Load Specifications
Load data in caliber 7 mm STW with .284 | 175gr | A-Square MONO RN bullet and 53 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 ADI AR 2218.
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>> | 86% | 57,145 psi | 86% | 2740 fps | 100% |
| Accurate 8700ᴾ | <<locked>> | 100% | 48,283 psi | 72% | 2700 fps | 96.5% |
| Accurate MAGPRO | <<locked>> | 86% | 60,176 psi | 90% | 2900 fps | 99.9% |
| ADI AR 2209 | <<locked>> | 84% | 58,102 psi | 87% | 2822 fps | 100% |
| ADI AR 2213 | <<locked>> | 86% | 56,826 psi | 85% | 2838 fps | 100% |
| ADI AR 2217 | <<locked>> | 96% | 59,857 psi | 90% | 2877 fps | 100% |
| ADI AR 2218 | <<locked>> | 98% | 56,289 psi | 84% | 2940 fps | 99% |
| ADI AR 2225 | <<locked>> | 98% | 59,219 psi | 89% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 57,711 psi | 87% | 2812 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 86% | 57,348 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 59,161 psi | 89% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 60,046 psi | 90% | 2864 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 82% | 56,173 psi | 84% | 2822 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 58,407 psi | 88% | 2917 fps | 99% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 58,523 psi | 88% | 2913 fps | 98.6% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 57,014 psi | 85% | 2802 fps | 98.9% |
| Bofors RP15 | <<locked>> | 88% | 56,753 psi | 85% | 2822 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 59,756 psi | 90% | 2887 fps | 100% |
| Bofors RP5 | <<locked>> | 86% | 57,348 psi | 86% | 2831 fps | 100% |
| Hodgdon H1000 | <<locked>> | 92% | 57,435 psi | 86% | 2841 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 59,538 psi | 89% | 2831 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 58,363 psi | 87% | 2812 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 58,407 psi | 88% | 2723 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 59,509 psi | 89% | 2956 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,985 psi | 57% | 1791 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 60,002 psi | 90% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 59,466 psi | 89% | 2802 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 88% | 59,234 psi | 89% | 2881 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 92% | 58,117 psi | 87% | 2759 fps | 96.2% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 58,044 psi | 87% | 2877 fps | 100% |
| Lovex S071 | <<locked>> | 92% | 58,929 psi | 88% | 2762 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 59,669 psi | 89% | 2900 fps | 100% |
| Norma MRP | <<locked>> | 84% | 57,537 psi | 86% | 2848 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 56,608 psi | 85% | 2844 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 59,379 psi | 89% | 2831 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,899 psi | 58% | 1831 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 56,405 psi | 85% | 2887 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 59,886 psi | 90% | 2923 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 84% | 58,233 psi | 87% | 2789 fps | 100% |
| Rottweil R 905 | <<locked>> | 84% | 57,450 psi | 86% | 2802 fps | 100% |
| SNPE Vectan SP 13ᴾ | <<locked>> | 100% | 50,270 psi | 75% | 2713 fps | 96.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 57,116 psi | 86% | 2799 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 59,915 psi | 90% | 2785 fps | 99.9% |
| Somchem S385 | <<locked>> | 84% | 57,638 psi | 86% | 2769 fps | 100% |
| Vihtavuori N165 | <<locked>> | 88% | 57,841 psi | 87% | 2762 fps | 100% |
| Vihtavuori N170 | <<locked>> | 92% | 57,029 psi | 85% | 2789 fps | 97.5% |
| Vihtavuori N555 | <<locked>> | 84% | 57,421 psi | 86% | 2769 fps | 100% |
| Vihtavuori N560 | <<locked>> | 84% | 56,840 psi | 85% | 2851 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 90% | 58,059 psi | 87% | 2848 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 60,133 psi | 90% | 2923 fps | 99.8% |
| Vihtavuori N570 | <<locked>> | 94% | 57,319 psi | 86% | 2920 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 60,365 psi | 90% | 2881 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 86% | 57,696 psi | 86% | 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% | 46,702 psi | 70% | 2582 fps | 100% |
| Accurate 8700 | <<locked>> | 98% | 44,831 psi | 67% | 2638 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 80% | 48,863 psi | 73% | 2720 fps | 98.6% |
| ADI AR 2209 | <<locked>> | 80% | 50,879 psi | 76% | 2713 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 80% | 46,108 psi | 69% | 2661 fps | 98.9% |
| ADI AR 2217 | <<locked>> | 80% | 34,418 psi | 52% | 2418 fps | 96.1% |
| ADI AR 2218 | 84 gr | 92% | 45,237 psi | 68% | 2733 fps | 96.2% |
| ADI AR 2225 | <<locked>> | 80% | 31,734 psi | 48% | 2388 fps | 98% |
| Alliant Reloder-19 | <<locked>> | 80% | 50,546 psi | 76% | 2700 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,876 psi | 70% | 2664 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,556 psi | 68% | 2595 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,856 psi | 60% | 2549 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 52,243 psi | 78% | 2766 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 88% | 43,381 psi | 65% | 2657 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 94% | 46,717 psi | 70% | 2710 fps | 96% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 44,005 psi | 66% | 2575 fps | 96.1% |
| Bofors RP15 | <<locked>> | 80% | 43,627 psi | 65% | 2605 fps | 99.2% |
| Bofors RP30 | <<locked>> | 80% | 37,130 psi | 56% | 2490 fps | 97.2% |
| Bofors RP5 | <<locked>> | 80% | 46,876 psi | 70% | 2664 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 80% | 37,420 psi | 56% | 2490 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 80% | 48,457 psi | 73% | 2657 fps | 98.9% |
| Hodgdon H4831 SC | <<locked>> | 80% | 47,703 psi | 72% | 2644 fps | 98.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 54,665 psi | 82% | 2677 fps | 100% |
| Hodgdon Retumbo | 68.9 gr | 80% | 38,870 psi | 58% | 2598 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,500 psi | 43% | 1601 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 56,376 psi | 85% | 2740 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 49,211 psi | 74% | 2644 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 80% | 44,846 psi | 67% | 2644 fps | 98.8% |
| IMR 7977 Enduron | <<locked>> | 90% | 54,476 psi | 82% | 2703 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,678 psi | 50% | 2425 fps | 95.6% |
| Lovex S071 | <<locked>> | 80% | 40,335 psi | 60% | 2470 fps | 99.9% |
| Norma 217 | <<locked>> | 80% | 29,602 psi | 44% | 2333 fps | 96.1% |
| Norma MRP | <<locked>> | 80% | 49,937 psi | 75% | 2733 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 45,353 psi | 68% | 2664 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 80% | 40,828 psi | 61% | 2539 fps | 99.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,211 psi | 44% | 1640 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 38,261 psi | 57% | 2575 fps | 99.7% |
| ReloadSwiss RS 80 | <<locked>> | 82% | 38,029 psi | 57% | 2533 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 51,372 psi | 77% | 2684 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 80% | 50,328 psi | 75% | 2694 fps | 99.9% |
| SNPE Vectan SP 13 | <<locked>> | 98% | 47,036 psi | 71% | 2657 fps | 95.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 50,024 psi | 75% | 2690 fps | 99.9% |
| Somchem S361 | <<locked>> | 80% | 52,373 psi | 79% | 2674 fps | 99.4% |
| Somchem S385 | <<locked>> | 80% | 50,734 psi | 76% | 2667 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 44,411 psi | 67% | 2552 fps | 99.6% |
| Vihtavuori N170 | <<locked>> | 88% | 49,995 psi | 75% | 2677 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 80% | 50,386 psi | 76% | 2671 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 49,429 psi | 74% | 2730 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 80% | 41,365 psi | 62% | 2559 fps | 97.7% |
| Vihtavuori N568 | <<locked>> | 82% | 39,189 psi | 59% | 2549 fps | 95.7% |
| Vihtavuori N570 | 78.7 gr | 88% | 46,340 psi | 69% | 2730 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 44,933 psi | 67% | 2664 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,905 psi | 70% | 2608 fps | 99.7% |
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 59 powders for 7 mm STW loaded with the .284 | 175gr | A-Square MONO RN. Hodgdon Retumbo delivers the highest muzzle velocity at 2,956 fps; across all powders the maximum-charge window runs from 1,791 fps to 2,956 fps. Accurate 8700 gives the best case fill at 100 %, and 59 of the 59 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 1:16.5 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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. Vihtavuori N570, Hodgdon Retumbo, ADI AR 2218 rank at the top here: for 7 mm STW with the .284 | 175gr | A-Square MONO RN they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Hodgdon US 869, Vihtavuori 20N29, Vihtavuori 24N41 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.