Load Specifications
Load data in caliber 7 mm STW with .285 | 173gr | Prvi Partizan SP bullet and 60 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo and ReloadSwiss RS 76.
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: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 58,088 psi | 87% | 2762 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 57,246 psi | 86% | 2871 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 59,277 psi | 89% | 2848 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,769 psi | 87% | 2864 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 56,666 psi | 85% | 2844 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,014 psi | 85% | 2959 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 59,582 psi | 89% | 2917 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 59,451 psi | 89% | 2828 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,813 psi | 88% | 2838 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 58,204 psi | 87% | 2858 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 60,220 psi | 90% | 2815 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 56,681 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 57,029 psi | 85% | 2851 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 59,146 psi | 89% | 2943 fps | 98.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 54,491 psi | 82% | 2864 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,117 psi | 87% | 2825 fps | 98.8% |
| Bofors RP15 | <<locked>> | 90% | 57,624 psi | 86% | 2848 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 56,565 psi | 85% | 2858 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 58,204 psi | 87% | 2858 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 58,320 psi | 87% | 2867 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 56,710 psi | 85% | 2799 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 59,524 psi | 89% | 2841 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 59,625 psi | 89% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 60,031 psi | 90% | 2979 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 57% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,580 psi | 86% | 2766 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,639 psi | 88% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,043 psi | 86% | 2779 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 60,249 psi | 90% | 2907 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 59,451 psi | 89% | 2782 fps | 96% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 54,708 psi | 82% | 2844 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 59,988 psi | 90% | 2795 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,959 psi | 90% | 2785 fps | 100% |
| Norma 204 | <<locked>> | 82% | 59,103 psi | 89% | 2828 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,854 psi | 84% | 2864 fps | 100% |
| Norma MRP | <<locked>> | 86% | 58,581 psi | 88% | 2874 fps | 100% |
| Norma URP | <<locked>> | 82% | 60,191 psi | 90% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,725 psi | 87% | 2874 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 59,117 psi | 89% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 55,956 psi | 84% | 2802 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,856 psi | 58% | 1831 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,811 psi | 85% | 2913 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 56,144 psi | 84% | 2881 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 59,712 psi | 90% | 2818 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 58,755 psi | 88% | 2831 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,988 psi | 90% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 60,205 psi | 90% | 2746 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 58,363 psi | 87% | 2828 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 57,450 psi | 86% | 2759 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 57,986 psi | 87% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 59,030 psi | 88% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,929 psi | 88% | 2785 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 58,175 psi | 87% | 2815 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 86% | 58,276 psi | 87% | 2795 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,914 psi | 87% | 2881 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 58,842 psi | 88% | 2871 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 56,637 psi | 85% | 2884 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 96% | 57,928 psi | 87% | 2943 fps | 98.4% |
| Winchester StaBALL HD | <<locked>> | 88% | 56,724 psi | 85% | 2854 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,856 psi | 88% | 2799 fps | 100% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 80% | 44,454 psi | 67% | 2556 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,282 psi | 69% | 2687 fps | 97.9% |
| ADI AR 2209 | <<locked>> | 80% | 48,617 psi | 73% | 2684 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 43,874 psi | 66% | 2631 fps | 98.3% |
| ADI AR 2217 | <<locked>> | 82% | 35,027 psi | 53% | 2441 fps | 96% |
| ADI AR 2218 | <<locked>> | 94% | 45,861 psi | 69% | 2753 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 30,008 psi | 45% | 2352 fps | 96.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,724 psi | 84% | 2779 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,341 psi | 72% | 2674 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,643 psi | 67% | 2638 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,323 psi | 65% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,594 psi | 56% | 2520 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 49,298 psi | 74% | 2736 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 43,714 psi | 66% | 2677 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,862 psi | 70% | 2730 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,105 psi | 63% | 2546 fps | 95.1% |
| Bofors RP15 | <<locked>> | 80% | 41,437 psi | 62% | 2575 fps | 98.6% |
| Bofors RP30 | <<locked>> | 80% | 35,027 psi | 53% | 2454 fps | 96.1% |
| Bofors RP5 | <<locked>> | 80% | 44,643 psi | 67% | 2638 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,534 psi | 53% | 2457 fps | 96.9% |
| Hodgdon H4831 | <<locked>> | 80% | 46,340 psi | 69% | 2628 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,600 psi | 68% | 2615 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 52,388 psi | 79% | 2657 fps | 100% |
| Hodgdon Retumbo | 66.4 gr | 80% | 36,695 psi | 55% | 2562 fps | 98.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,456 psi | 43% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,157 psi | 81% | 2717 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,868 psi | 82% | 2720 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,239 psi | 71% | 2618 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 80% | 42,525 psi | 64% | 2615 fps | 98.1% |
| IMR 7977 Enduron | <<locked>> | 92% | 55,608 psi | 83% | 2723 fps | 95.2% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,924 psi | 51% | 2444 fps | 95.5% |
| Lovex S070 | <<locked>> | 80% | 56,217 psi | 84% | 2743 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 38,493 psi | 58% | 2444 fps | 99.6% |
| Norma 204 | <<locked>> | 80% | 55,259 psi | 83% | 2772 fps | 100% |
| Norma 217 | <<locked>> | 82% | 29,791 psi | 45% | 2356 fps | 96% |
| Norma MRP | <<locked>> | 80% | 47,369 psi | 71% | 2703 fps | 100% |
| Norma URP | <<locked>> | 80% | 56,304 psi | 84% | 2759 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,714 psi | 64% | 2628 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 80% | 55,361 psi | 83% | 2766 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,537 psi | 58% | 2507 fps | 98.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 44% | 1637 fps | 100% |
| ReloadSwiss RS 76 | 71.1 gr | 80% | 36,042 psi | 54% | 2539 fps | 99.1% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 38,377 psi | 58% | 2559 fps | 95.8% |
| Rottweil R 904 | <<locked>> | 80% | 49,226 psi | 74% | 2657 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 48,022 psi | 72% | 2667 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 56,217 psi | 84% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 56,565 psi | 85% | 2697 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,674 psi | 71% | 2664 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 50,357 psi | 75% | 2651 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 54,360 psi | 81% | 2713 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,573 psi | 73% | 2644 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,351 psi | 63% | 2523 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 50,720 psi | 76% | 2694 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 80% | 48,095 psi | 72% | 2648 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,978 psi | 70% | 2700 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 80% | 39,131 psi | 59% | 2526 fps | 96.8% |
| Vihtavuori N568 | <<locked>> | 84% | 39,537 psi | 59% | 2572 fps | 95.5% |
| Vihtavuori N570 | 77.5 gr | 90% | 46,644 psi | 70% | 2749 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,930 psi | 63% | 2635 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,817 psi | 67% | 2579 fps | 99.3% |
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 60 powders for 7 mm STW loaded with the .285 | 173gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,979 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .285 | 173gr | Prvi Partizan SP 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.