Load Specifications
Load data in caliber 7 mm STW with .284 | 139gr | Hornady InterLock FP bullet and 74 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 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>> | 92% | 59,205 psi | 89% | 3045 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 59,698 psi | 89% | 3077 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 56,913 psi | 85% | 3140 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 90% | 58,001 psi | 87% | 3143 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 88% | 56,652 psi | 85% | 3077 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 58,798 psi | 88% | 3146 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 57,130 psi | 86% | 3107 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 51,648 psi | 77% | 3064 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 56,840 psi | 85% | 3074 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 84% | 56,681 psi | 85% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 60,176 psi | 90% | 3127 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 59,045 psi | 89% | 3140 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 92% | 56,913 psi | 85% | 3054 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 56,942 psi | 85% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 57,725 psi | 87% | 3140 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 54,810 psi | 82% | 3120 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 59,756 psi | 90% | 3100 fps | 97.4% |
| Bofors RP15 | <<locked>> | 94% | 58,189 psi | 87% | 3123 fps | 99.7% |
| Bofors RP30 | <<locked>> | 98% | 56,623 psi | 85% | 3117 fps | 99.3% |
| Bofors RP5 | <<locked>> | 92% | 59,045 psi | 89% | 3140 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 57,159 psi | 86% | 3018 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 59,001 psi | 88% | 3140 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 82% | 57,116 psi | 86% | 3071 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 59,451 psi | 89% | 3091 fps | 99.8% |
| Hodgdon H4831 | <<locked>> | 90% | 58,204 psi | 87% | 3077 fps | 98.7% |
| Hodgdon H4831 SC | <<locked>> | 90% | 57,101 psi | 86% | 3061 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 56,942 psi | 85% | 2999 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 59,785 psi | 90% | 3261 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 58,117 psi | 87% | 3107 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,434 psi | 56% | 1985 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 59,248 psi | 89% | 3058 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 58,349 psi | 87% | 3038 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 59,727 psi | 90% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 58,581 psi | 88% | 3058 fps | 98.9% |
| IMR 7828 SSC | <<locked>> | 92% | 56,869 psi | 85% | 3123 fps | 99.1% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 47,123 psi | 71% | 2966 fps | 97.7% |
| Lovex S065 | <<locked>> | 84% | 59,379 psi | 89% | 3038 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 57,812 psi | 87% | 3038 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 56,681 psi | 85% | 3012 fps | 100% |
| Norma 204 | <<locked>> | 84% | 56,956 psi | 85% | 3061 fps | 99.5% |
| Norma 217ᴾ | <<locked>> | 100% | 47,877 psi | 72% | 2995 fps | 99.4% |
| Norma MRP | <<locked>> | 90% | 59,306 psi | 89% | 3159 fps | 100% |
| Norma URP | <<locked>> | 84% | 57,595 psi | 86% | 3054 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 58,102 psi | 87% | 3146 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 84% | 56,768 psi | 85% | 3061 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 56,840 psi | 85% | 3074 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,218 psi | 57% | 2028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 60,046 psi | 90% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 58,508 psi | 88% | 3127 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 56,898 psi | 85% | 3186 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 56,420 psi | 85% | 3140 fps | 98.4% |
| Rottweil R 904 | <<locked>> | 88% | 57,522 psi | 86% | 3051 fps | 99.1% |
| Rottweil R 905 | <<locked>> | 90% | 59,857 psi | 90% | 3117 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 57,159 psi | 86% | 3018 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 59,379 psi | 89% | 3038 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 57,812 psi | 87% | 3038 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 58,711 psi | 88% | 2992 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 59,437 psi | 89% | 3114 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 59,321 psi | 89% | 3038 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 58,900 psi | 88% | 3058 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 60,234 psi | 90% | 3084 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 59,480 psi | 89% | 2976 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 59,321 psi | 89% | 3048 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 60,089 psi | 90% | 3064 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 58,653 psi | 88% | 3051 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 58,769 psi | 88% | 3081 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 58,769 psi | 88% | 3156 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 59,553 psi | 89% | 3143 fps | 99.2% |
| Vihtavuori N568 | <<locked>> | 98% | 56,927 psi | 85% | 3143 fps | 98% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 57,957 psi | 87% | 3199 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 59,161 psi | 89% | 2995 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 57,334 psi | 86% | 3074 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 56,260 psi | 84% | 3136 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 56,304 psi | 84% | 3022 fps | 99.6% |
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% | 39,305 psi | 59% | 2697 fps | 98.5% |
| Accurate 4350 | <<locked>> | 80% | 52,083 psi | 78% | 2963 fps | 100% |
| Accurate High Country | <<locked>> | 80% | 42,917 psi | 64% | 2871 fps | 96.1% |
| Accurate MAGPRO | 76.8 gr | 84% | 46,934 psi | 70% | 2943 fps | 96% |
| ADI AR 2209 | <<locked>> | 80% | 43,221 psi | 65% | 2831 fps | 97.3% |
| ADI AR 2213 | <<locked>> | 82% | 41,524 psi | 62% | 2822 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 90% | 40,393 psi | 61% | 2789 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 86% | 32,082 psi | 48% | 2615 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 43,671 psi | 65% | 2831 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 49,705 psi | 75% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 43,265 psi | 65% | 2825 fps | 97.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 39,160 psi | 59% | 2762 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,898 psi | 57% | 2723 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,750 psi | 49% | 2631 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 42,482 psi | 64% | 2877 fps | 99.8% |
| Alliant Reloder-33 | <<locked>> | 98% | 50,850 psi | 76% | 3048 fps | 95.1% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 52,634 psi | 79% | 2979 fps | 95.8% |
| Bofors RP15 | <<locked>> | 82% | 38,972 psi | 58% | 2756 fps | 95.9% |
| Bofors RP30 | <<locked>> | 88% | 40,030 psi | 60% | 2802 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 39,160 psi | 59% | 2762 fps | 96.1% |
| Bofors RP7 | <<locked>> | 80% | 53,592 psi | 80% | 2963 fps | 99.7% |
| Hodgdon H1000 | <<locked>> | 86% | 38,435 psi | 58% | 2743 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 53,519 psi | 80% | 3012 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 55,564 psi | 83% | 3025 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 82% | 44,193 psi | 66% | 2828 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 82% | 43,482 psi | 65% | 2812 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 46,702 psi | 70% | 2838 fps | 100% |
| Hodgdon Retumbo | 72.6 gr | 84% | 36,666 psi | 55% | 2785 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 53,940 psi | 81% | 3041 fps | 99.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,050 psi | 42% | 1778 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,950 psi | 73% | 2890 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,795 psi | 82% | 2986 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 49,139 psi | 74% | 2900 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 42,598 psi | 64% | 2766 fps | 95.4% |
| IMR 7828 SSC | <<locked>> | 82% | 40,059 psi | 60% | 2799 fps | 95% |
| IMR 8133 Enduron | <<locked>> | 96% | 40,944 psi | 61% | 2838 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 52,533 psi | 79% | 2933 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,908 psi | 76% | 2923 fps | 99.7% |
| Lovex S071 | <<locked>> | 80% | 33,692 psi | 51% | 2566 fps | 96.8% |
| Norma 204 | <<locked>> | 80% | 49,545 psi | 74% | 2936 fps | 98.5% |
| Norma 217 | <<locked>> | 90% | 33,489 psi | 50% | 2671 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 41,510 psi | 62% | 2841 fps | 98.1% |
| Norma URP | <<locked>> | 80% | 50,517 psi | 76% | 2943 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,871 psi | 60% | 2802 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 49,530 psi | 74% | 2940 fps | 99.8% |
| Ramshot Magnum | <<locked>> | 82% | 35,882 psi | 54% | 2677 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,645 psi | 43% | 1821 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 52,301 psi | 78% | 2982 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 50,662 psi | 76% | 3002 fps | 100% |
| ReloadSwiss RS 76 | 75.8 gr | 82% | 33,460 psi | 50% | 2684 fps | 95.6% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 44,614 psi | 67% | 2920 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 44,295 psi | 66% | 2808 fps | 96.5% |
| Rottweil R 905 | <<locked>> | 80% | 42,598 psi | 64% | 2808 fps | 97.3% |
| Rottweil R 907 | <<locked>> | 80% | 53,592 psi | 80% | 2963 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 52,533 psi | 79% | 2933 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,908 psi | 76% | 2923 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 51,401 psi | 77% | 2881 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 42,264 psi | 63% | 2805 fps | 97.2% |
| Somchem S361 | <<locked>> | 80% | 45,353 psi | 68% | 2795 fps | 96.1% |
| Somchem S365 | <<locked>> | 80% | 48,037 psi | 72% | 2897 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 43,192 psi | 65% | 2792 fps | 98.2% |
| Vihtavuori N150 | <<locked>> | 80% | 55,796 psi | 84% | 2927 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 52,083 psi | 78% | 2936 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 37,652 psi | 56% | 2661 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 80% | 51,459 psi | 77% | 2940 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 42,221 psi | 63% | 2805 fps | 99.9% |
| Vihtavuori N560 | <<locked>> | 82% | 44,440 psi | 67% | 2894 fps | 95.9% |
| Vihtavuori N565 | <<locked>> | 86% | 42,032 psi | 63% | 2822 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 92% | 45,571 psi | 68% | 2933 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 53,809 psi | 81% | 3127 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 51,445 psi | 77% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 53,519 psi | 80% | 3012 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 34,969 psi | 52% | 2756 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 39,624 psi | 59% | 2710 fps | 96.3% |
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 74 powders for 7 mm STW loaded with the .284 | 139gr | Hornady InterLock FP. Hodgdon Retumbo delivers the highest muzzle velocity at 3,261 fps; across all powders the maximum-charge window runs from 1,985 fps to 3,261 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 139.0 gr projectile in 0.284" calls for a 1:15.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Alliant Reloder-33 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, Accurate MAGPRO rank at the top here: for 7 mm STW with the .284 | 139gr | Hornady InterLock FP 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.