Load Specifications
Load data in caliber 7 mm STW with .284 | 160gr | Winchester Silvertip 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% | 57,188 psi | 86% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 60,133 psi | 90% | 3009 fps | 99.5% |
| ADI AR 2209 | <<locked>> | 86% | 58,363 psi | 87% | 2936 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 56,782 psi | 85% | 2946 fps | 99.7% |
| ADI AR 2217 | <<locked>> | 98% | 59,480 psi | 89% | 2979 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,159 psi | 84% | 3035 fps | 98.1% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,320 psi | 87% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,436 psi | 88% | 2920 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,885 psi | 87% | 2923 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,232 psi | 86% | 2940 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,016 psi | 88% | 2900 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,567 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 60,278 psi | 90% | 2992 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,957 psi | 87% | 3012 fps | 98.2% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,461 psi | 80% | 2930 fps | 96.8% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,334 psi | 86% | 2907 fps | 98.2% |
| Bofors RP15 | <<locked>> | 90% | 56,652 psi | 85% | 2933 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,263 psi | 89% | 2989 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,232 psi | 86% | 2940 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,072 psi | 86% | 2943 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 59,741 psi | 90% | 2940 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,610 psi | 88% | 2923 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,508 psi | 88% | 2841 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 58,827 psi | 88% | 3064 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,768 psi | 57% | 1864 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 56,811 psi | 85% | 2854 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,551 psi | 86% | 2854 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,930 psi | 90% | 2913 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 90% | 59,074 psi | 89% | 2989 fps | 99.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,490 psi | 80% | 2917 fps | 99.6% |
| Lovex S070 | <<locked>> | 82% | 59,030 psi | 88% | 2881 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,001 psi | 88% | 2871 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,044 psi | 87% | 2910 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,737 psi | 82% | 2943 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,493 psi | 86% | 2956 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,132 psi | 89% | 2897 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,420 psi | 85% | 2949 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 82% | 58,044 psi | 87% | 2904 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,248 psi | 89% | 2940 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 58% | 1906 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 60,321 psi | 90% | 2969 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,220 psi | 90% | 3054 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,292 psi | 89% | 3022 fps | 99.6% |
| Rottweil R 904 | <<locked>> | 86% | 58,682 psi | 88% | 2900 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 57,609 psi | 86% | 2913 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,030 psi | 88% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,422 psi | 89% | 2835 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,217 psi | 86% | 2910 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,608 psi | 85% | 2841 fps | 99.4% |
| Somchem S365 | <<locked>> | 82% | 57,043 psi | 86% | 2851 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,015 psi | 87% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,928 psi | 87% | 2871 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,130 psi | 86% | 2887 fps | 96.6% |
| Vihtavuori N550 | <<locked>> | 82% | 59,930 psi | 90% | 2894 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,130 psi | 86% | 2881 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 56,869 psi | 85% | 2959 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 92% | 57,928 psi | 87% | 2953 fps | 99.7% |
| Vihtavuori N568 | <<locked>> | 96% | 59,698 psi | 89% | 3022 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 96% | 56,710 psi | 85% | 3018 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 60,292 psi | 90% | 2835 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,640 psi | 89% | 2992 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,870 psi | 87% | 2881 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% | 43,613 psi | 65% | 2631 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,411 psi | 68% | 2756 fps | 97.1% |
| ADI AR 2209 | <<locked>> | 80% | 47,732 psi | 72% | 2762 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 80% | 42,931 psi | 64% | 2700 fps | 97.5% |
| ADI AR 2217 | <<locked>> | 84% | 36,709 psi | 55% | 2559 fps | 95.9% |
| ADI AR 2218 | <<locked>> | 96% | 48,327 psi | 72% | 2884 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 29,370 psi | 44% | 2405 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,607 psi | 82% | 2864 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,500 psi | 71% | 2753 fps | 99.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,700 psi | 66% | 2707 fps | 98.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,366 psi | 64% | 2648 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 36,782 psi | 55% | 2585 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,225 psi | 72% | 2815 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 46,108 psi | 69% | 2805 fps | 95.3% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,443 psi | 74% | 2861 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,324 psi | 66% | 2674 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 40,640 psi | 61% | 2644 fps | 97.9% |
| Bofors RP30 | <<locked>> | 82% | 36,680 psi | 55% | 2575 fps | 96% |
| Bofors RP5 | <<locked>> | 80% | 43,700 psi | 66% | 2707 fps | 98.7% |
| Hodgdon H1000 | <<locked>> | 80% | 34,766 psi | 52% | 2513 fps | 95.7% |
| Hodgdon H4831 | <<locked>> | 80% | 45,440 psi | 68% | 2700 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,730 psi | 67% | 2687 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,416 psi | 77% | 2743 fps | 100% |
| Hodgdon Retumbo | 68.9 gr | 80% | 35,839 psi | 54% | 2621 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,326 psi | 42% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,359 psi | 80% | 2802 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 53,954 psi | 81% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,499 psi | 70% | 2694 fps | 97.9% |
| IMR 7828 SSC | <<locked>> | 80% | 41,611 psi | 62% | 2680 fps | 97.2% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,331 psi | 53% | 2556 fps | 95.2% |
| Lovex S070 | <<locked>> | 80% | 55,419 psi | 83% | 2828 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,608 psi | 56% | 2510 fps | 99.1% |
| Norma 204 | <<locked>> | 80% | 54,389 psi | 82% | 2854 fps | 99.8% |
| Norma 217 | <<locked>> | 84% | 31,140 psi | 47% | 2467 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 46,398 psi | 70% | 2776 fps | 99.8% |
| Norma URP | <<locked>> | 80% | 55,434 psi | 83% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,756 psi | 63% | 2694 fps | 97.6% |
| Ramshot Hunter | <<locked>> | 80% | 54,491 psi | 82% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,579 psi | 56% | 2569 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,993 psi | 43% | 1706 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 56,188 psi | 84% | 2913 fps | 100% |
| ReloadSwiss RS 76 | 73.7 gr | 80% | 35,114 psi | 53% | 2592 fps | 98.2% |
| ReloadSwiss RS 80 | <<locked>> | 86% | 40,451 psi | 61% | 2684 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 80% | 48,472 psi | 73% | 2736 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 80% | 47,152 psi | 71% | 2743 fps | 99.3% |
| Shooters World SW4350 | <<locked>> | 80% | 55,419 psi | 83% | 2828 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,709 psi | 84% | 2782 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,847 psi | 70% | 2740 fps | 99.2% |
| Somchem S361 | <<locked>> | 80% | 49,429 psi | 74% | 2723 fps | 98.4% |
| Somchem S365 | <<locked>> | 80% | 53,330 psi | 80% | 2799 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,645 psi | 71% | 2720 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 80% | 41,568 psi | 62% | 2595 fps | 98.7% |
| Vihtavuori N170 | <<locked>> | 92% | 53,359 psi | 80% | 2828 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 56,072 psi | 84% | 2838 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,050 psi | 71% | 2726 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,035 psi | 69% | 2772 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 80% | 38,334 psi | 57% | 2589 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 86% | 41,640 psi | 62% | 2700 fps | 95.5% |
| Vihtavuori N570 | 82.2 gr | 92% | 49,023 psi | 73% | 2881 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 56,202 psi | 84% | 2782 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,799 psi | 61% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 43,918 psi | 66% | 2651 fps | 98.7% |
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 | 160gr | Winchester Silvertip. Hodgdon Retumbo delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,864 fps to 3,064 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 160.0 gr projectile in 0.284" calls for a 1:16.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 160gr | Winchester Silvertip 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.