Load Specifications
Load data in caliber 7 mm WSM with .284 | 158gr | Prvi Partizan Grom bullet and 81 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP and Vihtavuori N560.
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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 57,624 psi | 90% | 2890 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,521 psi | 87% | 2874 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,086 psi | 88% | 2986 fps | 97.5% |
| ADI AR 2208 | <<locked>> | 84% | 57,174 psi | 90% | 2838 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,347 psi | 88% | 2927 fps | 99.2% |
| ADI AR 2213 | <<locked>> | 98% | 57,725 psi | 90% | 2986 fps | 98.6% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 45,049 psi | 71% | 2753 fps | 96.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,972 psi | 63% | 2713 fps | 98% |
| Alliant Power Pro Varmint | <<locked>> | 94% | 56,449 psi | 88% | 2923 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,839 psi | 86% | 2808 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,318 psi | 88% | 2930 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,696 psi | 90% | 2946 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,709 psi | 87% | 2913 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,319 psi | 90% | 2982 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,592 psi | 86% | 2900 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,430 psi | 79% | 2900 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,665 psi | 86% | 2989 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,144 psi | 88% | 2963 fps | 99.2% |
| Bofors RP3 | <<locked>> | 82% | 55,825 psi | 87% | 2828 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,166 psi | 72% | 2825 fps | 97.1% |
| Bofors RP5 | <<locked>> | 98% | 57,319 psi | 90% | 2982 fps | 99.4% |
| Bofors RP7 | <<locked>> | 86% | 54,897 psi | 86% | 2822 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,719 psi | 78% | 2848 fps | 98% |
| Hodgdon H380 | <<locked>> | 82% | 55,956 psi | 88% | 2848 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,551 psi | 90% | 2933 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 86% | 56,637 psi | 89% | 2887 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 94% | 54,012 psi | 85% | 2867 fps | 97.4% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,768 psi | 89% | 2910 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,695 psi | 89% | 2851 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,327 psi | 77% | 2953 fps | 99.2% |
| Hodgdon Superformance | <<locked>> | 86% | 53,838 psi | 84% | 2907 fps | 99.6% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,956 psi | 58% | 1781 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,608 psi | 89% | 2818 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,188 psi | 88% | 2861 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,449 psi | 88% | 2848 fps | 99.8% |
| IMR 4831 | <<locked>> | 90% | 56,014 psi | 88% | 2867 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,448 psi | 87% | 2854 fps | 97.8% |
| IMR 7828 SSC | <<locked>> | 98% | 55,390 psi | 87% | 2963 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 57,232 psi | 90% | 2815 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,058 psi | 89% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,013 psi | 86% | 2841 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,329 psi | 80% | 2799 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 57,203 psi | 90% | 2917 fps | 99.2% |
| Norma MRP | <<locked>> | 96% | 57,043 psi | 89% | 3002 fps | 99.9% |
| Norma URP | <<locked>> | 90% | 57,653 psi | 90% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,072 psi | 88% | 2982 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 90% | 56,434 psi | 88% | 2917 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,969 psi | 85% | 2913 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,637 psi | 59% | 1821 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,666 psi | 87% | 2835 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,145 psi | 90% | 2936 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,390 psi | 87% | 2897 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,725 psi | 90% | 2982 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,603 psi | 78% | 2949 fps | 99.8% |
| Rottweil R 903 | <<locked>> | 84% | 56,246 psi | 88% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,638 psi | 90% | 2894 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 94% | 55,317 psi | 87% | 2907 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 86% | 54,897 psi | 86% | 2822 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,058 psi | 89% | 2848 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,232 psi | 90% | 2815 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,013 psi | 86% | 2841 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,638 psi | 90% | 2884 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,304 psi | 88% | 2700 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,492 psi | 89% | 2802 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,868 psi | 86% | 2900 fps | 99.1% |
| Somchem S355 | <<locked>> | 84% | 55,999 psi | 88% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,811 psi | 87% | 2835 fps | 97.7% |
| Somchem S365 | <<locked>> | 90% | 53,969 psi | 85% | 2861 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,753 psi | 87% | 2877 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 86% | 57,203 psi | 90% | 2795 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,927 psi | 88% | 2851 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,143 psi | 86% | 2854 fps | 99.4% |
| Vihtavuori N540 | <<locked>> | 82% | 57,696 psi | 90% | 2789 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 55,143 psi | 86% | 2858 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,971 psi | 89% | 2927 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,985 psi | 89% | 2999 fps | 98.2% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,634 psi | 82% | 2910 fps | 97.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,521 psi | 87% | 2815 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,551 psi | 90% | 2933 fps | 99.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,056 psi | 86% | 3031 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,709 psi | 87% | 2874 fps | 99.1% |
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% | 31,372 psi | 49% | 2398 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 42,322 psi | 66% | 2654 fps | 99.7% |
| Accurate MAGPRO | <<locked>> | 92% | 48,776 psi | 76% | 2861 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 50,546 psi | 79% | 2736 fps | 100% |
| ADI AR 2209 | <<locked>> | 82% | 37,884 psi | 59% | 2579 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 90% | 44,121 psi | 69% | 2743 fps | 95.7% |
| ADI AR 2217 | <<locked>> | 98% | 42,235 psi | 66% | 2697 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 35,172 psi | 55% | 2589 fps | 96.1% |
| Alliant Power Pro Varmint | <<locked>> | 82% | 38,159 psi | 60% | 2582 fps | 95.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,532 psi | 81% | 2762 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,683 psi | 64% | 2661 fps | 99.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,673 psi | 73% | 2782 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 37,797 psi | 59% | 2575 fps | 95.2% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,290 psi | 60% | 2628 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,110 psi | 47% | 2425 fps | 98.7% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,124 psi | 47% | 2444 fps | 95.6% |
| Alliant Reloder-26 | 57.3 gr | 80% | 32,561 psi | 51% | 2549 fps | 97.6% |
| Bofors RP15 | <<locked>> | 88% | 37,985 psi | 60% | 2618 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 52,417 psi | 82% | 2779 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,524 psi | 64% | 2710 fps | 95.4% |
| Bofors RP5 | <<locked>> | 86% | 38,290 psi | 60% | 2628 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 98.3% |
| Hodgdon H1000 | <<locked>> | 94% | 40,451 psi | 63% | 2657 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 52,562 psi | 82% | 2795 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,092 psi | 69% | 2703 fps | 98.5% |
| Hodgdon H4350 | <<locked>> | 80% | 46,862 psi | 73% | 2720 fps | 98% |
| Hodgdon H4831 | <<locked>> | 88% | 44,266 psi | 69% | 2694 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,253 psi | 72% | 2733 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,406 psi | 60% | 2552 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,884 psi | 59% | 2694 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 43,192 psi | 68% | 2720 fps | 98.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 43% | 1591 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,200 psi | 83% | 2769 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,104 psi | 64% | 2592 fps | 97.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,021 psi | 74% | 2690 fps | 98.8% |
| IMR 4831 | <<locked>> | 80% | 40,553 psi | 64% | 2605 fps | 99.5% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,905 psi | 72% | 2690 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 90% | 42,250 psi | 66% | 2717 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 53,795 psi | 84% | 2766 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,440 psi | 70% | 2638 fps | 99.3% |
| Lovex S070 | <<locked>> | 80% | 42,757 psi | 67% | 2625 fps | 98.3% |
| Lovex S071 | <<locked>> | 84% | 30,734 psi | 48% | 2382 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 40,756 psi | 64% | 2621 fps | 95.9% |
| Norma MRP | 57 gr | 82% | 34,969 psi | 55% | 2579 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 41,698 psi | 65% | 2644 fps | 99.6% |
| Ramshot Grand | <<locked>> | 90% | 42,148 psi | 66% | 2726 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 40,480 psi | 63% | 2635 fps | 98.4% |
| Ramshot Magnum | <<locked>> | 90% | 37,463 psi | 59% | 2602 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1627 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,112 psi | 82% | 2776 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,501 psi | 78% | 2825 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,235 psi | 66% | 2677 fps | 99.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,553 psi | 64% | 2687 fps | 99.3% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 34,766 psi | 54% | 2612 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 49,298 psi | 77% | 2726 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 42,090 psi | 66% | 2621 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 82% | 37,043 psi | 58% | 2559 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 45,542 psi | 71% | 2661 fps | 98.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,440 psi | 70% | 2638 fps | 99.3% |
| Shooters World Precision | <<locked>> | 80% | 53,795 psi | 84% | 2766 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,757 psi | 67% | 2625 fps | 98.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,459 psi | 79% | 2779 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,879 psi | 78% | 2615 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,511 psi | 68% | 2585 fps | 98.4% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,218 psi | 61% | 2612 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 49,240 psi | 77% | 2720 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,687 psi | 72% | 2664 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 38,450 psi | 60% | 2602 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,317 psi | 55% | 2490 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 47,123 psi | 74% | 2648 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,163 psi | 68% | 2641 fps | 99.7% |
| Vihtavuori N165 | <<locked>> | 86% | 37,173 psi | 58% | 2530 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 54,317 psi | 85% | 2743 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,627 psi | 67% | 2644 fps | 99.6% |
| Vihtavuori N555 | <<locked>> | 80% | 33,808 psi | 53% | 2503 fps | 98.7% |
| Vihtavuori N560 | 61.2 gr | 88% | 43,410 psi | 68% | 2753 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 94% | 42,917 psi | 67% | 2733 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,221 psi | 66% | 2608 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,324 psi | 69% | 2707 fps | 98.5% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,672 psi | 42% | 2421 fps | 98.4% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,479 psi | 62% | 2582 fps | 95.7% |
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 81 powders for 7 mm WSM loaded with the .284 | 158gr | Prvi Partizan Grom. Winchester StaBALL HD delivers the highest muzzle velocity at 3,031 fps; across all powders the maximum-charge window runs from 1,781 fps to 3,031 fps. ADI AR 2217 gives the best case fill at 100 %, and 81 of the 81 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 58–90 %, 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 2225, Alliant Reloder-25 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm WSM 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.