Load Specifications
Load data in caliber 7 mm STW with .284 | 158gr | Sellier & Bellot XRG bullet and 71 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 IMR 7828 SSC.
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% | 56,768 psi | 85% | 2854 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,174 psi | 86% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 59,451 psi | 89% | 3012 fps | 99.2% |
| ADI AR 2209 | <<locked>> | 88% | 58,175 psi | 87% | 2943 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 56,173 psi | 84% | 2949 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 58,711 psi | 88% | 2979 fps | 99.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,113 psi | 80% | 2940 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,088 psi | 87% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 57,493 psi | 86% | 2927 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 56,565 psi | 85% | 2943 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 58,407 psi | 88% | 2910 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 58,450 psi | 88% | 2976 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 59,408 psi | 89% | 3002 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 56,376 psi | 85% | 3005 fps | 97.5% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,101 psi | 86% | 2910 fps | 97.8% |
| Bofors RP15 | <<locked>> | 94% | 59,741 psi | 90% | 2989 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 58,102 psi | 87% | 2989 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 56,565 psi | 85% | 2943 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 58,407 psi | 88% | 2877 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 56,318 psi | 84% | 2943 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 58,465 psi | 88% | 2930 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 59,538 psi | 89% | 2943 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 58,291 psi | 87% | 2927 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 58,479 psi | 88% | 2851 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 57,232 psi | 86% | 3061 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 59,683 psi | 89% | 2966 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,492 psi | 56% | 1850 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 56,782 psi | 85% | 2861 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 59,596 psi | 89% | 2894 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 57,479 psi | 86% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 59,973 psi | 90% | 2923 fps | 99.5% |
| IMR 7828 SSC | <<locked>> | 92% | 58,465 psi | 88% | 2989 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 48,544 psi | 73% | 2851 fps | 98.8% |
| Lovex S065 | <<locked>> | 82% | 57,188 psi | 86% | 2841 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,190 psi | 89% | 2894 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,218 psi | 87% | 2874 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,131 psi | 87% | 2920 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,226 psi | 74% | 2877 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 56,666 psi | 85% | 2963 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,088 psi | 89% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 59,988 psi | 90% | 3015 fps | 99.9% |
| Ramshot Hunter | <<locked>> | 84% | 57,972 psi | 87% | 2917 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 58,291 psi | 87% | 2943 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,377 psi | 58% | 1893 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 57,450 psi | 86% | 2900 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 59,944 psi | 90% | 2979 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 58,465 psi | 88% | 3054 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 57,769 psi | 87% | 3015 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 58,668 psi | 88% | 2910 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 57,334 psi | 86% | 2920 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 58,407 psi | 88% | 2877 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,188 psi | 86% | 2841 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,190 psi | 89% | 2894 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 59,886 psi | 90% | 2848 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 56,927 psi | 85% | 2917 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 56,710 psi | 85% | 2844 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 56,463 psi | 85% | 2858 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 57,682 psi | 86% | 2887 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 56,884 psi | 85% | 2848 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 57,638 psi | 86% | 2874 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 56,681 psi | 85% | 2887 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 84% | 59,915 psi | 90% | 2904 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 60,292 psi | 90% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 60,249 psi | 90% | 3022 fps | 99.6% |
| Vihtavuori N565 | <<locked>> | 94% | 56,797 psi | 85% | 2946 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 58,363 psi | 87% | 3015 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 59,379 psi | 89% | 3074 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 56,304 psi | 84% | 2795 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 58,711 psi | 88% | 2933 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,015 psi | 87% | 2999 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 57,609 psi | 86% | 2887 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% | 40,451 psi | 61% | 2582 fps | 99.4% |
| Accurate 4350 | <<locked>> | 80% | 53,461 psi | 80% | 2822 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 41,785 psi | 63% | 2697 fps | 95.5% |
| ADI AR 2209 | <<locked>> | 80% | 44,324 psi | 66% | 2710 fps | 98.4% |
| ADI AR 2213 | <<locked>> | 80% | 39,755 psi | 60% | 2644 fps | 96.1% |
| ADI AR 2217 | <<locked>> | 86% | 36,289 psi | 54% | 2559 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 84% | 30,922 psi | 46% | 2464 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,024 psi | 76% | 2825 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,396 psi | 67% | 2703 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,408 psi | 61% | 2651 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,146 psi | 59% | 2605 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 33,692 psi | 51% | 2530 fps | 98.7% |
| Alliant Reloder-26 | <<locked>> | 80% | 43,859 psi | 66% | 2759 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 48,385 psi | 73% | 2867 fps | 95.6% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,210 psi | 71% | 2733 fps | 95.4% |
| Bofors RP15 | <<locked>> | 80% | 37,579 psi | 56% | 2589 fps | 96.6% |
| Bofors RP30 | <<locked>> | 84% | 35,955 psi | 54% | 2572 fps | 95.3% |
| Bofors RP5 | <<locked>> | 80% | 40,408 psi | 61% | 2651 fps | 97.6% |
| Bofors RP7 | <<locked>> | 80% | 54,795 psi | 82% | 2822 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,374 psi | 52% | 2513 fps | 95% |
| Hodgdon H414 | <<locked>> | 80% | 54,824 psi | 82% | 2874 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,337 psi | 63% | 2648 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 41,611 psi | 62% | 2631 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,066 psi | 72% | 2703 fps | 100% |
| Hodgdon Retumbo | 64.9 gr | 80% | 32,895 psi | 49% | 2552 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 55,390 psi | 83% | 2907 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,195 psi | 42% | 1657 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,009 psi | 75% | 2756 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,014 psi | 84% | 2841 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,502 psi | 76% | 2766 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 43,540 psi | 65% | 2644 fps | 96.8% |
| IMR 7828 SSC | 64.9 gr | 80% | 38,508 psi | 58% | 2625 fps | 95.7% |
| IMR 8133 Enduron | <<locked>> | 92% | 36,912 psi | 55% | 2615 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 53,693 psi | 80% | 2792 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,170 psi | 78% | 2789 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 34,838 psi | 52% | 2461 fps | 98.2% |
| Norma 204 | <<locked>> | 80% | 50,807 psi | 76% | 2805 fps | 99.3% |
| Norma 217 | <<locked>> | 88% | 32,372 psi | 49% | 2520 fps | 96% |
| Norma MRP | <<locked>> | 80% | 42,714 psi | 64% | 2723 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 51,880 psi | 78% | 2805 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,203 psi | 57% | 2631 fps | 96.1% |
| Ramshot Hunter | <<locked>> | 80% | 50,821 psi | 76% | 2808 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,374 psi | 52% | 2513 fps | 96.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,863 psi | 43% | 1696 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 53,621 psi | 80% | 2844 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 51,996 psi | 78% | 2867 fps | 100% |
| ReloadSwiss RS 76 | 69.5 gr | 80% | 32,126 psi | 48% | 2523 fps | 96.5% |
| ReloadSwiss RS 80 | <<locked>> | 90% | 42,467 psi | 64% | 2743 fps | 96% |
| Rottweil R 904 | <<locked>> | 80% | 45,426 psi | 68% | 2687 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 43,888 psi | 66% | 2694 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 54,795 psi | 82% | 2822 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 53,693 psi | 80% | 2792 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,170 psi | 78% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 52,475 psi | 79% | 2743 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,555 psi | 65% | 2687 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 46,311 psi | 69% | 2674 fps | 97.3% |
| Somchem S365 | <<locked>> | 80% | 49,342 psi | 74% | 2759 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,411 psi | 67% | 2671 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 80% | 53,316 psi | 80% | 2795 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 38,667 psi | 58% | 2546 fps | 97.7% |
| Vihtavuori N170 | <<locked>> | 94% | 52,939 psi | 79% | 2825 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 52,649 psi | 79% | 2802 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 43,497 psi | 65% | 2680 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 42,540 psi | 64% | 2713 fps | 96.5% |
| Vihtavuori N565 | <<locked>> | 82% | 37,739 psi | 57% | 2592 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 90% | 43,700 psi | 66% | 2759 fps | 95.8% |
| Vihtavuori N570 | <<locked>> | 96% | 51,503 psi | 77% | 2943 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 52,649 psi | 79% | 2746 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 54,824 psi | 82% | 2874 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 36,506 psi | 55% | 2648 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 40,857 psi | 61% | 2598 fps | 97.7% |
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 71 powders for 7 mm STW loaded with the .284 | 158gr | Sellier & Bellot XRG. Vihtavuori N570 delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,850 fps to 3,074 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 158.0 gr projectile in 0.284" calls for a 1:10.5 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, IMR 7828 SSC rank at the top here: for 7 mm STW with the .284 | 158gr | Sellier & Bellot XRG 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.