Load Specifications
Load data in caliber 7 mm STW with .284 | 173gr | RWS H-Mantel bullet and 64 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Hodgdon Retumbo, Vihtavuori N570 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% | 56,753 psi | 85% | 2743 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 59,756 psi | 90% | 2907 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 86% | 57,928 psi | 87% | 2828 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,478 psi | 85% | 2844 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 58,987 psi | 88% | 2877 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,245 psi | 83% | 2927 fps | 98.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 57,653 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,102 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,522 psi | 86% | 2818 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 56,927 psi | 85% | 2838 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,552 psi | 88% | 2795 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,929 psi | 88% | 2867 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 59,756 psi | 90% | 2887 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,130 psi | 86% | 2910 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,576 psi | 79% | 2835 fps | 97.2% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 56,971 psi | 85% | 2805 fps | 98.5% |
| Bofors RP15 | <<locked>> | 92% | 59,828 psi | 90% | 2881 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,885 psi | 88% | 2887 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 56,927 psi | 85% | 2838 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 56,594 psi | 85% | 2841 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,277 psi | 89% | 2831 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,276 psi | 87% | 2818 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,349 psi | 87% | 2733 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,276 psi | 87% | 2959 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 57% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 60,133 psi | 90% | 2799 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,203 psi | 86% | 2749 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,480 psi | 89% | 2808 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 90% | 58,624 psi | 88% | 2884 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,823 psi | 79% | 2815 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 60,162 psi | 90% | 2769 fps | 100% |
| Lovex S070 | <<locked>> | 82% | 58,624 psi | 88% | 2772 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,421 psi | 88% | 2766 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,783 psi | 87% | 2805 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,114 psi | 81% | 2841 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,956 psi | 85% | 2851 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,740 psi | 88% | 2789 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 60,133 psi | 90% | 2904 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 57,783 psi | 87% | 2802 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,436 psi | 88% | 2835 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,682 psi | 58% | 1818 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 60,046 psi | 90% | 2861 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 59,248 psi | 89% | 2946 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 58,450 psi | 88% | 2917 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 86% | 58,421 psi | 88% | 2795 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,377 psi | 86% | 2812 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 60,162 psi | 90% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,624 psi | 88% | 2772 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,146 psi | 89% | 2730 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,985 psi | 85% | 2805 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 59,988 psi | 90% | 2789 fps | 99.8% |
| Somchem S365 | <<locked>> | 82% | 56,681 psi | 85% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,522 psi | 86% | 2779 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,493 psi | 86% | 2766 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,565 psi | 85% | 2789 fps | 96.9% |
| Vihtavuori N550 | <<locked>> | 82% | 59,567 psi | 89% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 56,797 psi | 85% | 2776 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,391 psi | 85% | 2854 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 57,188 psi | 86% | 2848 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 58,813 psi | 88% | 2913 fps | 99.5% |
| Vihtavuori N570 | <<locked>> | 98% | 60,234 psi | 90% | 2979 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 59,915 psi | 90% | 2730 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,074 psi | 89% | 2887 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,435 psi | 86% | 2779 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% | 43,337 psi | 65% | 2536 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,005 psi | 67% | 2661 fps | 97.5% |
| ADI AR 2209 | <<locked>> | 80% | 47,456 psi | 71% | 2664 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 42,772 psi | 64% | 2608 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 33,997 psi | 51% | 2415 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 94% | 44,425 psi | 67% | 2717 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 29,196 psi | 44% | 2329 fps | 96.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,578 psi | 82% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,253 psi | 71% | 2654 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,526 psi | 65% | 2615 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,148 psi | 63% | 2552 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,535 psi | 55% | 2497 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 47,863 psi | 72% | 2717 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 45,498 psi | 68% | 2713 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,223 psi | 68% | 2700 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,106 psi | 66% | 2582 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 40,350 psi | 60% | 2552 fps | 98.3% |
| Bofors RP30 | <<locked>> | 80% | 33,968 psi | 51% | 2431 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 43,526 psi | 65% | 2615 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,635 psi | 52% | 2434 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 45,324 psi | 68% | 2608 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,570 psi | 67% | 2595 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,140 psi | 77% | 2638 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 35,665 psi | 53% | 2536 fps | 98% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,413 psi | 43% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,055 psi | 80% | 2697 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,635 psi | 80% | 2700 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,238 psi | 69% | 2598 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,394 psi | 62% | 2589 fps | 97.7% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,201 psi | 53% | 2480 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 56,536 psi | 85% | 2723 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 55,100 psi | 83% | 2723 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,405 psi | 56% | 2421 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 54,172 psi | 81% | 2753 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 28,834 psi | 43% | 2329 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 46,253 psi | 69% | 2684 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 55,042 psi | 83% | 2736 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,524 psi | 62% | 2602 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 54,215 psi | 81% | 2749 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,318 psi | 56% | 2484 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,124 psi | 44% | 1631 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 55,941 psi | 84% | 2808 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 80% | 34,969 psi | 52% | 2513 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,072 psi | 56% | 2530 fps | 95.1% |
| Rottweil R 904 | <<locked>> | 80% | 48,138 psi | 72% | 2635 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 47,079 psi | 71% | 2648 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 56,536 psi | 85% | 2723 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 55,100 psi | 83% | 2723 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,506 psi | 83% | 2680 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,731 psi | 70% | 2644 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,269 psi | 74% | 2628 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 53,011 psi | 79% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,471 psi | 71% | 2625 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,321 psi | 62% | 2503 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 49,574 psi | 74% | 2674 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 55,970 psi | 84% | 2736 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 46,847 psi | 70% | 2628 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 45,919 psi | 69% | 2677 fps | 98.2% |
| Vihtavuori N565 | <<locked>> | 80% | 38,087 psi | 57% | 2503 fps | 96.3% |
| Vihtavuori N568 | <<locked>> | 84% | 38,363 psi | 57% | 2549 fps | 95% |
| Vihtavuori N570 | 75.8 gr | 90% | 45,252 psi | 68% | 2723 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 56,072 psi | 84% | 2680 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,567 psi | 61% | 2615 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,642 psi | 65% | 2556 fps | 99% |
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 71 powders for 7 mm STW loaded with the .284 | 173gr | RWS H-Mantel. Vihtavuori N570 delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,778 fps to 2,979 fps. Accurate 8700 gives the best case fill at 100 %, and 71 of the 71 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 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, ADI AR 2218, ADI AR 2225 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. Hodgdon Retumbo, Vihtavuori N570, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 173gr | RWS H-Mantel they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Lovex D100, Ramshot LRT burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.