Load Specifications
Load data in caliber 7 mm STW with .284 | 160gr | Barnes X S bullet and 63 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 80 and Vihtavuori N570.
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% | 57,334 psi | 86% | 2831 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 59,466 psi | 89% | 2986 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 86% | 57,377 psi | 86% | 2904 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 59,611 psi | 89% | 2972 fps | 99.8% |
| ADI AR 2217 | <<locked>> | 98% | 58,233 psi | 87% | 2949 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 54,853 psi | 82% | 2989 fps | 97.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 56,985 psi | 85% | 2976 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 82% | 57,682 psi | 86% | 2894 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 57,116 psi | 86% | 2894 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 60,336 psi | 90% | 2972 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 90% | 58,494 psi | 88% | 2884 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 94% | 58,276 psi | 87% | 2949 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 59,451 psi | 89% | 2976 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 56,463 psi | 85% | 2982 fps | 97.7% |
| Alliant Reloder-50ᴾ | <<locked>> | 100% | 52,794 psi | 79% | 2913 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 59,727 psi | 90% | 2923 fps | 98.3% |
| Bofors RP15 | <<locked>> | 92% | 59,451 psi | 89% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 58,407 psi | 88% | 2966 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 60,336 psi | 90% | 2972 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 59,814 psi | 90% | 2969 fps | 100% |
| Hodgdon H4831 | <<locked>> | 88% | 58,972 psi | 88% | 2910 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 88% | 57,841 psi | 87% | 2890 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 58,102 psi | 87% | 2818 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 94% | 57,159 psi | 86% | 3035 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,869 psi | 57% | 1841 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 59,915 psi | 90% | 2877 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 57,493 psi | 86% | 2838 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 59,045 psi | 89% | 2884 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 90% | 57,943 psi | 87% | 2956 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 52,721 psi | 79% | 2897 fps | 99.4% |
| Lovex S070 | <<locked>> | 82% | 58,929 psi | 88% | 2861 fps | 100% |
| Lovex S071 | <<locked>> | 94% | 58,943 psi | 88% | 2854 fps | 100% |
| Norma 204 | <<locked>> | 82% | 57,624 psi | 86% | 2887 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 53,722 psi | 81% | 2923 fps | 100% |
| Norma MRP | <<locked>> | 86% | 56,739 psi | 85% | 2936 fps | 100% |
| Norma URP | <<locked>> | 82% | 58,784 psi | 88% | 2877 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 59,335 psi | 89% | 2982 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 82% | 57,740 psi | 87% | 2884 fps | 100% |
| Ramshot Magnum | <<locked>> | 92% | 58,044 psi | 87% | 2913 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,856 psi | 58% | 1883 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 59,350 psi | 89% | 2943 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 94% | 58,407 psi | 88% | 3028 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 58,175 psi | 87% | 2995 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 86% | 58,059 psi | 87% | 2871 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 86% | 57,188 psi | 86% | 2890 fps | 100% |
| Shooters World SW4350 | <<locked>> | 82% | 58,929 psi | 88% | 2861 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 59,379 psi | 89% | 2815 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 56,782 psi | 85% | 2887 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 59,756 psi | 90% | 2864 fps | 99.5% |
| Somchem S365 | <<locked>> | 82% | 56,797 psi | 85% | 2835 fps | 100% |
| Somchem S385 | <<locked>> | 86% | 57,812 psi | 87% | 2864 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 60,205 psi | 90% | 2864 fps | 100% |
| Vihtavuori N165 | <<locked>> | 90% | 57,305 psi | 86% | 2841 fps | 100% |
| Vihtavuori N170 | <<locked>> | 94% | 56,681 psi | 85% | 2861 fps | 96% |
| Vihtavuori N550 | <<locked>> | 82% | 59,509 psi | 89% | 2871 fps | 100% |
| Vihtavuori N555 | <<locked>> | 86% | 57,334 psi | 86% | 2867 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 59,930 psi | 90% | 2992 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 92% | 57,319 psi | 86% | 2930 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 96% | 58,392 psi | 88% | 2992 fps | 99% |
| Vihtavuori N570 | <<locked>> | 98% | 59,582 psi | 89% | 3054 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 59,466 psi | 89% | 2808 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 90% | 58,421 psi | 88% | 2976 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 88% | 57,203 psi | 86% | 2854 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% | 44,614 psi | 67% | 2631 fps | 99.9% |
| Accurate MAGPRO | <<locked>> | 80% | 45,542 psi | 68% | 2746 fps | 96.8% |
| ADI AR 2209 | <<locked>> | 80% | 47,529 psi | 71% | 2743 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 80% | 42,859 psi | 64% | 2684 fps | 97.2% |
| ADI AR 2217 | <<locked>> | 84% | 37,115 psi | 56% | 2552 fps | 95.7% |
| ADI AR 2218 | <<locked>> | 96% | 47,819 psi | 72% | 2854 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 80% | 30,400 psi | 46% | 2421 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 54,114 psi | 81% | 2844 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 47,485 psi | 71% | 2733 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 80% | 43,859 psi | 66% | 2697 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 42,699 psi | 64% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 37,217 psi | 56% | 2585 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 48,066 psi | 72% | 2805 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 94% | 48,950 psi | 73% | 2854 fps | 95.9% |
| Alliant Reloder-50 | <<locked>> | 98% | 49,052 psi | 74% | 2848 fps | 95.3% |
| Baschieri & Pellagri 109 | <<locked>> | 84% | 46,949 psi | 70% | 2707 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 40,988 psi | 61% | 2638 fps | 97.8% |
| Bofors RP30 | <<locked>> | 80% | 34,954 psi | 52% | 2523 fps | 95.1% |
| Bofors RP5 | <<locked>> | 80% | 43,859 psi | 66% | 2697 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 80% | 35,244 psi | 53% | 2510 fps | 95.6% |
| Hodgdon H4831 | <<locked>> | 80% | 45,411 psi | 68% | 2684 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 44,701 psi | 67% | 2667 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 51,372 psi | 77% | 2726 fps | 100% |
| Hodgdon Retumbo | 64.5 gr | 80% | 36,405 psi | 55% | 2625 fps | 97.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,529 psi | 43% | 1647 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 53,113 psi | 80% | 2779 fps | 99.9% |
| IMR 4831 | <<locked>> | 80% | 54,070 psi | 81% | 2789 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 46,485 psi | 70% | 2674 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 80% | 41,742 psi | 63% | 2671 fps | 97% |
| IMR 8133 Enduron | <<locked>> | 88% | 35,984 psi | 54% | 2566 fps | 95.3% |
| Lovex S070 | <<locked>> | 80% | 55,477 psi | 83% | 2808 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 38,899 psi | 58% | 2520 fps | 99.2% |
| Norma 204 | <<locked>> | 80% | 53,911 psi | 81% | 2828 fps | 99.7% |
| Norma 217 | <<locked>> | 82% | 30,110 psi | 45% | 2431 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 46,456 psi | 70% | 2769 fps | 99.7% |
| Norma URP | <<locked>> | 80% | 55,216 psi | 83% | 2825 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 41,713 psi | 63% | 2680 fps | 97.4% |
| Ramshot Hunter | <<locked>> | 80% | 54,099 psi | 81% | 2831 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 38,072 psi | 57% | 2569 fps | 98% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,283 psi | 44% | 1686 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 55,419 psi | 83% | 2890 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 80% | 35,737 psi | 54% | 2602 fps | 98.3% |
| ReloadSwiss RS 80 | 74.8 gr | 86% | 40,640 psi | 61% | 2684 fps | 95.6% |
| Rottweil R 904 | <<locked>> | 80% | 48,356 psi | 72% | 2713 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 80% | 47,282 psi | 71% | 2726 fps | 99.2% |
| Shooters World SW4350 | <<locked>> | 80% | 55,477 psi | 83% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 55,898 psi | 84% | 2766 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 46,920 psi | 70% | 2723 fps | 99.1% |
| Somchem S361 | <<locked>> | 80% | 49,458 psi | 74% | 2703 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 53,330 psi | 80% | 2785 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 47,964 psi | 72% | 2707 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 56,550 psi | 85% | 2812 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 41,959 psi | 63% | 2589 fps | 98.6% |
| Vihtavuori N170 | <<locked>> | 92% | 53,156 psi | 80% | 2805 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 56,043 psi | 84% | 2822 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 47,703 psi | 72% | 2723 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 46,006 psi | 69% | 2756 fps | 97.6% |
| Vihtavuori N565 | <<locked>> | 80% | 39,175 psi | 59% | 2595 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 86% | 41,669 psi | 62% | 2694 fps | 95.3% |
| Vihtavuori N570 | 76.9 gr | 92% | 48,414 psi | 73% | 2861 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 55,767 psi | 84% | 2762 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 40,741 psi | 61% | 2707 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 44,135 psi | 66% | 2638 fps | 98.6% |
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 69 powders for 7 mm STW loaded with the .284 | 160gr | Barnes X S. Vihtavuori N570 delivers the highest muzzle velocity at 3,054 fps; across all powders the maximum-charge window runs from 1,841 fps to 3,054 fps. Accurate 8700 gives the best case fill at 100 %, and 69 of the 69 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 160.0 gr projectile in 0.284" calls for a 1:10.0 twist; slower twists will usually not stabilise this weight. Accurate 8700, 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, ReloadSwiss RS 80, Vihtavuori N570 rank at the top here: for 7 mm STW with the .284 | 160gr | Barnes X S they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Accurate 8700, IMR 7977 Enduron, Lovex D100 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.