Load Specifications
Load data in caliber 7 mm STW with .284 | 127gr | Geco ZERO LG bullet and 85 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and ADI AR 2213.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 84% | 57,261 psi | 86% | 3071 fps | 99.3% |
| Accurate 3100 | <<locked>> | 96% | 56,507 psi | 85% | 3117 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 59,074 psi | 89% | 3094 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 57,667 psi | 86% | 3166 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,246 psi | 84% | 3209 fps | 96.3% |
| ADI AR 2208 | <<locked>> | 84% | 58,740 psi | 88% | 3133 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 59,059 psi | 89% | 3222 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 56,739 psi | 85% | 3219 fps | 98% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,355 psi | 71% | 3025 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,076 psi | 63% | 2969 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 60,118 psi | 90% | 3156 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 82% | 60,162 psi | 90% | 3182 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 58,697 psi | 88% | 3228 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 60,234 psi | 90% | 3245 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 58,378 psi | 88% | 3205 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 96% | 56,521 psi | 85% | 3209 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 57,653 psi | 86% | 3186 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,243 psi | 80% | 3179 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 58,639 psi | 88% | 3278 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 59,321 psi | 89% | 3251 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 57,421 psi | 86% | 3117 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,298 psi | 74% | 3100 fps | 97.1% |
| Bofors RP5 | <<locked>> | 96% | 56,521 psi | 85% | 3209 fps | 99% |
| Bofors RP7 | <<locked>> | 88% | 60,278 psi | 90% | 3169 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,533 psi | 79% | 3130 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 82% | 57,551 psi | 86% | 3140 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 59,698 psi | 89% | 3222 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 58,523 psi | 88% | 3179 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 56,724 psi | 85% | 3153 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 59,509 psi | 89% | 3196 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 58,987 psi | 88% | 3140 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,214 psi | 78% | 3241 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 86% | 56,797 psi | 85% | 3199 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,593 psi | 55% | 2028 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 58,131 psi | 87% | 3117 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 58,349 psi | 87% | 3150 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 58,233 psi | 87% | 3140 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 58,015 psi | 87% | 3153 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 57,725 psi | 87% | 3140 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 98% | 58,363 psi | 87% | 3255 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 58,334 psi | 87% | 3107 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 58,697 psi | 88% | 3136 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 56,652 psi | 85% | 3127 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,577 psi | 80% | 3071 fps | 99.8% |
| Norma 203B | <<locked>> | 82% | 59,451 psi | 89% | 3166 fps | 100% |
| Norma 204 | <<locked>> | 90% | 59,698 psi | 89% | 3209 fps | 99.1% |
| Norma MRP | <<locked>> | 94% | 56,347 psi | 84% | 3232 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 59,915 psi | 90% | 3202 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 59,553 psi | 89% | 3278 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 90% | 58,929 psi | 88% | 3205 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 58,030 psi | 87% | 3202 fps | 99.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,463 psi | 56% | 2077 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 57,290 psi | 86% | 3123 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 59,959 psi | 90% | 3235 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 57,841 psi | 87% | 3186 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 56,579 psi | 85% | 3215 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,345 psi | 80% | 3238 fps | 99.8% |
| Rottweil R 902 | <<locked>> | 82% | 60,031 psi | 90% | 3117 fps | 100% |
| Rottweil R 903 | <<locked>> | 84% | 57,754 psi | 87% | 3117 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 60,075 psi | 90% | 3186 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 94% | 57,740 psi | 87% | 3192 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 88% | 60,278 psi | 90% | 3169 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 58,697 psi | 88% | 3136 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 58,334 psi | 87% | 3107 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 56,652 psi | 85% | 3127 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 59,698 psi | 89% | 3179 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 57,595 psi | 86% | 2989 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 58,015 psi | 87% | 3081 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 57,276 psi | 86% | 3189 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 57,246 psi | 86% | 3110 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 58,363 psi | 87% | 3117 fps | 97.6% |
| Somchem S365 | <<locked>> | 90% | 56,463 psi | 85% | 3150 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 58,276 psi | 87% | 3163 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 86% | 58,755 psi | 88% | 3081 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 58,073 psi | 87% | 3140 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 58,059 psi | 87% | 3140 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 59,321 psi | 89% | 3077 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 57,203 psi | 86% | 3143 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 59,799 psi | 90% | 3219 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 56,231 psi | 84% | 3222 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 56,217 psi | 84% | 3196 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 58,030 psi | 87% | 3091 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 59,944 psi | 90% | 3225 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 60,089 psi | 90% | 3330 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 58,653 psi | 88% | 3159 fps | 99.1% |
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 2700 | <<locked>> | 80% | 50,096 psi | 75% | 2953 fps | 98.4% |
| Accurate 3100 | <<locked>> | 82% | 34,316 psi | 51% | 2680 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 55,245 psi | 83% | 3041 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 43,337 psi | 65% | 2917 fps | 99.4% |
| Accurate MAGPRO | <<locked>> | 94% | 52,257 psi | 78% | 3136 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 51,706 psi | 78% | 3025 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 41,727 psi | 63% | 2897 fps | 95.4% |
| ADI AR 2213 | 72.8 gr | 90% | 45,992 psi | 69% | 3012 fps | 95.3% |
| ADI AR 2217 | <<locked>> | 98% | 44,135 psi | 66% | 2956 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 96% | 36,709 psi | 55% | 2831 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 52,692 psi | 79% | 3048 fps | 100% |
| Alliant Reloder-15 | <<locked>> | 80% | 56,333 psi | 84% | 3127 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 41,684 psi | 62% | 2927 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,414 psi | 73% | 3061 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 41,698 psi | 63% | 2890 fps | 95.4% |
| Alliant Reloder-22 | <<locked>> | 88% | 42,627 psi | 64% | 2946 fps | 95.9% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,763 psi | 46% | 2654 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,924 psi | 49% | 2730 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,707 psi | 51% | 2782 fps | 96.9% |
| Bofors RP15 | <<locked>> | 90% | 42,221 psi | 63% | 2936 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 53,621 psi | 80% | 3061 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 42,656 psi | 64% | 2966 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 42,627 psi | 64% | 2946 fps | 95.9% |
| Bofors RP7 | <<locked>> | 80% | 46,456 psi | 70% | 2930 fps | 97.8% |
| Hodgdon H1000 | <<locked>> | 94% | 42,279 psi | 63% | 2920 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 53,838 psi | 81% | 3081 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 45,411 psi | 68% | 2972 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 48,008 psi | 72% | 2992 fps | 97.5% |
| Hodgdon H4831 | <<locked>> | 90% | 49,153 psi | 74% | 3018 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 48,327 psi | 72% | 3005 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,204 psi | 59% | 2805 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 92% | 39,552 psi | 59% | 2953 fps | 95.4% |
| Hodgdon Superformance | <<locked>> | 80% | 44,933 psi | 67% | 2986 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,441 psi | 41% | 1824 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 54,404 psi | 82% | 3061 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,989 psi | 63% | 2851 fps | 96.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,950 psi | 72% | 2963 fps | 98.4% |
| IMR 4831 | <<locked>> | 80% | 41,423 psi | 62% | 2864 fps | 99.2% |
| IMR 4955 Enduron | <<locked>> | 88% | 47,456 psi | 71% | 2956 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 47,210 psi | 71% | 3051 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 54,636 psi | 82% | 3051 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 45,368 psi | 68% | 2907 fps | 99% |
| Lovex S070 | <<locked>> | 80% | 43,656 psi | 65% | 2887 fps | 97.8% |
| Lovex S071 | <<locked>> | 86% | 33,373 psi | 50% | 2657 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 55,695 psi | 83% | 3110 fps | 100% |
| Norma 204 | <<locked>> | 80% | 42,061 psi | 63% | 2884 fps | 95.3% |
| Norma MRP | 68.4 gr | 82% | 36,114 psi | 54% | 2818 fps | 95% |
| Norma URP | <<locked>> | 80% | 42,786 psi | 64% | 2907 fps | 99.3% |
| Ramshot Grand | <<locked>> | 90% | 43,961 psi | 66% | 2989 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 41,785 psi | 63% | 2897 fps | 97.9% |
| Ramshot Magnum | <<locked>> | 90% | 39,247 psi | 59% | 2854 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,949 psi | 42% | 1867 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 53,693 psi | 80% | 3061 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 51,488 psi | 77% | 3114 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,381 psi | 65% | 2933 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 41,989 psi | 63% | 2953 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 36,448 psi | 55% | 2858 fps | 95.4% |
| Rottweil R 902 | <<locked>> | 80% | 56,434 psi | 85% | 3064 fps | 100% |
| Rottweil R 903 | <<locked>> | 80% | 50,401 psi | 76% | 3005 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 46,137 psi | 69% | 2943 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 40,901 psi | 61% | 2874 fps | 95.3% |
| Rottweil R 907 | <<locked>> | 80% | 46,456 psi | 70% | 2930 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,368 psi | 68% | 2907 fps | 99% |
| Shooters World Precision | <<locked>> | 80% | 54,636 psi | 82% | 3051 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 43,656 psi | 65% | 2887 fps | 97.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 52,083 psi | 78% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,778 psi | 76% | 2894 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,382 psi | 67% | 2844 fps | 97.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 40,538 psi | 61% | 2867 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 50,328 psi | 75% | 3002 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 47,471 psi | 71% | 2927 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 39,479 psi | 59% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 38,667 psi | 58% | 2789 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 48,254 psi | 72% | 2923 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,251 psi | 66% | 2907 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 38,392 psi | 58% | 2772 fps | 95.1% |
| Vihtavuori N540 | <<locked>> | 80% | 55,622 psi | 83% | 3025 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 43,685 psi | 65% | 2904 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 34,389 psi | 52% | 2736 fps | 97.9% |
| Vihtavuori N560 | 75.1 gr | 90% | 48,747 psi | 73% | 3084 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 94% | 45,223 psi | 68% | 2989 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,656 psi | 65% | 2867 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,411 psi | 68% | 2972 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 27,267 psi | 41% | 2635 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 86% | 41,017 psi | 61% | 2838 fps | 95.3% |
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 85 powders for 7 mm STW loaded with the .284 | 127gr | Geco ZERO LG. Winchester StaBALL HD delivers the highest muzzle velocity at 3,330 fps; across all powders the maximum-charge window runs from 2,028 fps to 3,330 fps. ADI AR 2217 gives the best case fill at 100 %, and 85 of the 85 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 127.0 gr projectile in 0.284" calls for a 1:9.0 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. Norma MRP, Vihtavuori N560, ADI AR 2213 rank at the top here: for 7 mm STW with the .284 | 127gr | Geco ZERO LG 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.