Load Specifications
Load data in caliber 7 mm STW with .284 | 180gr | Sierra MatchKing bullet and 60 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% | 57,508 psi | 86% | 2703 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,420 psi | 85% | 2808 fps | 99.6% |
| ADI AR 2209 | <<locked>> | 86% | 58,610 psi | 88% | 2785 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,261 psi | 86% | 2805 fps | 100% |
| ADI AR 2217 | <<locked>> | 98% | 59,857 psi | 90% | 2838 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,144 psi | 84% | 2900 fps | 98.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,726 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,856 psi | 88% | 2766 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,160 psi | 87% | 2779 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,696 psi | 86% | 2799 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,350 psi | 89% | 2753 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 60,002 psi | 90% | 2831 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,304 psi | 84% | 2792 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 58,102 psi | 87% | 2881 fps | 98.9% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,388 psi | 80% | 2802 fps | 97.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,595 psi | 86% | 2769 fps | 98.8% |
| Bofors RP15 | <<locked>> | 90% | 56,869 psi | 85% | 2789 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,756 psi | 90% | 2851 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,696 psi | 86% | 2799 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,392 psi | 86% | 2802 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 60,075 psi | 90% | 2795 fps | 99.9% |
| Hodgdon H4831 SC | <<locked>> | 88% | 59,045 psi | 89% | 2782 fps | 99.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 59,132 psi | 89% | 2694 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 59,234 psi | 89% | 2920 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,840 psi | 57% | 1742 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,174 psi | 86% | 2707 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,957 psi | 87% | 2710 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 60,133 psi | 90% | 2769 fps | 99.9% |
| IMR 7828 SSC | <<locked>> | 90% | 59,567 psi | 89% | 2844 fps | 100% |
| IMR 7977 Enduron | <<locked>> | 94% | 58,842 psi | 88% | 2723 fps | 96.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,722 psi | 81% | 2785 fps | 99.9% |
| Lovex S070 | <<locked>> | 82% | 59,321 psi | 89% | 2733 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,234 psi | 89% | 2726 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,639 psi | 88% | 2769 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,868 psi | 82% | 2805 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,856 psi | 87% | 2815 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,466 psi | 89% | 2746 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,782 psi | 85% | 2808 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,610 psi | 88% | 2759 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,379 psi | 89% | 2795 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,798 psi | 58% | 1781 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 55,767 psi | 84% | 2851 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,393 psi | 89% | 2881 fps | 99.9% |
| Rottweil R 904 | <<locked>> | 86% | 59,248 psi | 89% | 2759 fps | 100% |
| Rottweil R 905 | <<locked>> | 86% | 58,059 psi | 87% | 2769 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,321 psi | 89% | 2733 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,843 psi | 90% | 2687 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,667 psi | 86% | 2769 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,898 psi | 85% | 2700 fps | 99.7% |
| Somchem S365 | <<locked>> | 82% | 57,464 psi | 86% | 2703 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,450 psi | 88% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,305 psi | 87% | 2726 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,377 psi | 86% | 2753 fps | 97.4% |
| Vihtavuori N555 | <<locked>> | 86% | 57,696 psi | 86% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,217 psi | 86% | 2822 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 92% | 58,204 psi | 87% | 2815 fps | 99.9% |
| Vihtavuori N568 | <<locked>> | 96% | 59,857 psi | 90% | 2884 fps | 99.7% |
| Vihtavuori N570 | <<locked>> | 96% | 57,072 psi | 86% | 2884 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 90% | 60,002 psi | 90% | 2844 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,233 psi | 87% | 2740 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% | 44,150 psi | 66% | 2507 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,818 psi | 69% | 2635 fps | 98% |
| ADI AR 2209 | <<locked>> | 80% | 48,080 psi | 72% | 2628 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 80% | 43,236 psi | 65% | 2575 fps | 98.4% |
| ADI AR 2217 | <<locked>> | 80% | 32,372 psi | 49% | 2333 fps | 95.1% |
| ADI AR 2218 | <<locked>> | 94% | 45,020 psi | 67% | 2690 fps | 96% |
| ADI AR 2225 | <<locked>> | 80% | 29,675 psi | 44% | 2306 fps | 97.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,259 psi | 83% | 2720 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 48,080 psi | 72% | 2621 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,990 psi | 66% | 2579 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,917 psi | 64% | 2520 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,115 psi | 56% | 2467 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,602 psi | 73% | 2680 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 90% | 43,076 psi | 65% | 2625 fps | 95.5% |
| Alliant Reloder-50 | <<locked>> | 96% | 46,021 psi | 69% | 2677 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 80% | 41,785 psi | 63% | 2493 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 41,118 psi | 62% | 2523 fps | 98.8% |
| Bofors RP30 | <<locked>> | 80% | 34,708 psi | 52% | 2408 fps | 96.4% |
| Bofors RP5 | <<locked>> | 80% | 43,990 psi | 66% | 2579 fps | 99.3% |
| Hodgdon H1000 | <<locked>> | 80% | 35,143 psi | 53% | 2405 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 80% | 45,963 psi | 69% | 2575 fps | 98.4% |
| Hodgdon H4831 SC | <<locked>> | 80% | 45,005 psi | 67% | 2559 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,953 psi | 78% | 2602 fps | 100% |
| Hodgdon Retumbo | 63.9 gr | 80% | 36,274 psi | 54% | 2510 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,355 psi | 43% | 1555 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,664 psi | 80% | 2657 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,302 psi | 81% | 2657 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,775 psi | 70% | 2562 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 80% | 42,032 psi | 63% | 2559 fps | 98.2% |
| IMR 7977 Enduron | <<locked>> | 92% | 55,114 psi | 83% | 2667 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 86% | 33,344 psi | 50% | 2395 fps | 95.6% |
| Lovex S070 | <<locked>> | 80% | 55,898 psi | 84% | 2687 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 38,043 psi | 57% | 2392 fps | 99.7% |
| Norma 204 | <<locked>> | 80% | 54,650 psi | 82% | 2713 fps | 100% |
| Norma 217 | <<locked>> | 80% | 27,398 psi | 41% | 2251 fps | 95% |
| Norma MRP | <<locked>> | 80% | 46,804 psi | 70% | 2648 fps | 100% |
| Norma URP | <<locked>> | 80% | 55,941 psi | 84% | 2700 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,322 psi | 63% | 2575 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 80% | 54,766 psi | 82% | 2707 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,058 psi | 57% | 2457 fps | 98.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,095 psi | 44% | 1594 fps | 100% |
| ReloadSwiss RS 76 | 68.4 gr | 80% | 35,549 psi | 53% | 2487 fps | 99.2% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,811 psi | 57% | 2507 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 48,921 psi | 73% | 2602 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 80% | 47,703 psi | 72% | 2612 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 55,898 psi | 84% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 56,101 psi | 84% | 2641 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,355 psi | 71% | 2608 fps | 99.7% |
| Somchem S361 | <<locked>> | 80% | 49,777 psi | 75% | 2592 fps | 99% |
| Somchem S365 | <<locked>> | 80% | 53,737 psi | 81% | 2654 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,935 psi | 72% | 2585 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 42,090 psi | 63% | 2477 fps | 99.3% |
| Vihtavuori N170 | <<locked>> | 90% | 50,183 psi | 75% | 2641 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 80% | 47,500 psi | 71% | 2589 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,456 psi | 70% | 2644 fps | 98.6% |
| Vihtavuori N565 | <<locked>> | 80% | 38,725 psi | 58% | 2477 fps | 97% |
| Vihtavuori N568 | <<locked>> | 84% | 39,030 psi | 59% | 2523 fps | 95.7% |
| Vihtavuori N570 | 74.6 gr | 90% | 45,948 psi | 69% | 2694 fps | 96% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,234 psi | 62% | 2579 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,280 psi | 66% | 2526 fps | 99.3% |
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 60 powders for 7 mm STW loaded with the .284 | 180gr | Sierra MatchKing. Hodgdon Retumbo delivers the highest muzzle velocity at 2,920 fps; across all powders the maximum-charge window runs from 1,742 fps to 2,920 fps. ADI AR 2218 gives the best case fill at 100 %, and 60 of the 60 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 180.0 gr projectile in 0.284" calls for a 1:10.0 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 180gr | Sierra MatchKing 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.