Load Specifications
Load data in caliber 7 mm STW with .284 | 174gr | Prvi Partizan PSP BT bullet and 62 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 57,000 psi | 85% | 2740 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 60,031 psi | 90% | 2904 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 86% | 58,160 psi | 87% | 2825 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,739 psi | 85% | 2838 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 59,292 psi | 89% | 2871 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,521 psi | 83% | 2927 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,972 psi | 87% | 2890 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,349 psi | 87% | 2805 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,754 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,188 psi | 86% | 2835 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,813 psi | 88% | 2792 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,219 psi | 89% | 2864 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 60,060 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,450 psi | 86% | 2910 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,910 psi | 79% | 2831 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,188 psi | 86% | 2802 fps | 98.6% |
| Bofors RP15 | <<locked>> | 92% | 60,104 psi | 90% | 2874 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,176 psi | 89% | 2887 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,188 psi | 86% | 2835 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,869 psi | 85% | 2838 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,509 psi | 89% | 2831 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,523 psi | 88% | 2815 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,581 psi | 88% | 2730 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,610 psi | 88% | 2953 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 57% | 1775 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 60,350 psi | 90% | 2795 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,421 psi | 86% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,698 psi | 89% | 2805 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 90% | 58,900 psi | 88% | 2877 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,113 psi | 80% | 2815 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 58,827 psi | 88% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,668 psi | 88% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,015 psi | 87% | 2802 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,433 psi | 82% | 2838 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,232 psi | 86% | 2848 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,958 psi | 88% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,347 psi | 84% | 2844 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,015 psi | 87% | 2795 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,740 psi | 88% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 60,307 psi | 90% | 2858 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 59,596 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 58,784 psi | 88% | 2913 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,653 psi | 88% | 2792 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,624 psi | 86% | 2808 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,827 psi | 88% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,335 psi | 89% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,217 psi | 86% | 2802 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 60,220 psi | 90% | 2785 fps | 99.8% |
| Somchem S365 | <<locked>> | 82% | 56,927 psi | 85% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,754 psi | 87% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,725 psi | 87% | 2762 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,811 psi | 85% | 2782 fps | 97% |
| Vihtavuori N550 | <<locked>> | 82% | 59,799 psi | 90% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,043 psi | 86% | 2769 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,637 psi | 85% | 2851 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,464 psi | 86% | 2841 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 59,117 psi | 89% | 2913 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 56,318 psi | 84% | 2910 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 60,147 psi | 90% | 2723 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,408 psi | 89% | 2884 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,682 psi | 86% | 2772 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% | 43,540 psi | 65% | 2536 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,237 psi | 68% | 2661 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 47,659 psi | 71% | 2657 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 42,975 psi | 64% | 2608 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,156 psi | 51% | 2411 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 94% | 44,657 psi | 67% | 2720 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 29,341 psi | 44% | 2326 fps | 96.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,795 psi | 82% | 2756 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,456 psi | 71% | 2651 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,729 psi | 66% | 2612 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,351 psi | 63% | 2549 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,724 psi | 55% | 2497 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,124 psi | 72% | 2713 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,759 psi | 69% | 2713 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,498 psi | 68% | 2700 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,266 psi | 66% | 2579 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,538 psi | 61% | 2546 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,156 psi | 51% | 2428 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 43,729 psi | 66% | 2612 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,795 psi | 52% | 2431 fps | 96.5% |
| Hodgdon H4831 | <<locked>> | 80% | 45,527 psi | 68% | 2605 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,759 psi | 67% | 2592 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,358 psi | 77% | 2635 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 35,853 psi | 54% | 2536 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 43% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,243 psi | 80% | 2694 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,853 psi | 81% | 2697 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,412 psi | 70% | 2595 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,597 psi | 62% | 2589 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,011 psi | 49% | 2418 fps | 95% |
| Lovex S070 | <<locked>> | 80% | 55,288 psi | 83% | 2720 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,579 psi | 56% | 2421 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,389 psi | 82% | 2749 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 29,008 psi | 43% | 2329 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 46,470 psi | 70% | 2680 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 55,259 psi | 83% | 2733 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,742 psi | 63% | 2602 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 80% | 54,433 psi | 82% | 2746 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,536 psi | 56% | 2480 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 44% | 1624 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 56,188 psi | 84% | 2802 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 80% | 35,157 psi | 53% | 2513 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,289 psi | 56% | 2530 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 48,327 psi | 72% | 2631 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,282 psi | 71% | 2644 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,288 psi | 83% | 2720 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,709 psi | 84% | 2677 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,934 psi | 70% | 2641 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,458 psi | 74% | 2625 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,258 psi | 80% | 2690 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,659 psi | 71% | 2621 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,510 psi | 62% | 2503 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 49,792 psi | 75% | 2671 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 56,173 psi | 84% | 2733 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,065 psi | 71% | 2625 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,122 psi | 69% | 2677 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,290 psi | 57% | 2500 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 38,580 psi | 58% | 2546 fps | 95.1% |
| Vihtavuori N570 | 75.8 gr | 90% | 45,513 psi | 68% | 2720 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 56,289 psi | 84% | 2677 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,814 psi | 61% | 2608 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,830 psi | 66% | 2552 fps | 99.1% |
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 62 powders for 7 mm STW loaded with the .284 | 174gr | Prvi Partizan PSP BT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,953 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,953 fps. ADI AR 2218 gives the best case fill at 100 %, and 62 of the 62 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 174.0 gr projectile in 0.284" calls for a 1:11.0 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 .284 | 174gr | Prvi Partizan PSP BT 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.