Load Specifications
Load data in caliber 7 mm STW with .284 | 120gr | Prvi Partizan HP bullet and 77 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, IMR 7828 SSC and Norma MRP.
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>> | 96% | 59,988 psi | 90% | 3232 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,840 psi | 85% | 3219 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 58,958 psi | 88% | 3327 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 82% | 57,392 psi | 86% | 3189 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,928 psi | 87% | 3271 fps | 98.9% |
| ADI AR 2213 | <<locked>> | 96% | 59,872 psi | 90% | 3337 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 50,285 psi | 75% | 3143 fps | 96.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 45,005 psi | 67% | 3094 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 58,900 psi | 88% | 3212 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,711 psi | 87% | 3284 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 59,146 psi | 89% | 3297 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,334 psi | 86% | 3258 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 96% | 59,886 psi | 90% | 3330 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 57,203 psi | 86% | 3245 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,869 psi | 85% | 3301 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 58,160 psi | 87% | 3333 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 58,682 psi | 88% | 3307 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 60,336 psi | 90% | 3232 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,692 psi | 79% | 3222 fps | 97.7% |
| Bofors RP5 | <<locked>> | 96% | 59,886 psi | 90% | 3330 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 59,045 psi | 89% | 3225 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 55,724 psi | 84% | 3251 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 82% | 60,162 psi | 90% | 3251 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 58,566 psi | 88% | 3271 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 84% | 57,319 psi | 86% | 3228 fps | 99% |
| Hodgdon H4831 | <<locked>> | 94% | 59,640 psi | 89% | 3268 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 58,450 psi | 88% | 3248 fps | 97.5% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,928 psi | 87% | 3196 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,637 psi | 83% | 3369 fps | 99.5% |
| Hodgdon Superformance | <<locked>> | 86% | 59,973 psi | 90% | 3310 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 55% | 2110 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,130 psi | 86% | 3199 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,869 psi | 85% | 3192 fps | 99.5% |
| IMR 4831 | <<locked>> | 88% | 57,101 psi | 86% | 3209 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 60,321 psi | 90% | 3251 fps | 98% |
| IMR 7828 SSC | <<locked>> | 96% | 57,624 psi | 86% | 3307 fps | 98.1% |
| Lovex S065 | <<locked>> | 86% | 57,450 psi | 86% | 3186 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 59,379 psi | 89% | 3238 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,159 psi | 86% | 3189 fps | 99.9% |
| Norma 204 | <<locked>> | 88% | 58,610 psi | 88% | 3261 fps | 98.9% |
| Norma 217ᴾ | <<locked>> | 100% | 40,466 psi | 61% | 3002 fps | 96.3% |
| Norma MRP | <<locked>> | 94% | 60,075 psi | 90% | 3353 fps | 99.8% |
| Norma URP | <<locked>> | 88% | 58,929 psi | 88% | 3258 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 58,755 psi | 88% | 3330 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 88% | 58,088 psi | 87% | 3261 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 98% | 57,551 psi | 86% | 3258 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,695 psi | 56% | 2156 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 59,814 psi | 90% | 3232 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 58,566 psi | 88% | 3287 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,058 psi | 86% | 3238 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 59,712 psi | 90% | 3330 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 57,101 psi | 86% | 3366 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 56,768 psi | 85% | 3173 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 58,914 psi | 88% | 3238 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 56,826 psi | 85% | 3245 fps | 98.9% |
| Rottweil R 907 | <<locked>> | 86% | 59,045 psi | 89% | 3225 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,450 psi | 86% | 3186 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 59,379 psi | 89% | 3238 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 58,363 psi | 87% | 3232 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 59,785 psi | 90% | 3091 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,971 psi | 85% | 3136 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 60,365 psi | 90% | 3304 fps | 99.3% |
| Somchem S355 | <<locked>> | 84% | 59,988 psi | 90% | 3222 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 57,130 psi | 86% | 3163 fps | 97.3% |
| Somchem S365 | <<locked>> | 90% | 59,683 psi | 89% | 3261 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,551 psi | 86% | 3215 fps | 99.4% |
| Vihtavuori N150 | <<locked>> | 84% | 57,754 psi | 87% | 3136 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,913 psi | 85% | 3192 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 57,130 psi | 86% | 3192 fps | 99.2% |
| Vihtavuori N550 | <<locked>> | 88% | 60,263 psi | 90% | 3255 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 59,408 psi | 89% | 3278 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 59,669 psi | 89% | 3343 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 59,770 psi | 90% | 3314 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,927 psi | 85% | 3143 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 58,798 psi | 88% | 3278 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 60,017 psi | 90% | 3389 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,841 psi | 87% | 3212 fps | 98.9% |
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% | 34,360 psi | 52% | 2733 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 46,064 psi | 69% | 3031 fps | 99.6% |
| Accurate MAGPRO | <<locked>> | 90% | 51,010 psi | 76% | 3186 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 53,780 psi | 81% | 3130 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 43,976 psi | 66% | 3009 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 90% | 48,617 psi | 73% | 3133 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 98% | 46,862 psi | 70% | 3077 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 94% | 36,825 psi | 55% | 2887 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 55,201 psi | 83% | 3156 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,048 psi | 66% | 3041 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,300 psi | 77% | 3173 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 43,947 psi | 66% | 2999 fps | 95.9% |
| Alliant Reloder-22 | <<locked>> | 86% | 42,351 psi | 63% | 2995 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,880 psi | 49% | 2766 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 32,837 psi | 49% | 2779 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,318 psi | 54% | 2904 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 41,959 psi | 63% | 2982 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 56,463 psi | 85% | 3173 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 45,788 psi | 69% | 3087 fps | 95.8% |
| Bofors RP5 | <<locked>> | 86% | 42,351 psi | 63% | 2995 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 48,733 psi | 73% | 3041 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 44,918 psi | 67% | 3038 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 56,362 psi | 84% | 3192 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 47,761 psi | 72% | 3081 fps | 98.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,270 psi | 75% | 3104 fps | 97.8% |
| Hodgdon H4831 | <<locked>> | 88% | 48,385 psi | 73% | 3068 fps | 95.2% |
| Hodgdon H4831 SC | <<locked>> | 90% | 50,966 psi | 76% | 3117 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,510 psi | 62% | 2913 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 42,221 psi | 63% | 3077 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 47,674 psi | 71% | 3100 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,572 psi | 41% | 1893 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,193 psi | 66% | 2959 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,995 psi | 75% | 3068 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 43,845 psi | 66% | 2972 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 49,705 psi | 75% | 3064 fps | 95.8% |
| IMR 7828 SSC | 76.9 gr | 90% | 46,717 psi | 70% | 3100 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,500 psi | 71% | 3015 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 45,992 psi | 69% | 2999 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 33,678 psi | 50% | 2717 fps | 95.1% |
| Norma 204 | <<locked>> | 80% | 44,222 psi | 66% | 2992 fps | 95.8% |
| Norma 217 | <<locked>> | 98% | 37,826 psi | 57% | 2936 fps | 95.2% |
| Norma MRP | 72.8 gr | 82% | 38,783 psi | 58% | 2940 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 45,179 psi | 68% | 3018 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 46,818 psi | 70% | 3110 fps | 95.9% |
| Ramshot Hunter | <<locked>> | 80% | 44,063 psi | 66% | 3002 fps | 98.3% |
| Ramshot Magnum | <<locked>> | 88% | 39,015 psi | 58% | 2900 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,253 psi | 42% | 1939 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 56,086 psi | 84% | 3173 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 54,563 psi | 82% | 3228 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,209 psi | 69% | 3051 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,483 psi | 67% | 3064 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 39,218 psi | 59% | 2982 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 80% | 53,055 psi | 80% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 45,353 psi | 68% | 2986 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 43,352 psi | 65% | 2989 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 48,733 psi | 73% | 3041 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,500 psi | 71% | 3015 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 45,992 psi | 69% | 2999 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,476 psi | 82% | 3169 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,794 psi | 79% | 2992 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,717 psi | 70% | 2956 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 42,975 psi | 64% | 2979 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 52,663 psi | 79% | 3107 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 49,937 psi | 75% | 3035 fps | 95.7% |
| Somchem S365 | <<locked>> | 80% | 42,221 psi | 63% | 2972 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,435 psi | 58% | 2841 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 50,589 psi | 76% | 3028 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,543 psi | 70% | 3015 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 40,727 psi | 61% | 2881 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,064 psi | 69% | 3015 fps | 99.5% |
| Vihtavuori N555 | <<locked>> | 80% | 36,985 psi | 55% | 2854 fps | 98.4% |
| Vihtavuori N560 | <<locked>> | 88% | 48,240 psi | 72% | 3136 fps | 95.3% |
| Vihtavuori N565 | <<locked>> | 94% | 48,486 psi | 73% | 3114 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,977 psi | 69% | 2969 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,964 psi | 72% | 3087 fps | 98.4% |
| Winchester StaBALL HD | 70.2 gr | 80% | 29,356 psi | 44% | 2756 fps | 98.2% |
| Winchester Supreme 780 | <<locked>> | 86% | 43,439 psi | 65% | 2949 fps | 95.8% |
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 77 powders for 7 mm STW loaded with the .284 | 120gr | Prvi Partizan HP. Winchester StaBALL HD delivers the highest muzzle velocity at 3,389 fps; across all powders the maximum-charge window runs from 2,110 fps to 3,389 fps. ADI AR 2217 gives the best case fill at 100 %, and 77 of the 77 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 120.0 gr projectile in 0.284" calls for a 1:13.0 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. Winchester StaBALL HD, IMR 7828 SSC, Norma MRP rank at the top here: for 7 mm STW with the .284 | 120gr | Prvi Partizan HP 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.