Load Specifications
Load data in caliber 7 mm STW with .284 | 175gr | Sierra GameKing 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% | 57,276 psi | 86% | 2740 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 60,118 psi | 90% | 2900 fps | 99.8% |
| ADI AR 2209 | <<locked>> | 86% | 58,450 psi | 88% | 2822 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,768 psi | 85% | 2838 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 59,611 psi | 89% | 2871 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 55,883 psi | 84% | 2927 fps | 98.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,320 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,595 psi | 88% | 2802 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,030 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,203 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,161 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,538 psi | 89% | 2861 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 55,985 psi | 84% | 2825 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,595 psi | 86% | 2907 fps | 98.6% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,040 psi | 80% | 2828 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,232 psi | 86% | 2799 fps | 98.6% |
| Bofors RP15 | <<locked>> | 90% | 56,637 psi | 85% | 2822 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,292 psi | 89% | 2881 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,203 psi | 86% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,217 psi | 86% | 2838 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,785 psi | 90% | 2828 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,581 psi | 88% | 2808 fps | 99.8% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,610 psi | 88% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,740 psi | 88% | 2949 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,797 psi | 57% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,942 psi | 85% | 2740 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,667 psi | 86% | 2743 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,973 psi | 90% | 2802 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 90% | 59,205 psi | 89% | 2877 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 58,508 psi | 88% | 2753 fps | 95.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,461 psi | 80% | 2815 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 59,117 psi | 89% | 2766 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,958 psi | 88% | 2759 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,262 psi | 87% | 2799 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,549 psi | 82% | 2835 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,522 psi | 86% | 2848 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,234 psi | 89% | 2782 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,449 psi | 85% | 2841 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,291 psi | 87% | 2792 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,103 psi | 89% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,740 psi | 58% | 1811 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 60,365 psi | 90% | 2851 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,017 psi | 90% | 2940 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,146 psi | 89% | 2913 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 58,929 psi | 88% | 2792 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,667 psi | 86% | 2802 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,117 psi | 89% | 2766 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,582 psi | 89% | 2723 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,276 psi | 86% | 2799 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,637 psi | 85% | 2733 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,188 psi | 86% | 2736 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,015 psi | 87% | 2772 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,044 psi | 87% | 2759 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,087 psi | 86% | 2785 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 82% | 60,060 psi | 90% | 2779 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,363 psi | 86% | 2769 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,942 psi | 85% | 2851 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 57,769 psi | 87% | 2841 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 59,451 psi | 89% | 2910 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 56,695 psi | 85% | 2913 fps | 98.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,872 psi | 90% | 2884 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,972 psi | 87% | 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% | 43,758 psi | 66% | 2533 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,469 psi | 68% | 2657 fps | 97.7% |
| ADI AR 2209 | <<locked>> | 80% | 47,877 psi | 72% | 2657 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 80% | 43,033 psi | 65% | 2602 fps | 98.2% |
| ADI AR 2217 | <<locked>> | 82% | 34,360 psi | 52% | 2415 fps | 95.8% |
| ADI AR 2218 | <<locked>> | 94% | 44,933 psi | 67% | 2720 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 80% | 29,515 psi | 44% | 2329 fps | 96.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,839 psi | 82% | 2753 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,688 psi | 71% | 2651 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,787 psi | 66% | 2608 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,569 psi | 64% | 2546 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,927 psi | 55% | 2493 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,399 psi | 73% | 2710 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 42,627 psi | 64% | 2648 fps | 95% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,643 psi | 68% | 2697 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,295 psi | 66% | 2575 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 40,770 psi | 61% | 2549 fps | 98.5% |
| Bofors RP30 | <<locked>> | 80% | 34,374 psi | 52% | 2431 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 43,787 psi | 66% | 2608 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 80% | 34,983 psi | 52% | 2431 fps | 96.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,556 psi | 68% | 2602 fps | 98.2% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,802 psi | 67% | 2585 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,605 psi | 77% | 2631 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 36,056 psi | 54% | 2536 fps | 98.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,282 psi | 42% | 1581 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,490 psi | 80% | 2694 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,085 psi | 81% | 2694 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,630 psi | 70% | 2595 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 80% | 41,843 psi | 63% | 2589 fps | 98% |
| IMR 7977 Enduron | <<locked>> | 92% | 54,853 psi | 82% | 2697 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,214 psi | 50% | 2421 fps | 95.3% |
| Lovex S070 | <<locked>> | 80% | 55,506 psi | 83% | 2717 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,768 psi | 57% | 2421 fps | 99.5% |
| Norma 204 | <<locked>> | 80% | 54,375 psi | 82% | 2743 fps | 100% |
| Norma 217 | <<locked>> | 82% | 29,051 psi | 44% | 2326 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 46,528 psi | 70% | 2677 fps | 100% |
| Norma URP | <<locked>> | 80% | 55,535 psi | 83% | 2733 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,018 psi | 63% | 2602 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 80% | 54,491 psi | 82% | 2740 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,782 psi | 57% | 2484 fps | 98.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,182 psi | 44% | 1621 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 56,260 psi | 84% | 2799 fps | 100% |
| ReloadSwiss RS 76 | 69.4 gr | 80% | 35,215 psi | 53% | 2510 fps | 98.9% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,565 psi | 56% | 2530 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 48,544 psi | 73% | 2631 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 80% | 47,311 psi | 71% | 2641 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,506 psi | 83% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,883 psi | 84% | 2674 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,963 psi | 70% | 2635 fps | 99.6% |
| Somchem S361 | <<locked>> | 80% | 49,501 psi | 74% | 2621 fps | 98.8% |
| Somchem S365 | <<locked>> | 80% | 53,505 psi | 80% | 2687 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,732 psi | 72% | 2618 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,727 psi | 63% | 2500 fps | 99.2% |
| Vihtavuori N170 | <<locked>> | 90% | 49,864 psi | 75% | 2667 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 56,217 psi | 84% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,297 psi | 71% | 2621 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,180 psi | 69% | 2671 fps | 98.4% |
| Vihtavuori N565 | <<locked>> | 80% | 38,493 psi | 58% | 2500 fps | 96.6% |
| Vihtavuori N568 | <<locked>> | 84% | 38,841 psi | 58% | 2549 fps | 95.4% |
| Vihtavuori N570 | 75.7 gr | 90% | 45,614 psi | 68% | 2720 fps | 95.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,886 psi | 61% | 2605 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,063 psi | 66% | 2552 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 69 powders for 7 mm STW loaded with the .284 | 175gr | Sierra GameKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,949 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,949 fps. Accurate 8700 gives the best case fill at 100 %, and 69 of the 69 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 175.0 gr projectile in 0.284" calls for a 1:10.5 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 175gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, Hodgdon US 869, Lovex D100 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.