Load Specifications
Load data in caliber 7 mm STW with .284 | 155gr | Geco EXPRESS bullet and 70 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 Alliant Reloder-25.
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>> | 90% | 56,507 psi | 85% | 2874 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,072 psi | 86% | 2900 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 59,567 psi | 89% | 3035 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 57,986 psi | 87% | 2963 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 60,321 psi | 90% | 3035 fps | 99.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,494 psi | 88% | 2999 fps | 99.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,084 psi | 80% | 2966 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,247 psi | 87% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,537 psi | 86% | 2949 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,521 psi | 85% | 2969 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,131 psi | 87% | 2933 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,291 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 59,263 psi | 89% | 3025 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,217 psi | 84% | 3025 fps | 97.4% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,130 psi | 86% | 2930 fps | 97.6% |
| Bofors RP15 | <<locked>> | 94% | 59,640 psi | 89% | 3012 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 58,146 psi | 87% | 3012 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 56,521 psi | 85% | 2969 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 58,363 psi | 87% | 2900 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,173 psi | 84% | 2966 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,552 psi | 88% | 2956 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 59,480 psi | 89% | 2966 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,247 psi | 87% | 2949 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,349 psi | 87% | 2874 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,319 psi | 86% | 3084 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,640 psi | 89% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 56% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,884 psi | 85% | 2887 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,538 psi | 89% | 2917 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,392 psi | 86% | 2890 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,727 psi | 90% | 2943 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 58,378 psi | 88% | 3012 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,370 psi | 73% | 2871 fps | 98.7% |
| Lovex S065 | <<locked>> | 82% | 57,130 psi | 86% | 2864 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,059 psi | 89% | 2917 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,175 psi | 87% | 2897 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,189 psi | 87% | 2946 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,255 psi | 74% | 2900 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,594 psi | 85% | 2986 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,987 psi | 88% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,857 psi | 90% | 3038 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 58,030 psi | 87% | 2940 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,334 psi | 87% | 2966 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,464 psi | 58% | 1916 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,261 psi | 86% | 2920 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,944 psi | 90% | 3005 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,363 psi | 87% | 3077 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,856 psi | 87% | 3038 fps | 99.2% |
| Rottweil R 904 | <<locked>> | 88% | 58,726 psi | 88% | 2933 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 57,348 psi | 86% | 2946 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 58,363 psi | 87% | 2900 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,130 psi | 86% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,059 psi | 89% | 2917 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,799 psi | 90% | 2871 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,942 psi | 85% | 2940 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,652 psi | 85% | 2867 fps | 99% |
| Somchem S365 | <<locked>> | 84% | 56,579 psi | 85% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,696 psi | 86% | 2913 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,797 psi | 85% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,566 psi | 86% | 2897 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 59,756 psi | 90% | 2927 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,278 psi | 90% | 2963 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 60,133 psi | 90% | 3045 fps | 99.5% |
| Vihtavuori N565 | <<locked>> | 94% | 56,840 psi | 85% | 2972 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 58,291 psi | 87% | 3038 fps | 98.9% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,524 psi | 89% | 3097 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,333 psi | 84% | 2822 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,552 psi | 88% | 2956 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,841 psi | 87% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,551 psi | 86% | 2910 fps | 99.9% |
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% | 40,379 psi | 61% | 2605 fps | 99.3% |
| Accurate 4350 | <<locked>> | 80% | 53,388 psi | 80% | 2848 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,669 psi | 62% | 2713 fps | 95.3% |
| ADI AR 2209 | <<locked>> | 80% | 44,280 psi | 66% | 2730 fps | 98.3% |
| ADI AR 2213 | <<locked>> | 80% | 39,697 psi | 60% | 2664 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 88% | 38,711 psi | 58% | 2638 fps | 96% |
| ADI AR 2225 | <<locked>> | 84% | 30,850 psi | 46% | 2477 fps | 95.7% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,039 psi | 77% | 2848 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,367 psi | 67% | 2723 fps | 98.3% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,350 psi | 60% | 2674 fps | 97.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,117 psi | 59% | 2628 fps | 100% |
| Alliant Reloder-25 | 65 gr | 80% | 33,678 psi | 50% | 2546 fps | 98.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,888 psi | 66% | 2782 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,341 psi | 72% | 2887 fps | 95.4% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,195 psi | 71% | 2756 fps | 95.2% |
| Bofors RP15 | <<locked>> | 80% | 37,550 psi | 56% | 2608 fps | 96.4% |
| Bofors RP30 | <<locked>> | 84% | 35,839 psi | 54% | 2592 fps | 95% |
| Bofors RP5 | <<locked>> | 80% | 40,350 psi | 60% | 2674 fps | 97.5% |
| Bofors RP7 | <<locked>> | 80% | 54,781 psi | 82% | 2844 fps | 100% |
| Hodgdon H1000 | <<locked>> | 84% | 36,869 psi | 55% | 2595 fps | 95.9% |
| Hodgdon H414 | <<locked>> | 80% | 54,752 psi | 82% | 2897 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,279 psi | 63% | 2667 fps | 96.1% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,568 psi | 62% | 2654 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 47,877 psi | 72% | 2726 fps | 100% |
| Hodgdon Retumbo | 65.7 gr | 80% | 32,837 psi | 49% | 2569 fps | 95.2% |
| Hodgdon Superformance | <<locked>> | 80% | 55,419 psi | 83% | 2933 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,079 psi | 42% | 1677 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,995 psi | 75% | 2779 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,014 psi | 84% | 2864 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,270 psi | 75% | 2785 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,526 psi | 65% | 2664 fps | 96.6% |
| IMR 7828 SSC | <<locked>> | 80% | 38,450 psi | 58% | 2644 fps | 95.5% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,738 psi | 55% | 2628 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 53,679 psi | 80% | 2815 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,127 psi | 78% | 2812 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,708 psi | 52% | 2480 fps | 98% |
| Norma 204 | <<locked>> | 80% | 50,705 psi | 76% | 2828 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,242 psi | 48% | 2536 fps | 95.7% |
| Norma MRP | <<locked>> | 80% | 42,583 psi | 64% | 2743 fps | 99.1% |
| Norma URP | <<locked>> | 80% | 51,851 psi | 78% | 2828 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,116 psi | 57% | 2648 fps | 95.8% |
| Ramshot Hunter | <<locked>> | 80% | 50,734 psi | 76% | 2831 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,287 psi | 51% | 2526 fps | 96.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,892 psi | 43% | 1719 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,490 psi | 80% | 2867 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,822 psi | 78% | 2887 fps | 100% |
| ReloadSwiss RS 76 | 70.3 gr | 80% | 32,024 psi | 48% | 2539 fps | 96.2% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,496 psi | 64% | 2762 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 45,426 psi | 68% | 2707 fps | 97.6% |
| Rottweil R 905 | <<locked>> | 80% | 43,859 psi | 66% | 2713 fps | 98.4% |
| Rottweil R 907 | <<locked>> | 80% | 54,781 psi | 82% | 2844 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,679 psi | 80% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,127 psi | 78% | 2812 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,460 psi | 79% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,526 psi | 65% | 2710 fps | 98.3% |
| Somchem S361 | <<locked>> | 80% | 46,195 psi | 69% | 2694 fps | 97.2% |
| Somchem S365 | <<locked>> | 80% | 49,313 psi | 74% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,353 psi | 66% | 2694 fps | 99% |
| Vihtavuori N160 | <<locked>> | 80% | 53,272 psi | 80% | 2822 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,638 psi | 58% | 2566 fps | 97.5% |
| Vihtavuori N550 | <<locked>> | 80% | 52,576 psi | 79% | 2825 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,497 psi | 65% | 2703 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,424 psi | 64% | 2730 fps | 96.2% |
| Vihtavuori N565 | <<locked>> | 84% | 40,379 psi | 61% | 2671 fps | 95.9% |
| Vihtavuori N568 | <<locked>> | 90% | 43,584 psi | 65% | 2776 fps | 95.6% |
| Vihtavuori N570 | <<locked>> | 96% | 51,503 psi | 77% | 2963 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,504 psi | 79% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,969 psi | 82% | 2900 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,390 psi | 55% | 2667 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,770 psi | 61% | 2618 fps | 97.5% |
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 70 powders for 7 mm STW loaded with the .284 | 155gr | Geco EXPRESS. Vihtavuori N570 delivers the highest muzzle velocity at 3,097 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,097 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 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 155.0 gr projectile in 0.284" calls for a 1:11.0 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, Alliant Reloder-25 rank at the top here: for 7 mm STW with the .284 | 155gr | Geco EXPRESS 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.