Load Specifications
Load data in caliber 7 mm STW with .284 | 173gr | Sellier & Bellot SPCE 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 88% | 57,406 psi | 86% | 2753 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,391 psi | 85% | 2858 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 58,624 psi | 88% | 2838 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,869 psi | 85% | 2851 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 59,582 psi | 89% | 2884 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,941 psi | 84% | 2940 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,508 psi | 88% | 2904 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,595 psi | 88% | 2831 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,595 psi | 88% | 2831 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,639 psi | 88% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,957 psi | 87% | 2825 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,319 psi | 86% | 2844 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,263 psi | 89% | 2802 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,611 psi | 89% | 2877 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,072 psi | 84% | 2838 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,928 psi | 87% | 2923 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,345 psi | 80% | 2844 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,435 psi | 86% | 2815 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 56,753 psi | 85% | 2835 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,495 psi | 89% | 2897 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,319 psi | 86% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,203 psi | 86% | 2851 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,872 psi | 90% | 2841 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,682 psi | 88% | 2825 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,871 psi | 88% | 2740 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 59,001 psi | 88% | 2969 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,681 psi | 56% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,942 psi | 85% | 2756 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,682 psi | 86% | 2756 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 60,046 psi | 90% | 2818 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 90% | 59,335 psi | 89% | 2894 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,650 psi | 80% | 2828 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 59,321 psi | 89% | 2782 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,074 psi | 89% | 2776 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,436 psi | 88% | 2815 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,737 psi | 82% | 2851 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,667 psi | 86% | 2861 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,451 psi | 89% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,739 psi | 85% | 2858 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,436 psi | 88% | 2808 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,321 psi | 89% | 2844 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,783 psi | 58% | 1824 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,220 psi | 90% | 2956 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,321 psi | 89% | 2930 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,827 psi | 88% | 2805 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,841 psi | 87% | 2818 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,321 psi | 89% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,582 psi | 89% | 2736 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,464 psi | 86% | 2815 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,724 psi | 85% | 2746 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,188 psi | 86% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,160 psi | 87% | 2789 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,117 psi | 87% | 2772 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,290 psi | 86% | 2799 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 82% | 60,031 psi | 90% | 2792 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,508 psi | 86% | 2785 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,043 psi | 86% | 2864 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 58,059 psi | 87% | 2858 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 59,640 psi | 89% | 2927 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 56,884 psi | 85% | 2927 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,915 psi | 90% | 2894 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,059 psi | 87% | 2785 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% | 43,961 psi | 66% | 2549 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,614 psi | 68% | 2674 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 47,921 psi | 72% | 2671 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,207 psi | 65% | 2618 fps | 98.1% |
| ADI AR 2217 | <<locked>> | 82% | 34,505 psi | 52% | 2428 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 94% | 44,889 psi | 67% | 2730 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 80% | 29,544 psi | 44% | 2339 fps | 96.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,341 psi | 72% | 2674 fps | 99.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,341 psi | 72% | 2674 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,129 psi | 83% | 2769 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,892 psi | 72% | 2667 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,976 psi | 66% | 2625 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,598 psi | 64% | 2559 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,956 psi | 55% | 2507 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,327 psi | 72% | 2723 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 46,209 psi | 69% | 2726 fps | 96.1% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,963 psi | 69% | 2713 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,367 psi | 67% | 2589 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,785 psi | 61% | 2559 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,534 psi | 52% | 2444 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 43,976 psi | 66% | 2625 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 80% | 34,983 psi | 52% | 2441 fps | 96.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,730 psi | 69% | 2618 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,976 psi | 67% | 2602 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,648 psi | 77% | 2648 fps | 100% |
| Hodgdon Retumbo | 65.5 gr | 80% | 36,071 psi | 54% | 2546 fps | 98.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,427 psi | 43% | 1594 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,490 psi | 80% | 2707 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,128 psi | 81% | 2707 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,630 psi | 70% | 2605 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 80% | 41,843 psi | 63% | 2598 fps | 97.9% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,185 psi | 50% | 2428 fps | 95.1% |
| Lovex S070 | <<locked>> | 80% | 55,506 psi | 83% | 2730 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,840 psi | 57% | 2431 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,592 psi | 82% | 2759 fps | 100% |
| Norma 217 | <<locked>> | 82% | 29,211 psi | 44% | 2339 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 46,688 psi | 70% | 2690 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 55,535 psi | 83% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,003 psi | 63% | 2612 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 54,694 psi | 82% | 2756 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,913 psi | 57% | 2497 fps | 98.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 44% | 1634 fps | 100% |
| ReloadSwiss RS 76 | 70.1 gr | 80% | 35,346 psi | 53% | 2520 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,623 psi | 56% | 2543 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 48,573 psi | 73% | 2644 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,543 psi | 71% | 2657 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,506 psi | 83% | 2730 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,883 psi | 84% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,195 psi | 71% | 2654 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,617 psi | 74% | 2635 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,548 psi | 80% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,921 psi | 72% | 2631 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,916 psi | 63% | 2516 fps | 99.1% |
| Vihtavuori N170 | <<locked>> | 90% | 50,082 psi | 75% | 2684 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 56,391 psi | 85% | 2743 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,355 psi | 71% | 2638 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,325 psi | 69% | 2687 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,493 psi | 58% | 2513 fps | 96.5% |
| Vihtavuori N568 | <<locked>> | 84% | 38,943 psi | 58% | 2559 fps | 95.3% |
| Vihtavuori N570 | 76.5 gr | 90% | 45,832 psi | 69% | 2733 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,075 psi | 62% | 2621 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,034 psi | 66% | 2566 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 | 173gr | Sellier & Bellot SPCE. Hodgdon Retumbo delivers the highest muzzle velocity at 2,969 fps; across all powders the maximum-charge window runs from 1,778 fps to 2,969 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 56–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.284" calls for a 1:11.5 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 .284 | 173gr | Sellier & Bellot SPCE 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.