Load Specifications
Load data in caliber 7 mm STW with .284 | 175gr | Barnes X S 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, ReloadSwiss RS 76 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% | 59,973 psi | 90% | 2753 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 58,334 psi | 87% | 2858 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 60,046 psi | 90% | 2828 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 58,639 psi | 88% | 2848 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 96% | 57,305 psi | 86% | 2825 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 57,754 psi | 87% | 2943 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 60,191 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 60,263 psi | 90% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 59,799 psi | 90% | 2818 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 59,379 psi | 89% | 2844 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 88% | 57,580 psi | 86% | 2756 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 92% | 57,696 psi | 86% | 2825 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 58,436 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 59,770 psi | 90% | 2927 fps | 98.8% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 56,130 psi | 84% | 2864 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 58,450 psi | 88% | 2802 fps | 98.7% |
| Bofors RP15 | <<locked>> | 90% | 58,566 psi | 88% | 2831 fps | 100% |
| Bofors RP30 | <<locked>> | 94% | 57,711 psi | 87% | 2844 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 59,379 psi | 89% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 58,929 psi | 88% | 2844 fps | 100% |
| Hodgdon H4831 | <<locked>> | 86% | 57,566 psi | 86% | 2782 fps | 99.7% |
| Hodgdon H4831 SC | <<locked>> | 86% | 56,637 psi | 85% | 2766 fps | 99.6% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 57,072 psi | 86% | 2687 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 92% | 56,840 psi | 85% | 2913 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 38,014 psi | 57% | 1759 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 58,595 psi | 88% | 2749 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 59,930 psi | 90% | 2753 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 86% | 57,870 psi | 87% | 2756 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 88% | 57,043 psi | 86% | 2831 fps | 99.9% |
| IMR 7977 Enduron | <<locked>> | 94% | 59,886 psi | 90% | 2753 fps | 95.9% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 55,898 psi | 84% | 2838 fps | 99.9% |
| Lovex S071 | <<locked>> | 92% | 58,131 psi | 87% | 2733 fps | 100% |
| Norma 204 | <<locked>> | 82% | 59,930 psi | 90% | 2805 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 57,159 psi | 86% | 2861 fps | 100% |
| Norma MRP | <<locked>> | 86% | 59,640 psi | 89% | 2861 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 58,436 psi | 88% | 2854 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 60,060 psi | 90% | 2802 fps | 100% |
| Ramshot Magnum | <<locked>> | 90% | 57,029 psi | 85% | 2789 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 39,030 psi | 59% | 1801 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 57,653 psi | 86% | 2900 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 94% | 57,246 psi | 86% | 2874 fps | 99.7% |
| Rottweil R 904 | <<locked>> | 84% | 56,811 psi | 85% | 2743 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 86% | 59,640 psi | 89% | 2812 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 59,234 psi | 89% | 2808 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 58,407 psi | 88% | 2740 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 59,480 psi | 89% | 2749 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 60,307 psi | 90% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 59,930 psi | 90% | 2769 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 59,437 psi | 89% | 2802 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 86% | 59,901 psi | 90% | 2785 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 58,827 psi | 88% | 2864 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 60,176 psi | 90% | 2861 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 94% | 57,769 psi | 87% | 2874 fps | 99.4% |
| Vihtavuori N570 | <<locked>> | 96% | 58,842 psi | 88% | 2933 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 88% | 57,943 psi | 87% | 2848 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 59,828 psi | 90% | 2779 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% | 2562 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 47,790 psi | 72% | 2687 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 80% | 49,647 psi | 74% | 2671 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 44,947 psi | 67% | 2625 fps | 98.5% |
| ADI AR 2217 | <<locked>> | 80% | 34,258 psi | 51% | 2392 fps | 95.6% |
| ADI AR 2218 | <<locked>> | 92% | 43,932 psi | 66% | 2680 fps | 95% |
| ADI AR 2225 | <<locked>> | 80% | 31,937 psi | 48% | 2379 fps | 97.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 56,739 psi | 85% | 2762 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 49,559 psi | 74% | 2664 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 46,035 psi | 69% | 2635 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 45,034 psi | 68% | 2572 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 39,189 psi | 59% | 2530 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 80% | 51,010 psi | 76% | 2740 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 45,136 psi | 68% | 2684 fps | 95.8% |
| Alliant Reloder-50 | <<locked>> | 94% | 45,600 psi | 68% | 2687 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 43,250 psi | 65% | 2539 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 43,004 psi | 64% | 2575 fps | 98.9% |
| Bofors RP30 | <<locked>> | 80% | 36,999 psi | 55% | 2474 fps | 96.9% |
| Bofors RP5 | <<locked>> | 80% | 46,035 psi | 69% | 2635 fps | 99.4% |
| Hodgdon H1000 | <<locked>> | 80% | 37,028 psi | 56% | 2461 fps | 97.4% |
| Hodgdon H4831 | <<locked>> | 80% | 47,485 psi | 71% | 2618 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 46,717 psi | 70% | 2605 fps | 98.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 53,708 psi | 81% | 2644 fps | 100% |
| Hodgdon Retumbo | 63.3 gr | 80% | 38,377 psi | 58% | 2575 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,660 psi | 43% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 55,114 psi | 83% | 2700 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 56,304 psi | 84% | 2707 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 48,327 psi | 72% | 2605 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 43,888 psi | 66% | 2612 fps | 98.3% |
| IMR 7977 Enduron | <<locked>> | 92% | 56,449 psi | 85% | 2703 fps | 95.1% |
| IMR 8133 Enduron | <<locked>> | 84% | 33,591 psi | 50% | 2415 fps | 95.4% |
| Lovex S071 | <<locked>> | 80% | 40,799 psi | 61% | 2457 fps | 99.8% |
| Norma 204 | <<locked>> | 80% | 56,246 psi | 84% | 2756 fps | 100% |
| Norma 217 | <<locked>> | 80% | 30,052 psi | 45% | 2339 fps | 96.3% |
| Norma MRP | <<locked>> | 80% | 48,950 psi | 73% | 2703 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 44,150 psi | 66% | 2628 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 80% | 56,478 psi | 85% | 2753 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 40,190 psi | 60% | 2516 fps | 99.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,457 psi | 44% | 1614 fps | 100% |
| ReloadSwiss RS 76 | 67.7 gr | 80% | 37,768 psi | 57% | 2556 fps | 99.5% |
| ReloadSwiss RS 80 | 70 gr | 82% | 37,565 psi | 56% | 2520 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 50,285 psi | 75% | 2644 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 49,603 psi | 74% | 2661 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 49,240 psi | 74% | 2657 fps | 99.8% |
| Somchem S361 | <<locked>> | 80% | 51,401 psi | 77% | 2635 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 55,767 psi | 84% | 2703 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 50,067 psi | 75% | 2638 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 43,888 psi | 66% | 2523 fps | 99.4% |
| Vihtavuori N170 | <<locked>> | 88% | 49,023 psi | 73% | 2635 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 80% | 49,966 psi | 75% | 2644 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 48,385 psi | 73% | 2697 fps | 98.7% |
| Vihtavuori N565 | <<locked>> | 80% | 41,147 psi | 62% | 2539 fps | 97.4% |
| Vihtavuori N568 | <<locked>> | 82% | 38,682 psi | 58% | 2530 fps | 95.2% |
| Vihtavuori N570 | <<locked>> | 88% | 44,846 psi | 67% | 2694 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 80% | 43,613 psi | 65% | 2644 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 46,224 psi | 69% | 2575 fps | 99.4% |
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 | 175gr | Barnes X S. ADI AR 2218 delivers the highest muzzle velocity at 2,943 fps; across all powders the maximum-charge window runs from 1,759 fps to 2,943 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 175.0 gr projectile in 0.284" calls for a 1:9.5 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. Hodgdon Retumbo, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 7 mm STW with the .284 | 175gr | Barnes X S 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.