Load Specifications
Load data in caliber 7 mm STW with .285 | 173gr | Prvi Partizan FMJ 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% | 57,740 psi | 87% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,681 psi | 85% | 2864 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 58,943 psi | 88% | 2844 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,421 psi | 86% | 2858 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 60,104 psi | 90% | 2890 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,594 psi | 85% | 2953 fps | 98.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 59,045 psi | 89% | 2910 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,900 psi | 88% | 2838 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 59,030 psi | 88% | 2822 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,247 psi | 87% | 2828 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,856 psi | 87% | 2851 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,596 psi | 89% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 60,176 psi | 90% | 2884 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,652 psi | 85% | 2848 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,392 psi | 88% | 2930 fps | 98.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,795 psi | 81% | 2851 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,653 psi | 86% | 2818 fps | 98.7% |
| Bofors RP15 | <<locked>> | 90% | 57,072 psi | 86% | 2841 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,814 psi | 90% | 2900 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,856 psi | 87% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,769 psi | 87% | 2858 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 60,191 psi | 90% | 2848 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 59,205 psi | 89% | 2835 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 59,190 psi | 89% | 2746 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 59,393 psi | 89% | 2972 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 57% | 1785 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,261 psi | 86% | 2759 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 58,015 psi | 87% | 2762 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 60,350 psi | 90% | 2825 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 90% | 59,625 psi | 89% | 2897 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 59,001 psi | 88% | 2772 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,940 psi | 81% | 2835 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 59,408 psi | 89% | 2785 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,408 psi | 89% | 2779 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,769 psi | 88% | 2822 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 55,288 psi | 83% | 2858 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,957 psi | 87% | 2867 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,553 psi | 89% | 2802 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 57,087 psi | 86% | 2864 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,755 psi | 88% | 2815 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,625 psi | 89% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 58% | 1824 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 56,188 psi | 84% | 2904 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,828 psi | 90% | 2933 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 59,379 psi | 89% | 2812 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 58,175 psi | 87% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,408 psi | 89% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,857 psi | 90% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,783 psi | 87% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,985 psi | 85% | 2749 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,566 psi | 86% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,450 psi | 88% | 2792 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,421 psi | 88% | 2779 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,508 psi | 86% | 2802 fps | 97.2% |
| Vihtavuori N550 | <<locked>> | 82% | 60,350 psi | 90% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,885 psi | 87% | 2789 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,377 psi | 86% | 2871 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 58,305 psi | 87% | 2864 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 60,176 psi | 90% | 2933 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 96% | 57,377 psi | 86% | 2936 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 90% | 60,307 psi | 90% | 2900 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,334 psi | 87% | 2789 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% | 44,121 psi | 66% | 2552 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,934 psi | 69% | 2680 fps | 97.8% |
| ADI AR 2209 | <<locked>> | 80% | 48,211 psi | 72% | 2677 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,323 psi | 65% | 2621 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 34,606 psi | 52% | 2431 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 94% | 45,266 psi | 68% | 2736 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 80% | 29,747 psi | 45% | 2343 fps | 96.8% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,443 psi | 73% | 2674 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,288 psi | 83% | 2772 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,993 psi | 72% | 2667 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 44,092 psi | 66% | 2625 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,931 psi | 64% | 2566 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,231 psi | 56% | 2513 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,660 psi | 73% | 2730 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 43,250 psi | 65% | 2667 fps | 95.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,412 psi | 70% | 2723 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,570 psi | 67% | 2592 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 41,089 psi | 62% | 2566 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 34,693 psi | 52% | 2448 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 44,092 psi | 66% | 2625 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 35,215 psi | 53% | 2448 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 46,035 psi | 69% | 2621 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,092 psi | 68% | 2605 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,982 psi | 78% | 2651 fps | 100% |
| Hodgdon Retumbo | 65.9 gr | 80% | 36,376 psi | 55% | 2552 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,398 psi | 43% | 1598 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,809 psi | 81% | 2710 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,447 psi | 82% | 2713 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,920 psi | 70% | 2612 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 42,148 psi | 63% | 2605 fps | 98% |
| IMR 7977 Enduron | <<locked>> | 92% | 55,143 psi | 83% | 2717 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,489 psi | 50% | 2434 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 55,854 psi | 84% | 2736 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 38,130 psi | 57% | 2438 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,911 psi | 82% | 2766 fps | 100% |
| Norma 217 | <<locked>> | 82% | 29,341 psi | 44% | 2343 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 47,007 psi | 70% | 2697 fps | 100% |
| Norma URP | <<locked>> | 80% | 55,912 psi | 84% | 2749 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,337 psi | 63% | 2618 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 55,027 psi | 82% | 2762 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,203 psi | 57% | 2500 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,109 psi | 44% | 1634 fps | 100% |
| ReloadSwiss RS 76 | 70.5 gr | 80% | 35,607 psi | 53% | 2530 fps | 99% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,884 psi | 57% | 2546 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 48,878 psi | 73% | 2651 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 80% | 47,659 psi | 71% | 2661 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,854 psi | 84% | 2736 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 56,231 psi | 84% | 2694 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,311 psi | 71% | 2654 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,864 psi | 75% | 2641 fps | 98.9% |
| Somchem S365 | <<locked>> | 80% | 53,940 psi | 81% | 2707 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 48,022 psi | 72% | 2635 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,032 psi | 63% | 2520 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 50,328 psi | 75% | 2687 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 56,724 psi | 85% | 2749 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,688 psi | 71% | 2641 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,630 psi | 70% | 2694 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,798 psi | 58% | 2520 fps | 96.7% |
| Vihtavuori N568 | <<locked>> | 84% | 39,218 psi | 59% | 2566 fps | 95.4% |
| Vihtavuori N570 | 76.9 gr | 90% | 46,122 psi | 69% | 2740 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,466 psi | 62% | 2628 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,324 psi | 66% | 2569 fps | 99.2% |
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 .285 | 173gr | Prvi Partizan FMJ BT. Hodgdon Retumbo delivers the highest muzzle velocity at 2,972 fps; across all powders the maximum-charge window runs from 1,785 fps to 2,972 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 173.0 gr projectile in 0.285" calls for a 1:12.0 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 .285 | 173gr | Prvi Partizan FMJ 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.