Load Specifications
Load data in caliber 7 mm STW with .284 | 170gr | Geco PLUS bullet and 61 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Vihtavuori N570, Hodgdon Retumbo 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>> | 88% | 57,319 psi | 86% | 2776 fps | 100% |
| Accurate MAGPRO | <<locked>> | 86% | 56,463 psi | 85% | 2881 fps | 99.4% |
| ADI AR 2209 | <<locked>> | 86% | 58,595 psi | 88% | 2861 fps | 100% |
| ADI AR 2213 | <<locked>> | 88% | 57,029 psi | 85% | 2874 fps | 99.9% |
| ADI AR 2217 | <<locked>> | 98% | 59,785 psi | 90% | 2907 fps | 100% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 56,173 psi | 84% | 2963 fps | 98.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 58,639 psi | 88% | 2927 fps | 100% |
| Alliant Power Pro Varmint | <<locked>> | 86% | 58,769 psi | 88% | 2858 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 58,769 psi | 88% | 2841 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 58,146 psi | 87% | 2848 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 88% | 57,464 psi | 86% | 2867 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 59,408 psi | 89% | 2828 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 59,886 psi | 90% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 84% | 56,202 psi | 84% | 2861 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 57,943 psi | 87% | 2943 fps | 98.5% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 53,534 psi | 80% | 2867 fps | 97.3% |
| Baschieri & Pellagri 109 | <<locked>> | 90% | 57,435 psi | 86% | 2835 fps | 98.5% |
| Bofors RP15 | <<locked>> | 90% | 56,869 psi | 85% | 2858 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 59,509 psi | 89% | 2920 fps | 100% |
| Bofors RP5 | <<locked>> | 88% | 57,464 psi | 86% | 2867 fps | 100% |
| Hodgdon H1000 | <<locked>> | 94% | 57,232 psi | 86% | 2871 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 60,002 psi | 90% | 2867 fps | 99.8% |
| Hodgdon H4831 SC | <<locked>> | 88% | 58,813 psi | 88% | 2851 fps | 99.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,900 psi | 88% | 2766 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 59,045 psi | 89% | 2992 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,739 psi | 57% | 1801 fps | 100% |
| IMR 4350 | <<locked>> | 82% | 57,000 psi | 85% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,740 psi | 87% | 2779 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 60,002 psi | 90% | 2841 fps | 99.8% |
| IMR 7828 SSC | <<locked>> | 90% | 59,422 psi | 89% | 2917 fps | 100% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 53,606 psi | 80% | 2848 fps | 99.8% |
| Lovex S070 | <<locked>> | 82% | 59,146 psi | 89% | 2805 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 59,205 psi | 89% | 2799 fps | 100% |
| Norma 204 | <<locked>> | 82% | 58,421 psi | 88% | 2841 fps | 100% |
| Norma 217ᴾ | <<locked>> | 100% | 54,911 psi | 82% | 2874 fps | 100% |
| Norma MRP | <<locked>> | 86% | 57,754 psi | 87% | 2884 fps | 100% |
| Norma URP | <<locked>> | 82% | 59,277 psi | 89% | 2818 fps | 100% |
| Ramshot Grand | <<locked>> | 88% | 56,826 psi | 85% | 2881 fps | 100% |
| Ramshot Hunter | <<locked>> | 82% | 58,450 psi | 88% | 2835 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 59,292 psi | 89% | 2867 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,638 psi | 58% | 1841 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 60,336 psi | 90% | 2982 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 59,596 psi | 89% | 2953 fps | 99.8% |
| Rottweil R 904 | <<locked>> | 86% | 59,088 psi | 89% | 2831 fps | 99.9% |
| Rottweil R 905 | <<locked>> | 86% | 57,812 psi | 87% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 59,146 psi | 89% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,611 psi | 89% | 2759 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 57,406 psi | 86% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 56,840 psi | 85% | 2769 fps | 99.6% |
| Somchem S365 | <<locked>> | 82% | 57,261 psi | 86% | 2772 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 58,349 psi | 87% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 58,233 psi | 87% | 2799 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 57,464 psi | 86% | 2822 fps | 97% |
| Vihtavuori N550 | <<locked>> | 82% | 60,031 psi | 90% | 2815 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,508 psi | 86% | 2808 fps | 100% |
| Vihtavuori N560 | <<locked>> | 86% | 57,145 psi | 86% | 2890 fps | 99.7% |
| Vihtavuori N565 | <<locked>> | 92% | 58,059 psi | 87% | 2881 fps | 99.8% |
| Vihtavuori N568 | <<locked>> | 96% | 59,756 psi | 90% | 2949 fps | 99.6% |
| Vihtavuori N570 | <<locked>> | 96% | 57,029 psi | 85% | 2949 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 90% | 59,988 psi | 90% | 2920 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 58,175 psi | 87% | 2812 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% | 43,845 psi | 66% | 2566 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 45,600 psi | 68% | 2694 fps | 97.6% |
| ADI AR 2209 | <<locked>> | 80% | 47,993 psi | 72% | 2694 fps | 99.5% |
| ADI AR 2213 | <<locked>> | 80% | 43,076 psi | 65% | 2638 fps | 98% |
| ADI AR 2217 | <<locked>> | 82% | 34,403 psi | 52% | 2444 fps | 95.5% |
| ADI AR 2218 | <<locked>> | 94% | 44,991 psi | 67% | 2753 fps | 95.4% |
| ADI AR 2225 | <<locked>> | 80% | 29,573 psi | 44% | 2356 fps | 96.5% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 48,225 psi | 72% | 2690 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 55,042 psi | 83% | 2792 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,776 psi | 72% | 2684 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,845 psi | 66% | 2641 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,728 psi | 64% | 2582 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,028 psi | 56% | 2526 fps | 99.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,501 psi | 73% | 2746 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 92% | 46,340 psi | 69% | 2746 fps | 96% |
| Alliant Reloder-50 | <<locked>> | 96% | 45,992 psi | 69% | 2733 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 82% | 44,512 psi | 67% | 2612 fps | 95.7% |
| Bofors RP15 | <<locked>> | 80% | 40,886 psi | 61% | 2582 fps | 98.4% |
| Bofors RP30 | <<locked>> | 80% | 34,461 psi | 52% | 2457 fps | 95.7% |
| Bofors RP5 | <<locked>> | 80% | 43,845 psi | 66% | 2641 fps | 99% |
| Hodgdon H1000 | <<locked>> | 80% | 35,012 psi | 52% | 2461 fps | 96.4% |
| Hodgdon H4831 | <<locked>> | 80% | 45,788 psi | 69% | 2638 fps | 98% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,860 psi | 67% | 2621 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,793 psi | 78% | 2671 fps | 100% |
| Hodgdon Retumbo | 66.4 gr | 80% | 36,158 psi | 54% | 2566 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,268 psi | 42% | 1611 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,606 psi | 80% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 54,215 psi | 81% | 2733 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,717 psi | 70% | 2628 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 80% | 41,916 psi | 63% | 2621 fps | 97.8% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,737 psi | 54% | 2510 fps | 96.1% |
| Lovex S070 | <<locked>> | 80% | 55,622 psi | 83% | 2756 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 37,826 psi | 57% | 2451 fps | 99.4% |
| Norma 204 | <<locked>> | 80% | 54,621 psi | 82% | 2782 fps | 99.9% |
| Norma 217 | <<locked>> | 82% | 29,138 psi | 44% | 2352 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 46,717 psi | 70% | 2710 fps | 99.9% |
| Norma URP | <<locked>> | 80% | 55,666 psi | 83% | 2769 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 42,032 psi | 63% | 2631 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 80% | 54,723 psi | 82% | 2779 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 37,927 psi | 57% | 2513 fps | 98.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,138 psi | 44% | 1650 fps | 100% |
| ReloadSwiss RS 76 | 71.1 gr | 80% | 35,476 psi | 53% | 2543 fps | 98.8% |
| ReloadSwiss RS 80 | <<locked>> | 84% | 37,695 psi | 56% | 2559 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 48,689 psi | 73% | 2667 fps | 99% |
| Rottweil R 905 | <<locked>> | 80% | 47,442 psi | 71% | 2677 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 55,622 psi | 83% | 2756 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,999 psi | 84% | 2713 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 47,094 psi | 71% | 2671 fps | 99.5% |
| Somchem S361 | <<locked>> | 80% | 49,603 psi | 74% | 2657 fps | 98.7% |
| Somchem S365 | <<locked>> | 80% | 53,635 psi | 80% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,776 psi | 72% | 2651 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 80% | 41,829 psi | 63% | 2533 fps | 99% |
| Vihtavuori N170 | <<locked>> | 90% | 50,096 psi | 75% | 2703 fps | 95.3% |
| Vihtavuori N550 | <<locked>> | 80% | 56,449 psi | 85% | 2766 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,282 psi | 71% | 2657 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,354 psi | 69% | 2707 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 80% | 38,537 psi | 58% | 2530 fps | 96.4% |
| Vihtavuori N568 | <<locked>> | 84% | 38,885 psi | 58% | 2575 fps | 95.1% |
| Vihtavuori N570 | 77.5 gr | 90% | 45,890 psi | 69% | 2756 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 80% | 41,162 psi | 62% | 2641 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,077 psi | 66% | 2585 fps | 99% |
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 61 powders for 7 mm STW loaded with the .284 | 170gr | Geco PLUS. Hodgdon Retumbo delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,801 fps to 2,992 fps. ADI AR 2218 gives the best case fill at 100 %, and 61 of the 61 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (460 MPa), the top charges use 57–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2218, ADI AR 2225, Alliant Reloder-50 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. Vihtavuori N570, Hodgdon Retumbo, ReloadSwiss RS 76 rank at the top here: for 7 mm STW with the .284 | 170gr | Geco PLUS 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.