Load Specifications
Load data in caliber 7 mm STW with .284 | 140gr | Sierra Pro-Hunter bullet and 70 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 Vihtavuori N560.
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% | 57,841 psi | 87% | 3018 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,494 psi | 88% | 3051 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,695 psi | 85% | 3114 fps | 98.2% |
| ADI AR 2209 | <<locked>> | 90% | 59,408 psi | 89% | 3114 fps | 99.7% |
| ADI AR 2213 | <<locked>> | 92% | 57,421 psi | 86% | 3117 fps | 99.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,738 psi | 84% | 3077 fps | 99.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,343 psi | 75% | 3035 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 86% | 59,422 psi | 89% | 3107 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 58,842 psi | 88% | 3097 fps | 99.7% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,725 psi | 87% | 3110 fps | 99.7% |
| Alliant Reloder-23 | <<locked>> | 94% | 59,393 psi | 89% | 3077 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 59,335 psi | 89% | 3143 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,217 psi | 84% | 3114 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,624 psi | 88% | 3071 fps | 97.1% |
| Bofors RP15 | <<locked>> | 94% | 56,869 psi | 85% | 3094 fps | 99.6% |
| Bofors RP30ᴾ | <<locked>> | 100% | 59,074 psi | 89% | 3150 fps | 99.6% |
| Bofors RP5 | <<locked>> | 92% | 57,725 psi | 87% | 3110 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 59,872 psi | 90% | 3048 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,377 psi | 86% | 3104 fps | 99.6% |
| Hodgdon H414 | <<locked>> | 84% | 59,886 psi | 90% | 3104 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,189 psi | 87% | 3058 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 90% | 56,956 psi | 85% | 3048 fps | 98.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 59,756 psi | 90% | 3094 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 59,495 psi | 89% | 3022 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,204 psi | 87% | 3225 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,942 psi | 85% | 3081 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,362 psi | 56% | 1969 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,276 psi | 87% | 3035 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,537 psi | 86% | 3018 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,697 psi | 88% | 3038 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,566 psi | 86% | 3031 fps | 98.7% |
| IMR 7828 SSC | <<locked>> | 94% | 59,582 psi | 89% | 3156 fps | 99.3% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,745 psi | 69% | 2933 fps | 97.3% |
| Lovex S065 | <<locked>> | 84% | 58,334 psi | 87% | 3012 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,768 psi | 85% | 3009 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 59,234 psi | 89% | 3038 fps | 100% |
| Norma 204 | <<locked>> | 86% | 59,669 psi | 89% | 3091 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 46,195 psi | 69% | 2959 fps | 99.2% |
| Norma MRP | <<locked>> | 90% | 57,914 psi | 87% | 3133 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,492 psi | 85% | 3028 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,637 psi | 85% | 3117 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 86% | 59,364 psi | 89% | 3087 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 59,582 psi | 89% | 3107 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,145 psi | 57% | 2011 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,552 psi | 88% | 3068 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,246 psi | 86% | 3097 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 59,654 psi | 89% | 3219 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,972 psi | 88% | 3173 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 90% | 60,046 psi | 90% | 3077 fps | 99.3% |
| Rottweil R 905 | <<locked>> | 90% | 58,407 psi | 88% | 3087 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 59,872 psi | 90% | 3048 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,334 psi | 87% | 3012 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,768 psi | 85% | 3009 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,537 psi | 86% | 2966 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,972 psi | 87% | 3081 fps | 99.7% |
| Somchem S361 | <<locked>> | 88% | 58,030 psi | 87% | 3005 fps | 98.6% |
| Somchem S365 | <<locked>> | 86% | 57,711 psi | 87% | 3035 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 58,914 psi | 88% | 3054 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,407 psi | 88% | 2953 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,262 psi | 87% | 3022 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,856 psi | 88% | 3038 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 57,479 psi | 86% | 3022 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,435 psi | 86% | 3054 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,479 psi | 86% | 3130 fps | 98.8% |
| Vihtavuori N565 | <<locked>> | 96% | 57,885 psi | 87% | 3107 fps | 99% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 59,379 psi | 89% | 3173 fps | 98.4% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,841 psi | 87% | 2966 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 60,118 psi | 90% | 3107 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,668 psi | 88% | 3163 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 58,972 psi | 88% | 3051 fps | 99.7% |
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% | 38,319 psi | 57% | 2671 fps | 98.2% |
| Accurate 4350 | <<locked>> | 80% | 50,894 psi | 76% | 2933 fps | 100% |
| Accurate MAGPRO | <<locked>> | 84% | 45,629 psi | 68% | 2910 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 42,366 psi | 64% | 2805 fps | 97% |
| ADI AR 2213 | <<locked>> | 82% | 40,480 psi | 61% | 2789 fps | 95% |
| ADI AR 2217 | <<locked>> | 90% | 39,508 psi | 59% | 2759 fps | 95% |
| ADI AR 2225 | <<locked>> | 88% | 33,417 psi | 50% | 2648 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,675 psi | 73% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,308 psi | 63% | 2799 fps | 97% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,174 psi | 57% | 2733 fps | 95.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,999 psi | 55% | 2697 fps | 99.9% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,024 psi | 48% | 2605 fps | 96.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,408 psi | 62% | 2851 fps | 99.7% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 51,576 psi | 77% | 2949 fps | 95.4% |
| Bofors RP15 | <<locked>> | 82% | 38,029 psi | 57% | 2726 fps | 95.5% |
| Bofors RP30 | <<locked>> | 88% | 38,914 psi | 58% | 2769 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 38,174 psi | 57% | 2733 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 52,721 psi | 79% | 2936 fps | 99.6% |
| Hodgdon H1000 | <<locked>> | 86% | 37,666 psi | 56% | 2717 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 52,431 psi | 79% | 2986 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 80% | 54,491 psi | 82% | 2999 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 82% | 43,250 psi | 65% | 2799 fps | 95.3% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,409 psi | 64% | 2779 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,730 psi | 69% | 2812 fps | 100% |
| Hodgdon Retumbo | 70.9 gr | 84% | 35,824 psi | 54% | 2753 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 52,779 psi | 79% | 3015 fps | 99.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 42% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,124 psi | 72% | 2864 fps | 99.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,940 psi | 81% | 2959 fps | 99.8% |
| IMR 4831 | <<locked>> | 80% | 48,211 psi | 72% | 2877 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,872 psi | 63% | 2740 fps | 95.1% |
| IMR 7828 SSC | <<locked>> | 84% | 41,989 psi | 63% | 2835 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,813 psi | 60% | 2805 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 51,677 psi | 77% | 2907 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,038 psi | 75% | 2900 fps | 99.6% |
| Lovex S071 | <<locked>> | 80% | 32,996 psi | 49% | 2543 fps | 96.5% |
| Norma 204 | <<locked>> | 80% | 48,544 psi | 73% | 2907 fps | 98.3% |
| Norma 217 | <<locked>> | 92% | 34,795 psi | 52% | 2703 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 40,321 psi | 60% | 2808 fps | 97.8% |
| Norma URP | <<locked>> | 80% | 49,588 psi | 74% | 2920 fps | 100% |
| Ramshot Grand | <<locked>> | 84% | 41,872 psi | 63% | 2841 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 48,515 psi | 73% | 2913 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 34,882 psi | 52% | 2644 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,689 psi | 43% | 1808 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,010 psi | 76% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,371 psi | 74% | 2972 fps | 100% |
| ReloadSwiss RS 76 | 74 gr | 82% | 32,619 psi | 49% | 2654 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,091 psi | 65% | 2884 fps | 95% |
| Rottweil R 904 | <<locked>> | 80% | 43,468 psi | 65% | 2782 fps | 96.2% |
| Rottweil R 905 | <<locked>> | 80% | 41,727 psi | 63% | 2782 fps | 97% |
| Rottweil R 907 | <<locked>> | 80% | 52,721 psi | 79% | 2936 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,677 psi | 77% | 2907 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,038 psi | 75% | 2900 fps | 99.6% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,633 psi | 76% | 2854 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,379 psi | 62% | 2779 fps | 96.9% |
| Somchem S361 | <<locked>> | 80% | 44,382 psi | 67% | 2766 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 47,021 psi | 70% | 2874 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,235 psi | 63% | 2762 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 54,868 psi | 82% | 2904 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,966 psi | 76% | 2910 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,738 psi | 55% | 2631 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 50,459 psi | 76% | 2913 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,278 psi | 62% | 2779 fps | 99.9% |
| Vihtavuori N560 | 71.8 gr | 82% | 43,323 psi | 65% | 2864 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 86% | 41,002 psi | 61% | 2792 fps | 95% |
| Vihtavuori N568 | <<locked>> | 94% | 47,645 psi | 71% | 2969 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,328 psi | 75% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,431 psi | 79% | 2986 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,794 psi | 51% | 2723 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,870 psi | 58% | 2687 fps | 96% |
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 76 powders for 7 mm STW loaded with the .284 | 140gr | Sierra Pro-Hunter. Hodgdon Retumbo delivers the highest muzzle velocity at 3,225 fps; across all powders the maximum-charge window runs from 1,969 fps to 3,225 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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 140.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, Vihtavuori N560 rank at the top here: for 7 mm STW with the .284 | 140gr | Sierra Pro-Hunter they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, ADI AR 2218, Alliant Reloder-50, IMR 7977 Enduron 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.