Load Specifications
Load data in caliber 7 mm STW with .284 | 120gr | Barnes X S bullet and 73 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N560, Alliant Reloder-26 and Accurate MAGPRO.
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% | 59,828 psi | 90% | 3219 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 56,768 psi | 85% | 3209 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 57,885 psi | 87% | 3304 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 82% | 59,654 psi | 89% | 3212 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 56,565 psi | 85% | 3241 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 94% | 58,523 psi | 88% | 3304 fps | 98.1% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,156 psi | 80% | 3189 fps | 97.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 47,935 psi | 72% | 3150 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 88% | 60,191 psi | 90% | 3310 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 57,957 psi | 87% | 3271 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 59,959 psi | 90% | 3291 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 58,987 psi | 88% | 3307 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 60,162 psi | 90% | 3278 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 59,770 psi | 90% | 3337 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 90% | 57,232 psi | 86% | 3314 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 57,914 psi | 87% | 3284 fps | 98.9% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,188 psi | 84% | 3274 fps | 98.3% |
| Bofors RP5 | <<locked>> | 94% | 58,987 psi | 88% | 3307 fps | 99.1% |
| Bofors RP7 | <<locked>> | 84% | 58,059 psi | 87% | 3196 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 58,407 psi | 88% | 3284 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 84% | 57,493 psi | 86% | 3248 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 59,799 psi | 90% | 3258 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 58,363 psi | 87% | 3238 fps | 97.5% |
| Hodgdon H4831 SC | <<locked>> | 92% | 57,203 psi | 86% | 3219 fps | 97.3% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 57,072 psi | 86% | 3176 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 58,508 psi | 88% | 3409 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 58,407 psi | 88% | 3281 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 56% | 2106 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 59,698 psi | 89% | 3232 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 58,943 psi | 88% | 3215 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 56,666 psi | 85% | 3192 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 58,914 psi | 88% | 3219 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 96% | 60,205 psi | 90% | 3343 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 60,350 psi | 90% | 3219 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 58,711 psi | 88% | 3215 fps | 99.8% |
| Lovex S071 | <<locked>> | 98% | 57,406 psi | 86% | 3182 fps | 99.9% |
| Norma 204 | <<locked>> | 86% | 57,101 psi | 86% | 3225 fps | 98.6% |
| Norma 217ᴾ | <<locked>> | 100% | 44,048 psi | 66% | 3081 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 59,045 psi | 89% | 3330 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 58,131 psi | 87% | 3235 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 57,450 psi | 86% | 3301 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 86% | 56,898 psi | 85% | 3232 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 96% | 56,318 psi | 84% | 3232 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,130 psi | 57% | 2152 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 60,249 psi | 90% | 3278 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 58,262 psi | 87% | 3301 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 60,336 psi | 90% | 3412 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,448 psi | 83% | 3281 fps | 96.9% |
| Rottweil R 903 | <<locked>> | 82% | 59,872 psi | 90% | 3209 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 57,827 psi | 87% | 3212 fps | 98% |
| Rottweil R 905 | <<locked>> | 92% | 59,741 psi | 90% | 3281 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 58,059 psi | 87% | 3196 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 60,350 psi | 90% | 3219 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 58,711 psi | 88% | 3215 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 58,523 psi | 88% | 3064 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 59,611 psi | 89% | 3166 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 59,292 psi | 89% | 3274 fps | 99.1% |
| Somchem S355 | <<locked>> | 82% | 59,176 psi | 89% | 3199 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 59,843 psi | 90% | 3196 fps | 97.7% |
| Somchem S365 | <<locked>> | 88% | 59,074 psi | 89% | 3245 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,000 psi | 85% | 3196 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 82% | 56,695 psi | 85% | 3110 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 59,843 psi | 90% | 3225 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 60,075 psi | 90% | 3225 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 59,103 psi | 89% | 3228 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 59,103 psi | 89% | 3261 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 58,494 psi | 88% | 3317 fps | 97.7% |
| Vihtavuori N565 | <<locked>> | 98% | 59,248 psi | 89% | 3301 fps | 98.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,072 psi | 84% | 3287 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 59,480 psi | 89% | 3173 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 57,682 psi | 86% | 3251 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 96% | 58,827 psi | 88% | 3366 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 56,608 psi | 85% | 3182 fps | 98.7% |
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% | 38,116 psi | 57% | 2815 fps | 96.8% |
| Accurate 4350 | <<locked>> | 80% | 49,705 psi | 75% | 3087 fps | 99.9% |
| Accurate MAGPRO | 78.8 gr | 88% | 50,415 psi | 76% | 3166 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 56,043 psi | 84% | 3156 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 43,613 psi | 65% | 2992 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 47,935 psi | 72% | 3107 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 96% | 46,528 psi | 70% | 3061 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 92% | 37,260 psi | 56% | 2890 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 46,673 psi | 70% | 3084 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 54,027 psi | 81% | 3209 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 43,772 psi | 66% | 2986 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 84% | 42,598 psi | 64% | 2995 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 35,897 psi | 54% | 2835 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 33,591 psi | 50% | 2789 fps | 95.8% |
| Alliant Reloder-26 | 72.5 gr | 80% | 39,813 psi | 60% | 2986 fps | 98.7% |
| Bofors RP15 | <<locked>> | 86% | 42,221 psi | 63% | 2982 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 45,977 psi | 69% | 3084 fps | 95.9% |
| Bofors RP5 | <<locked>> | 84% | 42,598 psi | 64% | 2995 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 51,430 psi | 77% | 3081 fps | 98.5% |
| Hodgdon H1000 | <<locked>> | 92% | 44,628 psi | 67% | 3022 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 50,589 psi | 76% | 3127 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 52,562 psi | 79% | 3136 fps | 98.2% |
| Hodgdon H4831 | <<locked>> | 88% | 50,995 psi | 76% | 3110 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 50,227 psi | 75% | 3094 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 44,338 psi | 66% | 2959 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 39,726 psi | 60% | 3002 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 50,401 psi | 76% | 3140 fps | 98.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 42% | 1893 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 46,557 psi | 70% | 2999 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 52,257 psi | 78% | 3100 fps | 99% |
| IMR 4831 | <<locked>> | 80% | 46,949 psi | 70% | 3022 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 49,081 psi | 74% | 3041 fps | 95.6% |
| IMR 7828 SSC | <<locked>> | 88% | 46,282 psi | 69% | 3081 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 50,357 psi | 75% | 3054 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 48,921 psi | 73% | 3045 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 35,157 psi | 53% | 2740 fps | 95.7% |
| Norma 204 | <<locked>> | 80% | 46,876 psi | 70% | 3038 fps | 96.5% |
| Norma 217 | <<locked>> | 96% | 38,740 psi | 58% | 2953 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 38,972 psi | 58% | 2936 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 48,051 psi | 72% | 3064 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 46,383 psi | 70% | 3091 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 46,876 psi | 70% | 3051 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 86% | 39,291 psi | 59% | 2897 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,805 psi | 43% | 1939 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,327 psi | 74% | 3100 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,210 psi | 71% | 3110 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 36,869 psi | 55% | 2910 fps | 95.2% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 51,503 psi | 77% | 3212 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 56,376 psi | 85% | 3156 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 47,906 psi | 72% | 3031 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 40,640 psi | 61% | 2917 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 51,430 psi | 77% | 3081 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,357 psi | 75% | 3054 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 48,921 psi | 73% | 3045 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 55,303 psi | 83% | 3018 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,559 psi | 74% | 2999 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 43,033 psi | 65% | 2969 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 55,622 psi | 83% | 3146 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 49,298 psi | 74% | 3012 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 45,252 psi | 68% | 3022 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,394 psi | 62% | 2897 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 80% | 53,388 psi | 80% | 3061 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 49,356 psi | 74% | 3054 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 40,988 psi | 61% | 2877 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 80% | 49,066 psi | 74% | 3061 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 40,509 psi | 61% | 2927 fps | 99.2% |
| Vihtavuori N560 | 75.6 gr | 86% | 47,776 psi | 72% | 3120 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 92% | 48,646 psi | 73% | 3107 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 52,243 psi | 78% | 3219 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 48,486 psi | 73% | 3005 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 50,589 psi | 76% | 3127 fps | 98.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,532 psi | 49% | 2854 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 84% | 43,323 psi | 65% | 2936 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 73 powders for 7 mm STW loaded with the .284 | 120gr | Barnes X S. ReloadSwiss RS 76 delivers the highest muzzle velocity at 3,412 fps; across all powders the maximum-charge window runs from 2,106 fps to 3,412 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 120.0 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. Vihtavuori N560, Alliant Reloder-26, Accurate MAGPRO rank at the top here: for 7 mm STW with the .284 | 120gr | Barnes X S 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.