Load Specifications
Load data in caliber 7 mm STW with .284 | 150gr | Swift Scirocco bullet and 73 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 Vihtavuori N560.
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 3100 | <<locked>> | 92% | 57,943 psi | 87% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 58,711 psi | 88% | 2963 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 56,637 psi | 85% | 3031 fps | 98.5% |
| ADI AR 2209 | <<locked>> | 90% | 59,524 psi | 89% | 3025 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 92% | 57,580 psi | 86% | 3031 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 55,666 psi | 83% | 2995 fps | 99.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 50,154 psi | 75% | 2956 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 59,712 psi | 90% | 3022 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 86% | 59,582 psi | 89% | 3018 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 59,001 psi | 88% | 3012 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 92% | 57,885 psi | 87% | 3028 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 94% | 59,234 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 59,393 psi | 89% | 3061 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 56,289 psi | 84% | 3028 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 52,997 psi | 79% | 3005 fps | 96.2% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 58,581 psi | 88% | 2989 fps | 97.5% |
| Bofors RP15 | <<locked>> | 94% | 57,029 psi | 85% | 3012 fps | 99.8% |
| Bofors RP30ᴾ | <<locked>> | 100% | 59,059 psi | 89% | 3064 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 57,885 psi | 87% | 3028 fps | 99.9% |
| Bofors RP7 | <<locked>> | 84% | 59,959 psi | 90% | 2959 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 57,508 psi | 86% | 3025 fps | 99.8% |
| Hodgdon H414 | <<locked>> | 84% | 60,017 psi | 90% | 3015 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 58,523 psi | 88% | 2976 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 57,014 psi | 85% | 2966 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 59,915 psi | 90% | 3012 fps | 99.2% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 59,828 psi | 90% | 2936 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 58,073 psi | 87% | 3140 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 57,000 psi | 85% | 2995 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,420 psi | 56% | 1893 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 58,363 psi | 87% | 2946 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,711 psi | 87% | 2930 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 58,755 psi | 88% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 57,711 psi | 87% | 2949 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 59,640 psi | 89% | 3074 fps | 99.6% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 45,803 psi | 69% | 2861 fps | 97.8% |
| Lovex S065 | <<locked>> | 84% | 58,610 psi | 88% | 2927 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,898 psi | 85% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 59,146 psi | 89% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 86% | 59,756 psi | 90% | 3005 fps | 99.8% |
| Norma 217ᴾ | <<locked>> | 100% | 46,267 psi | 69% | 2887 fps | 99.5% |
| Norma MRP | <<locked>> | 90% | 57,899 psi | 87% | 3048 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,623 psi | 85% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 56,536 psi | 85% | 3031 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 86% | 59,451 psi | 89% | 3002 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 59,654 psi | 89% | 3025 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 57% | 1936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 58,842 psi | 88% | 2986 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 57,174 psi | 86% | 3009 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 59,553 psi | 89% | 3136 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 58,842 psi | 88% | 3094 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 90% | 60,118 psi | 90% | 2992 fps | 99.5% |
| Rottweil R 905 | <<locked>> | 90% | 58,552 psi | 88% | 3002 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 59,959 psi | 90% | 2959 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 84% | 58,610 psi | 88% | 2927 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,898 psi | 85% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,696 psi | 86% | 2881 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 58,117 psi | 87% | 2999 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 58,218 psi | 87% | 2927 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 57,812 psi | 87% | 2943 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 59,190 psi | 89% | 2972 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 58,566 psi | 88% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 58,465 psi | 88% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 58,885 psi | 88% | 2953 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 57,551 psi | 86% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 57,725 psi | 87% | 2969 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 57,464 psi | 86% | 3045 fps | 99.1% |
| Vihtavuori N565 | <<locked>> | 96% | 57,972 psi | 87% | 3028 fps | 99.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 59,205 psi | 89% | 3094 fps | 98.7% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 56,159 psi | 84% | 3084 fps | 96.5% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 58,030 psi | 87% | 2884 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 60,278 psi | 90% | 3018 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 58,595 psi | 88% | 3077 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 59,234 psi | 89% | 2969 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% | 38,450 psi | 58% | 2598 fps | 98.7% |
| Accurate 4350 | <<locked>> | 80% | 50,995 psi | 76% | 2851 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 42,598 psi | 64% | 2769 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 42,482 psi | 64% | 2730 fps | 97.5% |
| ADI AR 2213 | <<locked>> | 82% | 40,756 psi | 61% | 2720 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 90% | 39,610 psi | 59% | 2690 fps | 95.8% |
| ADI AR 2225 | <<locked>> | 86% | 31,357 psi | 47% | 2523 fps | 95.4% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 42,801 psi | 64% | 2726 fps | 97.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,849 psi | 73% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,395 psi | 64% | 2720 fps | 97.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,334 psi | 57% | 2664 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 37,057 psi | 56% | 2625 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 32,111 psi | 48% | 2539 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 41,539 psi | 62% | 2779 fps | 99.9% |
| Alliant Reloder-33 | <<locked>> | 98% | 49,226 psi | 74% | 2940 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 48,457 psi | 73% | 2812 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 35,665 psi | 53% | 2598 fps | 95.2% |
| Bofors RP30 | <<locked>> | 88% | 39,131 psi | 59% | 2703 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 38,334 psi | 57% | 2664 fps | 96.4% |
| Bofors RP7 | <<locked>> | 80% | 52,953 psi | 79% | 2854 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 37,652 psi | 56% | 2644 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 52,475 psi | 79% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 54,679 psi | 82% | 2913 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 80% | 40,567 psi | 61% | 2664 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 82% | 42,670 psi | 64% | 2710 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,890 psi | 69% | 2733 fps | 100% |
| Hodgdon Retumbo | 67.8 gr | 84% | 35,868 psi | 54% | 2687 fps | 96.2% |
| Hodgdon Superformance | <<locked>> | 80% | 52,866 psi | 79% | 2930 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,920 psi | 42% | 1693 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 48,225 psi | 72% | 2785 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 54,186 psi | 81% | 2874 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 48,298 psi | 72% | 2792 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,945 psi | 63% | 2664 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 82% | 39,218 psi | 59% | 2697 fps | 95.3% |
| IMR 8133 Enduron | <<locked>> | 96% | 39,813 psi | 60% | 2736 fps | 96% |
| Lovex S065 | <<locked>> | 80% | 51,663 psi | 77% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 50,067 psi | 75% | 2815 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 33,054 psi | 50% | 2474 fps | 97.1% |
| Norma 204 | <<locked>> | 80% | 48,646 psi | 73% | 2825 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 32,648 psi | 49% | 2579 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 40,466 psi | 61% | 2736 fps | 98.3% |
| Norma URP | <<locked>> | 80% | 49,632 psi | 74% | 2835 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 39,001 psi | 58% | 2703 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 48,573 psi | 73% | 2831 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 32,503 psi | 49% | 2516 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 43% | 1736 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 51,155 psi | 77% | 2871 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 49,443 psi | 74% | 2890 fps | 100% |
| ReloadSwiss RS 76 | 70.9 gr | 82% | 32,793 psi | 49% | 2595 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 43,047 psi | 65% | 2815 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 43,526 psi | 65% | 2703 fps | 96.7% |
| Rottweil R 905 | <<locked>> | 80% | 42,018 psi | 63% | 2713 fps | 97.6% |
| Rottweil R 907 | <<locked>> | 80% | 52,953 psi | 79% | 2854 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,663 psi | 77% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 50,067 psi | 75% | 2815 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,734 psi | 76% | 2772 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,684 psi | 62% | 2707 fps | 97.5% |
| Somchem S361 | <<locked>> | 80% | 44,440 psi | 67% | 2694 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 47,152 psi | 71% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,395 psi | 64% | 2690 fps | 98.3% |
| Vihtavuori N150 | <<locked>> | 80% | 54,911 psi | 82% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 51,068 psi | 77% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,840 psi | 55% | 2562 fps | 96.5% |
| Vihtavuori N550 | <<locked>> | 80% | 50,444 psi | 76% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,495 psi | 62% | 2703 fps | 100% |
| Vihtavuori N560 | 67 gr | 80% | 40,408 psi | 61% | 2726 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 86% | 41,060 psi | 62% | 2720 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 44,382 psi | 67% | 2831 fps | 95.4% |
| Vihtavuori N570 | <<locked>> | 98% | 52,098 psi | 78% | 3015 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 50,415 psi | 76% | 2779 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,721 psi | 79% | 2907 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,881 psi | 51% | 2654 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,928 psi | 58% | 2615 fps | 96.6% |
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 | 150gr | Swift Scirocco. Hodgdon Retumbo delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,893 fps to 3,140 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 150.0 gr projectile in 0.284" calls for a 1:9.5 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, Vihtavuori N560 rank at the top here: for 7 mm STW with the .284 | 150gr | Swift Scirocco 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.