Load Specifications
Load data in caliber 7 mm STW with .284 | 150gr | Sierra MatchKing bullet and 73 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 Winchester StaBALL HD.
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>> | 92% | 60,031 psi | 90% | 2966 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 56,550 psi | 85% | 2936 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 59,103 psi | 89% | 3071 fps | 99% |
| ADI AR 2209 | <<locked>> | 88% | 57,566 psi | 86% | 2999 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 59,915 psi | 90% | 3071 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,175 psi | 87% | 3038 fps | 99.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,533 psi | 79% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,754 psi | 87% | 2992 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,116 psi | 86% | 2989 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 60,176 psi | 90% | 3064 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 57,827 psi | 87% | 2972 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 57,812 psi | 87% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,798 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,811 psi | 84% | 3058 fps | 97.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,753 psi | 85% | 2966 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 59,292 psi | 89% | 3051 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 57,609 psi | 86% | 3045 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 60,176 psi | 90% | 3064 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 57,957 psi | 87% | 2936 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 59,843 psi | 90% | 3061 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,030 psi | 87% | 2989 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 60,234 psi | 90% | 3005 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 59,176 psi | 89% | 3002 fps | 99.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,001 psi | 87% | 2986 fps | 99.1% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 57,798 psi | 87% | 2913 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,768 psi | 85% | 3120 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,074 psi | 89% | 3028 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,521 psi | 56% | 1906 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 60,176 psi | 90% | 2979 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,161 psi | 89% | 2956 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 56,840 psi | 85% | 2927 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,524 psi | 89% | 2982 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 58,015 psi | 87% | 3051 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,080 psi | 72% | 2904 fps | 98.4% |
| Lovex S065 | <<locked>> | 84% | 60,292 psi | 90% | 2956 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,566 psi | 88% | 2953 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,624 psi | 86% | 2933 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,827 psi | 87% | 2982 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 48,689 psi | 73% | 2927 fps | 99.8% |
| Norma MRP | <<locked>> | 90% | 60,292 psi | 90% | 3081 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,465 psi | 88% | 2969 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,350 psi | 89% | 3074 fps | 99.8% |
| Ramshot Hunter | <<locked>> | 84% | 57,653 psi | 86% | 2979 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 57,740 psi | 87% | 3002 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,363 psi | 57% | 1949 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 56,898 psi | 85% | 2959 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,451 psi | 89% | 3041 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,870 psi | 87% | 3114 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,305 psi | 86% | 3068 fps | 99% |
| Rottweil R 904 | <<locked>> | 88% | 58,349 psi | 87% | 2969 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 88% | 56,927 psi | 85% | 2982 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,957 psi | 87% | 2936 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 60,292 psi | 90% | 2956 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,566 psi | 88% | 2953 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,524 psi | 89% | 2910 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 60,278 psi | 90% | 3031 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 60,133 psi | 90% | 2959 fps | 99.3% |
| Somchem S365 | <<locked>> | 86% | 60,002 psi | 90% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,232 psi | 86% | 2949 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 60,365 psi | 90% | 2890 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 60,220 psi | 90% | 2963 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,029 psi | 85% | 2930 fps | 99.9% |
| Vihtavuori N170 | <<locked>> | 98% | 60,336 psi | 90% | 3005 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 84% | 59,437 psi | 89% | 2966 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 59,799 psi | 90% | 2999 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,727 psi | 90% | 3084 fps | 99.4% |
| Vihtavuori N565 | <<locked>> | 96% | 60,350 psi | 90% | 3064 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 57,856 psi | 87% | 3071 fps | 98.6% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 58,987 psi | 88% | 3133 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,973 psi | 90% | 2910 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,233 psi | 87% | 2992 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,348 psi | 86% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,261 psi | 86% | 2946 fps | 99.8% |
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% | 40,059 psi | 60% | 2635 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 52,982 psi | 79% | 2884 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 44,338 psi | 66% | 2808 fps | 95.9% |
| ADI AR 2209 | <<locked>> | 80% | 43,918 psi | 66% | 2762 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 39,363 psi | 59% | 2694 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 38,406 psi | 58% | 2664 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 84% | 30,618 psi | 46% | 2500 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 50,633 psi | 76% | 2887 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,005 psi | 66% | 2756 fps | 98.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,943 psi | 60% | 2700 fps | 97.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,580 psi | 58% | 2654 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,359 psi | 50% | 2572 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,511 psi | 65% | 2815 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 51,706 psi | 78% | 2986 fps | 96.1% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 49,995 psi | 75% | 2848 fps | 95.8% |
| Bofors RP15 | <<locked>> | 80% | 37,217 psi | 56% | 2638 fps | 96% |
| Bofors RP30 | <<locked>> | 86% | 38,232 psi | 57% | 2680 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 39,943 psi | 60% | 2700 fps | 97.1% |
| Bofors RP7 | <<locked>> | 80% | 54,462 psi | 82% | 2884 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 36,593 psi | 55% | 2625 fps | 95.5% |
| Hodgdon H414 | <<locked>> | 80% | 54,259 psi | 81% | 2933 fps | 100% |
| Hodgdon H4350 | <<locked>> | 80% | 56,434 psi | 85% | 2946 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 80% | 41,887 psi | 63% | 2697 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,205 psi | 62% | 2684 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,558 psi | 71% | 2762 fps | 100% |
| Hodgdon Retumbo | 68.4 gr | 82% | 34,896 psi | 52% | 2661 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 54,955 psi | 82% | 2966 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 42% | 1709 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,647 psi | 74% | 2815 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,680 psi | 83% | 2904 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 49,893 psi | 75% | 2822 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,221 psi | 65% | 2697 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 80% | 38,101 psi | 57% | 2671 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 94% | 39,044 psi | 59% | 2720 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 53,171 psi | 80% | 2851 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 51,779 psi | 78% | 2848 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 34,461 psi | 52% | 2510 fps | 97.7% |
| Norma 204 | <<locked>> | 80% | 50,270 psi | 75% | 2858 fps | 99% |
| Norma 217 | <<locked>> | 88% | 31,937 psi | 48% | 2559 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 42,322 psi | 63% | 2776 fps | 98.8% |
| Norma URP | <<locked>> | 80% | 51,474 psi | 77% | 2864 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 37,840 psi | 57% | 2677 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 50,285 psi | 75% | 2864 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,011 psi | 51% | 2556 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,790 psi | 43% | 1749 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,200 psi | 80% | 2904 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,459 psi | 77% | 2927 fps | 100% |
| ReloadSwiss RS 76 | 71.4 gr | 80% | 31,734 psi | 48% | 2562 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,061 psi | 63% | 2789 fps | 95.4% |
| Rottweil R 904 | <<locked>> | 80% | 44,904 psi | 67% | 2736 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 43,497 psi | 65% | 2746 fps | 98.1% |
| Rottweil R 907 | <<locked>> | 80% | 54,462 psi | 82% | 2884 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,171 psi | 80% | 2851 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 51,779 psi | 78% | 2848 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,112 psi | 78% | 2799 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,178 psi | 65% | 2740 fps | 98% |
| Somchem S361 | <<locked>> | 80% | 45,963 psi | 69% | 2726 fps | 96.9% |
| Somchem S365 | <<locked>> | 80% | 48,892 psi | 73% | 2818 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,961 psi | 66% | 2723 fps | 98.8% |
| Vihtavuori N150 | <<locked>> | 80% | 56,710 psi | 85% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,866 psi | 79% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,305 psi | 57% | 2595 fps | 97.2% |
| Vihtavuori N170 | <<locked>> | 96% | 56,188 psi | 84% | 2936 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,141 psi | 78% | 2858 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,134 psi | 65% | 2736 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,163 psi | 63% | 2766 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 84% | 40,059 psi | 60% | 2697 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 90% | 43,207 psi | 65% | 2805 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 96% | 50,879 psi | 76% | 2989 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,185 psi | 78% | 2805 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,491 psi | 82% | 2936 fps | 100% |
| Winchester StaBALL HD | 68.5 gr | 80% | 35,911 psi | 54% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,408 psi | 61% | 2648 fps | 97.2% |
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 73 powders for 7 mm STW loaded with the .284 | 150gr | Sierra MatchKing. Vihtavuori N570 delivers the highest muzzle velocity at 3,133 fps; across all powders the maximum-charge window runs from 1,906 fps to 3,133 fps. ADI AR 2217 gives the best case fill at 100 %, and 73 of the 73 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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, Winchester StaBALL HD rank at the top here: for 7 mm STW with the .284 | 150gr | 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.