Load Specifications
Load data in caliber 7 mm STW with .284 | 156gr | Lapua Naturalis 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 ReloadSwiss RS 80.
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% | 58,117 psi | 87% | 2887 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 58,407 psi | 88% | 2910 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 56,434 psi | 85% | 2982 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 58,885 psi | 88% | 2969 fps | 99.9% |
| ADI AR 2213 | <<locked>> | 90% | 57,159 psi | 86% | 2982 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,234 psi | 89% | 3005 fps | 99.8% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 52,069 psi | 78% | 2976 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 54,085 psi | 81% | 2972 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 59,016 psi | 88% | 2959 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,479 psi | 88% | 2959 fps | 99.9% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,682 psi | 86% | 2979 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 59,321 psi | 89% | 2943 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,306 psi | 89% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 86% | 56,173 psi | 84% | 2976 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,450 psi | 86% | 3041 fps | 97.6% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,624 psi | 86% | 2933 fps | 97.7% |
| Bofors RP15 | <<locked>> | 92% | 56,927 psi | 85% | 2966 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 59,161 psi | 89% | 3022 fps | 99.8% |
| Bofors RP5 | <<locked>> | 90% | 57,682 psi | 86% | 2979 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 59,205 psi | 89% | 2904 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,101 psi | 86% | 2976 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 59,538 psi | 89% | 2963 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,249 psi | 90% | 2972 fps | 99.4% |
| Hodgdon H4831 SC | <<locked>> | 90% | 59,306 psi | 89% | 2956 fps | 99.3% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 59,292 psi | 89% | 2881 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,073 psi | 87% | 3094 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,594 psi | 56% | 1867 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,696 psi | 86% | 2890 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,191 psi | 90% | 2920 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,508 psi | 88% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 57,014 psi | 85% | 2894 fps | 99.1% |
| IMR 7828 SSC | <<locked>> | 92% | 59,205 psi | 89% | 3018 fps | 99.7% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,734 psi | 75% | 2890 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 58,073 psi | 87% | 2871 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 60,104 psi | 90% | 2923 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 59,538 psi | 89% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,856 psi | 88% | 2949 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 50,459 psi | 76% | 2917 fps | 99.9% |
| Norma MRP | <<locked>> | 88% | 57,667 psi | 86% | 2995 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,944 psi | 90% | 2940 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,434 psi | 85% | 2986 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 58,813 psi | 88% | 2946 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 59,277 psi | 89% | 2972 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,696 psi | 58% | 1913 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,465 psi | 88% | 2930 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,637 psi | 85% | 2953 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 59,408 psi | 89% | 3087 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,943 psi | 88% | 3051 fps | 99.3% |
| Rottweil R 904 | <<locked>> | 88% | 59,567 psi | 89% | 2936 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 88% | 58,189 psi | 87% | 2949 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 59,205 psi | 89% | 2904 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 58,073 psi | 87% | 2871 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 60,104 psi | 90% | 2923 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 57,116 psi | 86% | 2825 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,783 psi | 87% | 2946 fps | 99.9% |
| Somchem S361 | <<locked>> | 86% | 57,551 psi | 86% | 2874 fps | 99.1% |
| Somchem S365 | <<locked>> | 84% | 57,725 psi | 87% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,740 psi | 88% | 2920 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,725 psi | 87% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,508 psi | 88% | 2904 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,769 psi | 87% | 2917 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 82% | 57,203 psi | 86% | 2884 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,928 psi | 87% | 2923 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 57,029 psi | 85% | 2992 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 94% | 57,957 psi | 87% | 2982 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 59,393 psi | 89% | 3048 fps | 99% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 60,336 psi | 90% | 3107 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,305 psi | 86% | 2828 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 59,538 psi | 89% | 2963 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 59,059 psi | 89% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,508 psi | 88% | 2917 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% | 41,916 psi | 63% | 2625 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 54,708 psi | 82% | 2858 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,888 psi | 64% | 2733 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 45,324 psi | 68% | 2743 fps | 98.5% |
| ADI AR 2213 | <<locked>> | 80% | 40,669 psi | 61% | 2677 fps | 96.2% |
| ADI AR 2217 | <<locked>> | 86% | 37,304 psi | 56% | 2595 fps | 95.3% |
| ADI AR 2218 | <<locked>> | 98% | 48,544 psi | 73% | 2904 fps | 95% |
| ADI AR 2225 | <<locked>> | 82% | 30,139 psi | 45% | 2448 fps | 95.3% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,764 psi | 78% | 2854 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 45,252 psi | 68% | 2736 fps | 98.5% |
| Alliant Reloder-22 | <<locked>> | 80% | 41,423 psi | 62% | 2690 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 80% | 40,205 psi | 60% | 2641 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,940 psi | 52% | 2572 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 45,295 psi | 68% | 2802 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,574 psi | 74% | 2904 fps | 95.7% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,906 psi | 72% | 2762 fps | 95.3% |
| Bofors RP15 | <<locked>> | 80% | 38,682 psi | 58% | 2628 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 37,144 psi | 56% | 2615 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 41,423 psi | 62% | 2690 fps | 97.7% |
| Bofors RP7 | <<locked>> | 80% | 55,637 psi | 83% | 2851 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 35,563 psi | 53% | 2556 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 55,651 psi | 83% | 2904 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 43,207 psi | 65% | 2680 fps | 96.3% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,496 psi | 64% | 2664 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,994 psi | 73% | 2736 fps | 100% |
| Hodgdon Retumbo | 64.8 gr | 80% | 34,127 psi | 51% | 2598 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,297 psi | 42% | 1670 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,952 psi | 76% | 2785 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,623 psi | 85% | 2867 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 51,517 psi | 77% | 2799 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,512 psi | 67% | 2677 fps | 96.9% |
| IMR 7828 SSC | <<locked>> | 80% | 39,465 psi | 59% | 2661 fps | 95.8% |
| IMR 8133 Enduron | <<locked>> | 92% | 38,130 psi | 57% | 2657 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 54,607 psi | 82% | 2822 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 53,127 psi | 80% | 2818 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 36,332 psi | 54% | 2507 fps | 98.5% |
| Norma 204 | <<locked>> | 80% | 51,590 psi | 77% | 2835 fps | 99.3% |
| Norma 217 | <<locked>> | 86% | 31,575 psi | 47% | 2510 fps | 95.4% |
| Norma MRP | <<locked>> | 80% | 43,772 psi | 66% | 2759 fps | 99.2% |
| Norma URP | <<locked>> | 80% | 52,823 psi | 79% | 2838 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 39,436 psi | 59% | 2671 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,677 psi | 77% | 2841 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 35,578 psi | 53% | 2552 fps | 96.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 29,008 psi | 43% | 1713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,708 psi | 82% | 2877 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,779 psi | 79% | 2897 fps | 100% |
| ReloadSwiss RS 76 | 69.3 gr | 80% | 33,344 psi | 50% | 2572 fps | 96.9% |
| ReloadSwiss RS 80 | 76.9 gr | 88% | 40,712 psi | 61% | 2723 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 46,253 psi | 69% | 2717 fps | 97.8% |
| Rottweil R 905 | <<locked>> | 80% | 44,875 psi | 67% | 2726 fps | 98.5% |
| Rottweil R 907 | <<locked>> | 80% | 55,637 psi | 83% | 2851 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,607 psi | 82% | 2822 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 53,127 psi | 80% | 2818 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,635 psi | 80% | 2772 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 44,527 psi | 67% | 2720 fps | 98.4% |
| Somchem S361 | <<locked>> | 80% | 47,239 psi | 71% | 2703 fps | 97.4% |
| Somchem S365 | <<locked>> | 80% | 50,604 psi | 76% | 2792 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 45,498 psi | 68% | 2707 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 54,172 psi | 81% | 2825 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,711 psi | 60% | 2582 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 94% | 54,070 psi | 81% | 2858 fps | 95% |
| Vihtavuori N550 | <<locked>> | 80% | 53,592 psi | 80% | 2831 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 45,005 psi | 67% | 2723 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,526 psi | 65% | 2749 fps | 96.6% |
| Vihtavuori N565 | <<locked>> | 82% | 39,044 psi | 59% | 2635 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 90% | 44,802 psi | 67% | 2799 fps | 95.9% |
| Vihtavuori N570 | <<locked>> | 94% | 48,936 psi | 73% | 2913 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,432 psi | 80% | 2776 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 55,898 psi | 84% | 2910 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,695 psi | 56% | 2694 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,829 psi | 63% | 2635 fps | 97.8% |
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 | 156gr | Lapua Naturalis. Vihtavuori N570 delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,867 fps to 3,107 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 155.0 gr projectile in 0.284" calls for a 1:10.0 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, ReloadSwiss RS 76, ReloadSwiss RS 80 rank at the top here: for 7 mm STW with the .284 | 156gr | Lapua Naturalis 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.