Load Specifications
Load data in caliber 7 mm STW with .284 | 133gr | MRR Green Hunting bullet and 74 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate MAGPRO, Alliant Reloder-26 and Hodgdon Retumbo.
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>> | 94% | 59,088 psi | 89% | 3097 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 59,785 psi | 90% | 3136 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,740 psi | 87% | 3189 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 82% | 59,727 psi | 90% | 3094 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 56,739 psi | 85% | 3133 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 58,711 psi | 88% | 3196 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 52,837 psi | 79% | 3087 fps | 98.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,543 psi | 71% | 3041 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 86% | 56,623 psi | 85% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,957 psi | 87% | 3146 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 60,147 psi | 90% | 3179 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,885 psi | 88% | 3192 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 60,292 psi | 90% | 3159 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 60,133 psi | 90% | 3222 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,072 psi | 86% | 3192 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 60,147 psi | 90% | 3150 fps | 96.8% |
| Bofors RP15 | <<locked>> | 96% | 58,015 psi | 87% | 3176 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,014 psi | 84% | 3163 fps | 98.9% |
| Bofors RP5 | <<locked>> | 94% | 58,885 psi | 88% | 3192 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 57,566 psi | 86% | 3077 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,711 psi | 88% | 3186 fps | 99.5% |
| Hodgdon H414 | <<locked>> | 84% | 57,508 psi | 86% | 3133 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 59,814 psi | 90% | 3146 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 58,291 psi | 87% | 3130 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,159 psi | 86% | 3110 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,087 psi | 86% | 3054 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,900 psi | 88% | 3304 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 58,392 psi | 88% | 3166 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,217 psi | 56% | 2011 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 59,727 psi | 90% | 3117 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 59,059 psi | 89% | 3100 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 59,988 psi | 90% | 3120 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 59,059 psi | 89% | 3114 fps | 98.5% |
| IMR 7828 SSC | <<locked>> | 94% | 56,637 psi | 85% | 3173 fps | 98.6% |
| Lovex S065 | <<locked>> | 86% | 59,814 psi | 90% | 3097 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,146 psi | 87% | 3094 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 60,075 psi | 90% | 3114 fps | 100% |
| Norma 204 | <<locked>> | 86% | 57,101 psi | 86% | 3117 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 43,323 psi | 65% | 2966 fps | 98.2% |
| Norma MRP | <<locked>> | 92% | 58,987 psi | 88% | 3212 fps | 100% |
| Norma URP | <<locked>> | 86% | 57,783 psi | 87% | 3114 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,725 psi | 87% | 3196 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 86% | 56,782 psi | 85% | 3114 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,434 psi | 85% | 3123 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,985 psi | 57% | 2054 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 59,988 psi | 90% | 3153 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,595 psi | 88% | 3186 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,115 psi | 84% | 3232 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,405 psi | 83% | 3176 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 82% | 59,190 psi | 89% | 3077 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,812 psi | 87% | 3100 fps | 98.7% |
| Rottweil R 905 | <<locked>> | 92% | 59,712 psi | 90% | 3169 fps | 99.6% |
| Rottweil R 907 | <<locked>> | 84% | 57,566 psi | 86% | 3077 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 59,814 psi | 90% | 3097 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,146 psi | 87% | 3094 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,508 psi | 88% | 2943 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,393 psi | 89% | 3051 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 59,263 psi | 89% | 3163 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 58,697 psi | 88% | 3074 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 59,654 psi | 89% | 3087 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 58,856 psi | 88% | 3117 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 60,234 psi | 90% | 3136 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 84% | 60,133 psi | 90% | 3038 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 59,654 psi | 89% | 3104 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 59,973 psi | 90% | 3114 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 58,972 psi | 88% | 3110 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 58,537 psi | 88% | 3136 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,566 psi | 88% | 3205 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 58,929 psi | 88% | 3182 fps | 98.8% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 55,985 psi | 84% | 3179 fps | 97.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,451 psi | 89% | 3054 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,508 psi | 86% | 3133 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 59,335 psi | 89% | 3245 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,362 psi | 84% | 3071 fps | 99.3% |
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% | 36,434 psi | 55% | 2680 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 48,573 psi | 73% | 2956 fps | 100% |
| Accurate MAGPRO | 76.1 gr | 86% | 46,557 psi | 70% | 2986 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 55,912 psi | 84% | 3035 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 40,292 psi | 60% | 2815 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 44,469 psi | 67% | 2933 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 94% | 43,047 psi | 65% | 2890 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 90% | 33,910 psi | 51% | 2710 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,427 psi | 70% | 2966 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,041 psi | 81% | 3091 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 40,422 psi | 61% | 2812 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 38,943 psi | 58% | 2808 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,041 psi | 53% | 2713 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 30,298 psi | 45% | 2602 fps | 95.2% |
| Alliant Reloder-26 | 71.6 gr | 80% | 38,870 psi | 58% | 2858 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 52,997 psi | 79% | 3025 fps | 95.1% |
| Bofors RP15 | <<locked>> | 84% | 38,769 psi | 58% | 2802 fps | 95.1% |
| Bofors RP30 | <<locked>> | 92% | 42,351 psi | 63% | 2904 fps | 95.8% |
| Bofors RP5 | <<locked>> | 82% | 38,943 psi | 58% | 2808 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 50,807 psi | 76% | 2963 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 41,191 psi | 62% | 2854 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,067 psi | 75% | 3005 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 52,431 psi | 79% | 3022 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 86% | 47,398 psi | 71% | 2936 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 86% | 46,601 psi | 70% | 2923 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 43,671 psi | 65% | 2838 fps | 100% |
| Hodgdon Retumbo | 73.7 gr | 88% | 38,943 psi | 58% | 2890 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,212 psi | 75% | 3028 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,731 psi | 42% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,064 psi | 69% | 2884 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,069 psi | 78% | 2986 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 46,122 psi | 69% | 2897 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 45,774 psi | 69% | 2877 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 42,772 psi | 64% | 2907 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 49,748 psi | 75% | 2936 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 48,109 psi | 72% | 2923 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 31,299 psi | 47% | 2549 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 46,543 psi | 70% | 2927 fps | 97.4% |
| Norma 217 | <<locked>> | 94% | 35,143 psi | 53% | 2766 fps | 95.2% |
| Norma MRP | <<locked>> | 80% | 38,203 psi | 57% | 2815 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 47,442 psi | 71% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 42,801 psi | 64% | 2917 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,441 psi | 70% | 2936 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 84% | 35,578 psi | 53% | 2713 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,471 psi | 43% | 1844 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 48,689 psi | 73% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 46,804 psi | 70% | 2992 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 35,723 psi | 54% | 2795 fps | 96.1% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 47,297 psi | 71% | 3028 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 55,535 psi | 83% | 3025 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 41,698 psi | 63% | 2799 fps | 95% |
| Rottweil R 905 | <<locked>> | 80% | 39,798 psi | 60% | 2795 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 50,807 psi | 76% | 2963 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 49,748 psi | 75% | 2936 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 48,109 psi | 72% | 2923 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 54,955 psi | 82% | 2897 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 48,588 psi | 73% | 2877 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 39,465 psi | 59% | 2792 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 55,172 psi | 83% | 3018 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 45,513 psi | 68% | 2844 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 44,527 psi | 67% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 40,379 psi | 61% | 2779 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 52,837 psi | 79% | 2936 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 48,834 psi | 73% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 37,565 psi | 56% | 2703 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 48,399 psi | 73% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 39,218 psi | 59% | 2792 fps | 99.4% |
| Vihtavuori N560 | <<locked>> | 84% | 44,222 psi | 66% | 2940 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 90% | 44,715 psi | 67% | 2927 fps | 95.6% |
| Vihtavuori N568 | <<locked>> | 96% | 48,327 psi | 72% | 3038 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,298 psi | 72% | 2890 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,285 psi | 75% | 3009 fps | 99.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 31,328 psi | 47% | 2723 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 39,653 psi | 59% | 2759 fps | 95.6% |
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 74 powders for 7 mm STW loaded with the .284 | 133gr | MRR Green Hunting. Hodgdon Retumbo delivers the highest muzzle velocity at 3,304 fps; across all powders the maximum-charge window runs from 2,011 fps to 3,304 fps. ADI AR 2217 gives the best case fill at 100 %, and 74 of the 74 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 133.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-25 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. Accurate MAGPRO, Alliant Reloder-26, Hodgdon Retumbo rank at the top here: for 7 mm STW with the .284 | 133gr | MRR Green Hunting 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.