Load Specifications
Load data in caliber 7 mm STW with .284 | 170gr | Hammer HHT 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, Accurate High Country and ReloadSwiss RS 76.
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% | 60,205 psi | 90% | 2805 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,058 psi | 86% | 2779 fps | 100% |
| Accurate High Country | <<locked>> | 88% | 58,204 psi | 87% | 2910 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 90% | 59,074 psi | 89% | 2913 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 88% | 57,856 psi | 87% | 2841 fps | 100% |
| ADI AR 2213 | <<locked>> | 92% | 60,046 psi | 90% | 2910 fps | 99.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,146 psi | 87% | 2881 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 50,604 psi | 76% | 2854 fps | 96.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 52,707 psi | 79% | 2848 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 88% | 58,102 psi | 87% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 57,943 psi | 87% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,450 psi | 86% | 2831 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 92% | 60,249 psi | 90% | 2904 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,015 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,030 psi | 87% | 2877 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 58,929 psi | 88% | 2900 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 55,651 psi | 83% | 2910 fps | 97.9% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 56,884 psi | 85% | 2815 fps | 98.1% |
| Bofors RP15 | <<locked>> | 94% | 59,364 psi | 89% | 2890 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 57,725 psi | 87% | 2894 fps | 99.9% |
| Bofors RP5 | <<locked>> | 92% | 60,249 psi | 90% | 2904 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,131 psi | 87% | 2772 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 60,104 psi | 90% | 2904 fps | 100% |
| Hodgdon H414 | <<locked>> | 82% | 58,291 psi | 87% | 2828 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 59,277 psi | 89% | 2848 fps | 99.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,276 psi | 87% | 2831 fps | 99.5% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,218 psi | 87% | 2753 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 56,942 psi | 85% | 2963 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,379 psi | 89% | 2867 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 56% | 1772 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,811 psi | 85% | 2766 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,422 psi | 89% | 2792 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,276 psi | 86% | 2769 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,582 psi | 89% | 2822 fps | 99.7% |
| IMR 7828 SSC | <<locked>> | 92% | 58,059 psi | 87% | 2890 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,182 psi | 72% | 2762 fps | 99.1% |
| Lovex S065 | <<locked>> | 82% | 56,898 psi | 85% | 2743 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 58,914 psi | 88% | 2792 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 57,870 psi | 87% | 2776 fps | 100% |
| Norma 204 | <<locked>> | 84% | 57,972 psi | 87% | 2822 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 48,878 psi | 73% | 2789 fps | 100% |
| Norma MRP | <<locked>> | 88% | 56,434 psi | 85% | 2867 fps | 100% |
| Norma URP | <<locked>> | 84% | 58,827 psi | 88% | 2808 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,538 psi | 89% | 2917 fps | 100% |
| Ramshot Hunter | <<locked>> | 84% | 57,812 psi | 87% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,001 psi | 87% | 2848 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,537 psi | 58% | 1814 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,203 psi | 86% | 2799 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,770 psi | 90% | 2881 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 57,972 psi | 87% | 2956 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,319 psi | 86% | 2920 fps | 99.5% |
| Rottweil R 904 | <<locked>> | 88% | 58,494 psi | 88% | 2808 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 88% | 57,203 psi | 86% | 2825 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,131 psi | 87% | 2772 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 56,898 psi | 85% | 2743 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 58,914 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,770 psi | 90% | 2749 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,797 psi | 85% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 60,307 psi | 90% | 2805 fps | 99.6% |
| Somchem S365 | <<locked>> | 86% | 60,263 psi | 90% | 2808 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,479 psi | 86% | 2792 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,782 psi | 85% | 2749 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,203 psi | 86% | 2776 fps | 100% |
| Vihtavuori N170 | <<locked>> | 98% | 60,263 psi | 90% | 2851 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 84% | 59,683 psi | 89% | 2802 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,249 psi | 90% | 2838 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 59,988 psi | 90% | 2927 fps | 99.8% |
| Vihtavuori N565 | <<locked>> | 94% | 56,521 psi | 85% | 2854 fps | 99.6% |
| Vihtavuori N568 | <<locked>> | 98% | 57,870 psi | 87% | 2920 fps | 99.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,001 psi | 88% | 2979 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 60,147 psi | 90% | 2749 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,566 psi | 88% | 2835 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 57,522 psi | 86% | 2897 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,450 psi | 86% | 2792 fps | 100% |
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% | 40,393 psi | 61% | 2500 fps | 99.6% |
| Accurate 4350 | <<locked>> | 80% | 53,388 psi | 80% | 2726 fps | 100% |
| Accurate High Country | 63.8 gr | 80% | 43,961 psi | 66% | 2671 fps | 98% |
| Accurate MAGPRO | <<locked>> | 80% | 41,539 psi | 62% | 2612 fps | 96.1% |
| ADI AR 2209 | <<locked>> | 80% | 44,237 psi | 66% | 2618 fps | 98.8% |
| ADI AR 2213 | <<locked>> | 80% | 39,610 psi | 59% | 2559 fps | 96.6% |
| ADI AR 2217 | <<locked>> | 86% | 36,071 psi | 54% | 2477 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 98% | 47,108 psi | 71% | 2785 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 82% | 28,790 psi | 43% | 2329 fps | 95.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 44,759 psi | 67% | 2625 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,039 psi | 77% | 2730 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,338 psi | 66% | 2618 fps | 98.8% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,205 psi | 60% | 2569 fps | 98.1% |
| Alliant Reloder-23 | <<locked>> | 80% | 38,928 psi | 58% | 2516 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,620 psi | 50% | 2451 fps | 99.1% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,830 psi | 66% | 2674 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 44,527 psi | 67% | 2713 fps | 95% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 44,208 psi | 66% | 2592 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 37,492 psi | 56% | 2507 fps | 97.1% |
| Bofors RP30 | <<locked>> | 84% | 35,795 psi | 54% | 2493 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 40,205 psi | 60% | 2569 fps | 98.1% |
| Bofors RP7 | <<locked>> | 80% | 54,621 psi | 82% | 2723 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,360 psi | 52% | 2438 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 54,737 psi | 82% | 2779 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,192 psi | 63% | 2562 fps | 96.8% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,452 psi | 62% | 2546 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,037 psi | 72% | 2612 fps | 100% |
| Hodgdon Retumbo | 61.5 gr | 80% | 32,880 psi | 49% | 2477 fps | 96.3% |
| Hodgdon Superformance | <<locked>> | 80% | 55,172 psi | 83% | 2812 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,137 psi | 42% | 1585 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 49,937 psi | 75% | 2664 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 55,883 psi | 84% | 2743 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,401 psi | 76% | 2671 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,468 psi | 65% | 2556 fps | 97.3% |
| IMR 7828 SSC | <<locked>> | 80% | 38,319 psi | 57% | 2539 fps | 96.3% |
| IMR 8133 Enduron | <<locked>> | 90% | 34,229 psi | 51% | 2477 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 53,505 psi | 80% | 2694 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,040 psi | 78% | 2694 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,708 psi | 52% | 2382 fps | 98.6% |
| Norma 204 | <<locked>> | 80% | 50,763 psi | 76% | 2713 fps | 99.6% |
| Norma 217 | <<locked>> | 86% | 30,124 psi | 45% | 2388 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 42,525 psi | 64% | 2635 fps | 99.4% |
| Norma URP | <<locked>> | 80% | 51,764 psi | 78% | 2707 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,159 psi | 57% | 2549 fps | 96.7% |
| Ramshot Hunter | <<locked>> | 80% | 50,734 psi | 76% | 2713 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,272 psi | 51% | 2434 fps | 97.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 43% | 1621 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,447 psi | 80% | 2746 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,909 psi | 78% | 2772 fps | 100% |
| ReloadSwiss RS 76 | 65.8 gr | 80% | 31,966 psi | 48% | 2451 fps | 97.2% |
| ReloadSwiss RS 80 | <<locked>> | 88% | 39,088 psi | 59% | 2598 fps | 95.5% |
| Rottweil R 904 | <<locked>> | 80% | 45,324 psi | 68% | 2595 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 80% | 43,801 psi | 66% | 2605 fps | 98.8% |
| Rottweil R 907 | <<locked>> | 80% | 54,621 psi | 82% | 2723 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,505 psi | 80% | 2694 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,040 psi | 78% | 2694 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,446 psi | 79% | 2648 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,453 psi | 65% | 2598 fps | 98.8% |
| Somchem S361 | <<locked>> | 80% | 46,282 psi | 69% | 2589 fps | 97.8% |
| Somchem S365 | <<locked>> | 80% | 49,240 psi | 74% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,237 psi | 66% | 2582 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 53,258 psi | 80% | 2700 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,653 psi | 58% | 2467 fps | 98.1% |
| Vihtavuori N170 | <<locked>> | 94% | 52,591 psi | 79% | 2736 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 52,504 psi | 79% | 2707 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,555 psi | 65% | 2592 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,380 psi | 64% | 2628 fps | 97% |
| Vihtavuori N565 | <<locked>> | 82% | 37,608 psi | 56% | 2510 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 88% | 40,466 psi | 61% | 2615 fps | 95.3% |
| Vihtavuori N570 | <<locked>> | 94% | 47,485 psi | 71% | 2785 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,417 psi | 79% | 2651 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,737 psi | 82% | 2779 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,419 psi | 55% | 2566 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,741 psi | 61% | 2516 fps | 98.1% |
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 | 170gr | Hammer HHT. Vihtavuori N570 delivers the highest muzzle velocity at 2,979 fps; across all powders the maximum-charge window runs from 1,772 fps to 2,979 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 170.0 gr projectile in 0.284" calls for a 1:8.0 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2218, ADI AR 2225 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, Accurate High Country, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 170gr | Hammer HHT 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.