2451 fps | 99.8% |
| Vihtavuori N140 | <<locked>> | 84% | 32,561 psi | 86% | 2365 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 84% | 32,343 psi | 86% | 2380 fps | 97.2% |
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% | 25,802 psi | 68% | 2277 fps | 98.4% |
| Accurate 2520 | <<locked>> | 80% | 30,879 psi | 82% | 2408 fps | 96.6% |
| Accurate 4064 | 23.4 gr | 80% | 24,526 psi | 65% | 2251 fps | 95.2% |
| Alliant AR-Comp | <<locked>> | 80% | 31,836 psi | 84% | 2404 fps | 100% |
| Hodgdon BL-C2 | <<locked>> | 80% | 30,995 psi | 82% | 2411 fps | 95.3% |
| Hodgdon TrailBoss | 8.1 gr | 80% | 24,555 psi | 65% | 1477 fps | 100% |
| IMR 3031 | <<locked>> | 80% | 27,615 psi | 73% | 2310 fps | 97.5% |
| Lovex D073.6 | <<locked>> | 80% | 29,080 psi | 77% | 2325 fps | 95.3% |
| Norma 202 | <<locked>> | 80% | 30,501 psi | 81% | 2333 fps | 96.7% |
| ReloadSwiss RS 14 | 8.2 gr | 80% | 24,265 psi | 64% | 1506 fps | 100% |
| Shooters World Match Rifle | <<locked>> | 80% | 29,080 psi | 77% | 2325 fps | 95.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 26,266 psi | 70% | 2168 fps | 96.1% |
| Vihtavuori N133 | <<locked>> | 80% | 30,574 psi | 81% | 2275 fps | 98.9% |
| Vihtavuori N135 | <<locked>> | 80% | 27,412 psi | 73% | 2306 fps | 98.7% |
| Vihtavuori N140 | <<locked>> | 80% | 28,660 psi | 76% | 2272 fps | 96.4% |
| Vihtavuori N540 | <<locked>> | 80% | 28,195 psi | 75% | 2278 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 16 powders for 6 x 70 R loaded with the .243 | 95gr | ShellHouse Castings SP Hard Cast. Accurate 2520 delivers the highest muzzle velocity at 2,467 fps; across all powders the maximum-charge window runs from 1,651 fps to 2,467 fps. Hodgdon TrailBoss gives the best case fill at 100 %, and 16 of the 16 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 1:12.0 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. Accurate 4064, ReloadSwiss RS 14, Hodgdon TrailBoss rank at the top here: for 6 x 70 R with the .243 | 95gr | ShellHouse Castings SP Hard Cast 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.