Load Specifications
Load data in caliber 7 mm STW with .284 | 158gr | Prvi Partizan Grom bullet and 72 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% | 57,290 psi | 86% | 2861 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 57,812 psi | 87% | 2887 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 60,220 psi | 90% | 3022 fps | 99.3% |
| ADI AR 2209 | <<locked>> | 88% | 58,755 psi | 88% | 2949 fps | 100% |
| ADI AR 2213 | <<locked>> | 90% | 56,956 psi | 85% | 2963 fps | 99.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 59,437 psi | 89% | 2992 fps | 99.9% |
| ADI AR 2218ᴾ | <<locked>> | 100% | 51,880 psi | 78% | 2963 fps | 96.5% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 53,780 psi | 81% | 2949 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 58,769 psi | 88% | 2940 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 58,276 psi | 87% | 2940 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 90% | 57,334 psi | 86% | 2956 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 92% | 59,016 psi | 88% | 2917 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 59,219 psi | 89% | 2989 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 60,307 psi | 90% | 3012 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 57,290 psi | 86% | 3018 fps | 97.8% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 57,667 psi | 86% | 2917 fps | 97.9% |
| Bofors RP15 | <<locked>> | 94% | 60,263 psi | 90% | 2999 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 58,856 psi | 88% | 2999 fps | 99.9% |
| Bofors RP5 | <<locked>> | 90% | 57,334 psi | 86% | 2956 fps | 100% |
| Bofors RP7 | <<locked>> | 82% | 58,726 psi | 88% | 2881 fps | 100% |
| Hodgdon H1000 | <<locked>> | 96% | 57,043 psi | 86% | 2956 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 59,074 psi | 89% | 2940 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 60,278 psi | 90% | 2956 fps | 99.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 59,059 psi | 89% | 2940 fps | 99.4% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 59,074 psi | 89% | 2861 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 96% | 58,073 psi | 87% | 3071 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 60,220 psi | 90% | 2976 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,565 psi | 56% | 1857 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 57,305 psi | 86% | 2871 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 60,191 psi | 90% | 2904 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 58,102 psi | 87% | 2874 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 88% | 56,840 psi | 85% | 2877 fps | 99.3% |
| IMR 7828 SSC | <<locked>> | 92% | 59,292 psi | 89% | 3002 fps | 99.8% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 49,255 psi | 74% | 2864 fps | 98.9% |
| Lovex S065 | <<locked>> | 82% | 57,537 psi | 86% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 59,727 psi | 90% | 2904 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 58,726 psi | 88% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 84% | 58,682 psi | 88% | 2930 fps | 99.9% |
| Norma 217ᴾ | <<locked>> | 100% | 49,980 psi | 75% | 2890 fps | 100% |
| Norma MRP | <<locked>> | 88% | 57,493 psi | 86% | 2976 fps | 100% |
| Norma URP | <<locked>> | 84% | 59,727 psi | 90% | 2917 fps | 100% |
| Ramshot Grand | <<locked>> | 90% | 56,449 psi | 85% | 2966 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 84% | 58,523 psi | 88% | 2923 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 59,088 psi | 89% | 2953 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,435 psi | 58% | 1896 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 58,044 psi | 87% | 2907 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 56,463 psi | 85% | 2930 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 59,538 psi | 89% | 3068 fps | 100% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 58,726 psi | 88% | 3028 fps | 99.4% |
| Rottweil R 904 | <<locked>> | 88% | 59,437 psi | 89% | 2920 fps | 99.7% |
| Rottweil R 905 | <<locked>> | 88% | 57,885 psi | 87% | 2930 fps | 100% |
| Rottweil R 907 | <<locked>> | 82% | 58,726 psi | 88% | 2881 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 57,537 psi | 86% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 59,727 psi | 90% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 56,521 psi | 85% | 2805 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 88% | 57,479 psi | 86% | 2927 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 57,145 psi | 86% | 2854 fps | 99.2% |
| Somchem S365 | <<locked>> | 84% | 57,130 psi | 86% | 2867 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 58,204 psi | 87% | 2897 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 57,522 psi | 86% | 2858 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 58,117 psi | 87% | 2884 fps | 100% |
| Vihtavuori N170 | <<locked>> | 96% | 57,290 psi | 86% | 2897 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 82% | 56,666 psi | 85% | 2861 fps | 100% |
| Vihtavuori N555 | <<locked>> | 88% | 57,334 psi | 86% | 2897 fps | 100% |
| Vihtavuori N560 | <<locked>> | 88% | 56,942 psi | 85% | 2972 fps | 99.3% |
| Vihtavuori N565 | <<locked>> | 94% | 57,537 psi | 86% | 2963 fps | 99.5% |
| Vihtavuori N568 | <<locked>> | 98% | 59,059 psi | 89% | 3028 fps | 99.1% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 60,365 psi | 90% | 3091 fps | 98% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 57,029 psi | 85% | 2808 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 59,321 psi | 89% | 2943 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 92% | 58,958 psi | 88% | 3009 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 58,363 psi | 87% | 2897 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% | 40,814 psi | 61% | 2592 fps | 99.5% |
| Accurate 4350 | <<locked>> | 80% | 53,896 psi | 81% | 2828 fps | 100% |
| Accurate MAGPRO | <<locked>> | 80% | 42,308 psi | 63% | 2707 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 44,904 psi | 67% | 2720 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 80% | 40,263 psi | 60% | 2654 fps | 96.3% |
| ADI AR 2217 | <<locked>> | 86% | 36,709 psi | 55% | 2572 fps | 95.4% |
| ADI AR 2218 | <<locked>> | 98% | 48,080 psi | 72% | 2884 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 82% | 29,225 psi | 44% | 2408 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 51,459 psi | 77% | 2831 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 44,759 psi | 67% | 2713 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 80% | 40,930 psi | 61% | 2664 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 39,523 psi | 59% | 2612 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 34,200 psi | 51% | 2543 fps | 98.9% |
| Alliant Reloder-26 | <<locked>> | 80% | 44,454 psi | 67% | 2769 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 96% | 49,052 psi | 74% | 2877 fps | 95.8% |
| Baschieri & Pellagri 109 | <<locked>> | 86% | 47,761 psi | 72% | 2746 fps | 95.6% |
| Bofors RP15 | <<locked>> | 80% | 37,942 psi | 57% | 2598 fps | 96.8% |
| Bofors RP30 | <<locked>> | 84% | 36,477 psi | 55% | 2585 fps | 95.6% |
| Bofors RP5 | <<locked>> | 80% | 40,930 psi | 61% | 2664 fps | 97.8% |
| Bofors RP7 | <<locked>> | 80% | 55,158 psi | 83% | 2828 fps | 100% |
| Hodgdon H1000 | <<locked>> | 82% | 34,809 psi | 52% | 2526 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 55,216 psi | 83% | 2881 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 42,844 psi | 64% | 2661 fps | 96.5% |
| Hodgdon H4831 SC | <<locked>> | 80% | 42,134 psi | 63% | 2644 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 48,501 psi | 73% | 2710 fps | 100% |
| Hodgdon Retumbo | 65.6 gr | 80% | 33,359 psi | 50% | 2566 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 55,956 psi | 84% | 2913 fps | 100% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,181 psi | 42% | 1660 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 50,575 psi | 76% | 2766 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 80% | 56,579 psi | 85% | 2851 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 50,908 psi | 76% | 2772 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 44,034 psi | 66% | 2654 fps | 97% |
| IMR 7828 SSC | <<locked>> | 80% | 38,841 psi | 58% | 2631 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 92% | 37,391 psi | 56% | 2625 fps | 95.8% |
| Lovex S065 | <<locked>> | 80% | 54,056 psi | 81% | 2799 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 52,518 psi | 79% | 2795 fps | 100% |
| Lovex S071 | <<locked>> | 80% | 35,215 psi | 53% | 2470 fps | 98.3% |
| Norma 204 | <<locked>> | 80% | 51,358 psi | 77% | 2815 fps | 99.4% |
| Norma 217 | <<locked>> | 86% | 30,661 psi | 46% | 2470 fps | 95.1% |
| Norma MRP | <<locked>> | 80% | 43,265 psi | 65% | 2733 fps | 99.3% |
| Norma URP | <<locked>> | 80% | 52,286 psi | 78% | 2812 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 38,740 psi | 58% | 2641 fps | 96.3% |
| Ramshot Hunter | <<locked>> | 80% | 51,401 psi | 77% | 2818 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 34,853 psi | 52% | 2523 fps | 96.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,848 psi | 43% | 1699 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 54,244 psi | 81% | 2851 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 52,605 psi | 79% | 2877 fps | 100% |
| ReloadSwiss RS 76 | 70.2 gr | 80% | 32,547 psi | 49% | 2536 fps | 96.7% |
| ReloadSwiss RS 80 | 77.9 gr | 88% | 40,059 psi | 60% | 2694 fps | 95.2% |
| Rottweil R 904 | <<locked>> | 80% | 45,788 psi | 69% | 2697 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 80% | 44,280 psi | 66% | 2700 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 80% | 55,158 psi | 83% | 2828 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 80% | 54,056 psi | 81% | 2799 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 52,518 psi | 79% | 2795 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 53,026 psi | 79% | 2753 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 43,947 psi | 66% | 2694 fps | 98.5% |
| Somchem S361 | <<locked>> | 80% | 46,760 psi | 70% | 2684 fps | 97.5% |
| Somchem S365 | <<locked>> | 80% | 50,024 psi | 75% | 2766 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 44,962 psi | 67% | 2680 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 80% | 53,722 psi | 81% | 2802 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 39,015 psi | 58% | 2556 fps | 97.8% |
| Vihtavuori N170 | <<locked>> | 94% | 53,534 psi | 80% | 2835 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 53,200 psi | 80% | 2808 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 44,135 psi | 66% | 2694 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 43,076 psi | 65% | 2726 fps | 96.7% |
| Vihtavuori N565 | <<locked>> | 82% | 38,218 psi | 57% | 2602 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 88% | 41,292 psi | 62% | 2707 fps | 95% |
| Vihtavuori N570 | <<locked>> | 94% | 48,544 psi | 73% | 2887 fps | 95.2% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 53,156 psi | 80% | 2756 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 55,448 psi | 83% | 2884 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 37,130 psi | 56% | 2657 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 41,176 psi | 62% | 2608 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 72 powders for 7 mm STW loaded with the .284 | 158gr | Prvi Partizan Grom. Vihtavuori N570 delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,857 fps to 3,091 fps. ADI AR 2217 gives the best case fill at 100 %, and 72 of the 72 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 1:11.0 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 | 158gr | Prvi Partizan Grom 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.