Load Specifications
Load data in caliber 7 mm STW with .284 | 177gr | RWS ID Classic bullet and 56 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 80.
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% | 59,132 psi | 89% | 2749 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 58,146 psi | 87% | 2861 fps | 99.7% |
| ADI AR 2209 | <<locked>> | 86% | 60,046 psi | 90% | 2831 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 58,624 psi | 88% | 2851 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 57,624 psi | 86% | 2831 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 58,073 psi | 87% | 2956 fps | 99.2% |
| ADI AR 2225 | <<locked>> | 98% | 56,536 psi | 85% | 2851 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 60,220 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 59,553 psi | 89% | 2822 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 59,045 psi | 89% | 2844 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,319 psi | 86% | 2753 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,624 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,001 psi | 87% | 2835 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 60,031 psi | 90% | 2930 fps | 99.1% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 55,434 psi | 83% | 2858 fps | 98.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,842 psi | 88% | 2812 fps | 99% |
| Bofors RP15 | <<locked>> | 90% | 58,450 psi | 88% | 2835 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,537 psi | 86% | 2844 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 59,045 psi | 89% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 59,074 psi | 89% | 2848 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,464 psi | 86% | 2785 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 60,307 psi | 90% | 2825 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 60,336 psi | 90% | 2733 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 57,116 psi | 86% | 2913 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,753 psi | 57% | 1768 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,233 psi | 87% | 2749 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 59,350 psi | 89% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,725 psi | 87% | 2762 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 88% | 57,232 psi | 86% | 2838 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 59,959 psi | 90% | 2766 fps | 96.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,477 psi | 83% | 2831 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 57,000 psi | 85% | 2723 fps | 100% |
| Norma 204 | <<locked>> | 82% | 59,843 psi | 90% | 2812 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 56,942 psi | 85% | 2854 fps | 100% |
| Norma MRP | <<locked>> | 86% | 59,480 psi | 89% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,711 psi | 88% | 2861 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 59,872 psi | 90% | 2802 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 56,942 psi | 85% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,870 psi | 58% | 1811 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,943 psi | 87% | 2900 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,217 psi | 86% | 2871 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 84% | 56,768 psi | 85% | 2753 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 59,524 psi | 89% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 59,176 psi | 89% | 2812 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 58,160 psi | 87% | 2743 fps | 99.8% |
| Somchem S365 | <<locked>> | 82% | 58,755 psi | 88% | 2743 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 59,785 psi | 90% | 2782 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 59,727 psi | 90% | 2769 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 59,074 psi | 89% | 2802 fps | 97.7% |
| Vihtavuori N555 | <<locked>> | 86% | 59,074 psi | 89% | 2776 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,769 psi | 88% | 2867 fps | 99.9% |
| Vihtavuori N565 | <<locked>> | 92% | 59,785 psi | 90% | 2861 fps | 100% |
| Vihtavuori N568 | <<locked>> | 94% | 57,624 psi | 86% | 2874 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 59,045 psi | 89% | 2936 fps | 98.7% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,783 psi | 87% | 2838 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,669 psi | 89% | 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% | 45,252 psi | 68% | 2549 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 46,992 psi | 70% | 2677 fps | 98.3% |
| ADI AR 2209 | <<locked>> | 80% | 49,226 psi | 74% | 2671 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 80% | 44,498 psi | 67% | 2621 fps | 98.6% |
| ADI AR 2217 | <<locked>> | 80% | 33,127 psi | 50% | 2372 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 92% | 43,308 psi | 65% | 2677 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 30,501 psi | 46% | 2346 fps | 97.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 49,617 psi | 74% | 2671 fps | 99.8% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,153 psi | 74% | 2664 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 45,266 psi | 68% | 2625 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 43,961 psi | 66% | 2559 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 38,218 psi | 57% | 2510 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 50,140 psi | 75% | 2723 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 44,585 psi | 67% | 2674 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 94% | 44,382 psi | 67% | 2661 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 42,612 psi | 64% | 2536 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 42,047 psi | 63% | 2562 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 35,766 psi | 54% | 2451 fps | 96.7% |
| Bofors RP5 | <<locked>> | 80% | 45,266 psi | 68% | 2625 fps | 99.5% |
| Hodgdon H1000 | <<locked>> | 80% | 36,071 psi | 54% | 2448 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 46,978 psi | 70% | 2618 fps | 98.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,209 psi | 69% | 2602 fps | 98.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,055 psi | 80% | 2641 fps | 100% |
| Hodgdon Retumbo | 66.2 gr | 80% | 37,318 psi | 56% | 2556 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,442 psi | 43% | 1581 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 54,766 psi | 82% | 2700 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 55,521 psi | 83% | 2700 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 47,761 psi | 72% | 2605 fps | 98.8% |
| IMR 7828 SSC | <<locked>> | 80% | 43,366 psi | 65% | 2605 fps | 98.5% |
| IMR 7977 Enduron | <<locked>> | 92% | 56,275 psi | 84% | 2713 fps | 95.6% |
| IMR 8133 Enduron | <<locked>> | 84% | 32,271 psi | 48% | 2382 fps | 95% |
| Lovex S071 | <<locked>> | 80% | 39,044 psi | 59% | 2434 fps | 99.8% |
| Norma 204 | <<locked>> | 80% | 55,927 psi | 84% | 2756 fps | 100% |
| Norma 217 | <<locked>> | 80% | 28,326 psi | 42% | 2293 fps | 95.5% |
| Norma MRP | <<locked>> | 80% | 48,138 psi | 72% | 2690 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 43,656 psi | 65% | 2618 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 80% | 56,057 psi | 84% | 2753 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 39,218 psi | 59% | 2500 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,167 psi | 44% | 1617 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 36,709 psi | 55% | 2533 fps | 99.4% |
| ReloadSwiss RS 80 | 73.2 gr | 82% | 36,260 psi | 54% | 2487 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 49,806 psi | 75% | 2644 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 80% | 48,863 psi | 73% | 2657 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 48,515 psi | 73% | 2651 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 50,966 psi | 76% | 2635 fps | 99.2% |
| Somchem S365 | <<locked>> | 80% | 55,071 psi | 83% | 2697 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 49,182 psi | 74% | 2628 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,105 psi | 65% | 2516 fps | 99.5% |
| Vihtavuori N170 | <<locked>> | 88% | 48,196 psi | 72% | 2631 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 80% | 48,776 psi | 73% | 2635 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 47,703 psi | 72% | 2687 fps | 98.9% |
| Vihtavuori N565 | <<locked>> | 80% | 39,914 psi | 60% | 2520 fps | 97.3% |
| Vihtavuori N568 | <<locked>> | 82% | 37,492 psi | 56% | 2507 fps | 95.1% |
| Vihtavuori N570 | 75.6 gr | 88% | 44,237 psi | 66% | 2680 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 42,801 psi | 64% | 2625 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 45,440 psi | 68% | 2569 fps | 99.5% |
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 56 powders for 7 mm STW loaded with the .284 | 177gr | RWS ID Classic. ADI AR 2218 delivers the highest muzzle velocity at 2,956 fps; across all powders the maximum-charge window runs from 1,768 fps to 2,956 fps. ADI AR 2218 gives the best case fill at 100 %, and 56 of the 56 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 177.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, Alliant Reloder-50, Hodgdon TrailBoss 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 80 rank at the top here: for 7 mm STW with the .284 | 177gr | RWS ID Classic 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.