Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 158gr | Prvi Partizan Grom bullet and 76 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, Vihtavuori N560 and Norma MRP.
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>> | 94% | 55,521 psi | 87% | 2877 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,869 psi | 89% | 2910 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,159 psi | 90% | 3028 fps | 99.1% |
| Accurate MAGPRO | <<locked>> | 92% | 54,172 psi | 85% | 2969 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 82% | 57,725 psi | 90% | 2864 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,609 psi | 90% | 2969 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 94% | 55,463 psi | 87% | 2972 fps | 98.7% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,705 psi | 78% | 2867 fps | 98% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,382 psi | 70% | 2828 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 54,143 psi | 85% | 2907 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,172 psi | 85% | 2913 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,042 psi | 86% | 2923 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,203 psi | 90% | 2956 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,506 psi | 87% | 2969 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,463 psi | 88% | 2936 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,999 psi | 88% | 3002 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,305 psi | 90% | 3031 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,942 psi | 89% | 2927 fps | 96.4% |
| Bofors RP15 | <<locked>> | 96% | 54,447 psi | 85% | 2949 fps | 99.3% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,967 psi | 81% | 2940 fps | 98.6% |
| Bofors RP5 | <<locked>> | 94% | 55,506 psi | 87% | 2969 fps | 99.5% |
| Bofors RP7 | <<locked>> | 84% | 55,448 psi | 87% | 2854 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,853 psi | 86% | 2959 fps | 99.3% |
| Hodgdon H414 | <<locked>> | 84% | 54,708 psi | 86% | 2907 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,392 psi | 90% | 2920 fps | 99.6% |
| Hodgdon H4831 | <<locked>> | 92% | 55,201 psi | 87% | 2907 fps | 98.1% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,215 psi | 85% | 2890 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,476 psi | 85% | 2838 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,897 psi | 86% | 3074 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 55,216 psi | 87% | 2946 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,231 psi | 58% | 1818 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,116 psi | 90% | 2894 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,869 psi | 89% | 2877 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 57,014 psi | 89% | 2897 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,304 psi | 88% | 2894 fps | 98.4% |
| IMR 7828 SSC | <<locked>> | 96% | 57,072 psi | 89% | 3009 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 57,479 psi | 90% | 2877 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,738 psi | 87% | 2874 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,579 psi | 89% | 2894 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,418 psi | 85% | 2894 fps | 99.1% |
| Norma 217ᴾ | <<locked>> | 100% | 40,016 psi | 63% | 2753 fps | 97.8% |
| Norma MRP | <<locked>> | 92% | 55,332 psi | 87% | 2989 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 55,172 psi | 86% | 2890 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,838 psi | 84% | 2969 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 88% | 57,638 psi | 90% | 2949 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,347 psi | 88% | 2966 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,913 psi | 59% | 1860 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,898 psi | 89% | 2933 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,216 psi | 87% | 2963 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 3071 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,372 psi | 79% | 2946 fps | 97% |
| Rottweil R 903 | <<locked>> | 82% | 57,029 psi | 89% | 2858 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,201 psi | 87% | 2881 fps | 98.6% |
| Rottweil R 905 | <<locked>> | 92% | 56,492 psi | 89% | 2943 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 55,448 psi | 87% | 2854 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,479 psi | 90% | 2877 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,738 psi | 87% | 2874 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,710 psi | 89% | 2726 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,753 psi | 89% | 2828 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,057 psi | 88% | 2940 fps | 99.5% |
| Somchem S355 | <<locked>> | 82% | 56,507 psi | 89% | 2848 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,753 psi | 89% | 2874 fps | 98.3% |
| Somchem S365 | <<locked>> | 88% | 55,651 psi | 87% | 2894 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,174 psi | 90% | 2917 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,288 psi | 85% | 2772 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,014 psi | 89% | 2884 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,797 psi | 89% | 2900 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 56,260 psi | 88% | 2890 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,419 psi | 87% | 2917 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,158 psi | 86% | 2986 fps | 98.3% |
| Vihtavuori N565 | <<locked>> | 98% | 54,781 psi | 86% | 2959 fps | 98.4% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,547 psi | 81% | 2953 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,637 psi | 89% | 2844 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,940 psi | 86% | 2910 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,259 psi | 85% | 3018 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,203 psi | 90% | 2913 fps | 99.5% |
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% | 34,751 psi | 54% | 2490 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 46,499 psi | 73% | 2743 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 40,292 psi | 63% | 2710 fps | 95.3% |
| Accurate MAGPRO | <<locked>> | 88% | 47,007 psi | 74% | 2838 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 54,085 psi | 85% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,595 psi | 60% | 2612 fps | 95.8% |
| ADI AR 2213 | <<locked>> | 86% | 42,264 psi | 66% | 2723 fps | 95.6% |
| ADI AR 2217 | <<locked>> | 94% | 40,683 psi | 64% | 2684 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 90% | 32,097 psi | 50% | 2520 fps | 95.1% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 39,160 psi | 61% | 2618 fps | 96% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,309 psi | 69% | 2746 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,372 psi | 81% | 2867 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,798 psi | 61% | 2612 fps | 96% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,898 psi | 58% | 2605 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,286 psi | 52% | 2516 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,921 psi | 45% | 2415 fps | 95.4% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,390 psi | 57% | 2651 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,606 psi | 84% | 2871 fps | 95.6% |
| Bofors RP15 | <<locked>> | 84% | 36,782 psi | 58% | 2602 fps | 95.2% |
| Bofors RP30 | <<locked>> | 92% | 39,566 psi | 62% | 2697 fps | 95.5% |
| Bofors RP5 | <<locked>> | 82% | 36,898 psi | 58% | 2605 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 49,023 psi | 77% | 2746 fps | 99.1% |
| Hodgdon H1000 | <<locked>> | 90% | 38,827 psi | 61% | 2644 fps | 95.4% |
| Hodgdon H414 | <<locked>> | 80% | 48,080 psi | 75% | 2795 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,575 psi | 79% | 2808 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 86% | 45,136 psi | 71% | 2730 fps | 95.8% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,295 psi | 69% | 2713 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,003 psi | 66% | 2635 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,767 psi | 58% | 2684 fps | 95.9% |
| Hodgdon Superformance | <<locked>> | 80% | 47,674 psi | 75% | 2818 fps | 99.2% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,891 psi | 44% | 1624 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,338 psi | 69% | 2674 fps | 98.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,415 psi | 79% | 2772 fps | 99.5% |
| IMR 4831 | <<locked>> | 80% | 44,179 psi | 69% | 2687 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,772 psi | 69% | 2667 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 86% | 40,640 psi | 64% | 2697 fps | 95.2% |
| Lovex S065 | <<locked>> | 80% | 47,921 psi | 75% | 2720 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,209 psi | 72% | 2710 fps | 99.2% |
| Lovex S071 | <<locked>> | 80% | 29,892 psi | 47% | 2365 fps | 95.4% |
| Norma 204 | <<locked>> | 80% | 44,382 psi | 70% | 2713 fps | 97.4% |
| Norma 217 | <<locked>> | 96% | 34,940 psi | 55% | 2628 fps | 96% |
| Norma MRP | 60.6 gr | 80% | 36,158 psi | 57% | 2615 fps | 96.6% |
| Norma URP | <<locked>> | 80% | 45,440 psi | 71% | 2730 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 40,379 psi | 63% | 2707 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 44,222 psi | 69% | 2723 fps | 99.3% |
| Ramshot Magnum | <<locked>> | 86% | 36,071 psi | 57% | 2585 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,384 psi | 44% | 1660 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,282 psi | 73% | 2762 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,411 psi | 70% | 2776 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,649 psi | 53% | 2595 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,424 psi | 68% | 2812 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 53,301 psi | 84% | 2805 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,972 psi | 63% | 2595 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 80% | 38,000 psi | 60% | 2595 fps | 95.9% |
| Rottweil R 907 | <<locked>> | 80% | 49,023 psi | 77% | 2746 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,921 psi | 75% | 2720 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,209 psi | 72% | 2710 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,243 psi | 83% | 2680 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,949 psi | 74% | 2671 fps | 99.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,666 psi | 59% | 2589 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 53,127 psi | 83% | 2799 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,540 psi | 68% | 2641 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 42,409 psi | 66% | 2684 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,638 psi | 61% | 2579 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 50,807 psi | 80% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,007 psi | 74% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,766 psi | 56% | 2507 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,238 psi | 72% | 2726 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,304 psi | 58% | 2592 fps | 99.5% |
| Vihtavuori N560 | 63.6 gr | 84% | 41,727 psi | 65% | 2730 fps | 95% |
| Vihtavuori N565 | <<locked>> | 90% | 41,916 psi | 66% | 2720 fps | 95.4% |
| Vihtavuori N568 | <<locked>> | 98% | 48,080 psi | 75% | 2890 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,021 psi | 72% | 2687 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,080 psi | 75% | 2795 fps | 99.4% |
| Winchester StaBALL HD | 59.9 gr | 80% | 29,515 psi | 46% | 2526 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,826 psi | 59% | 2562 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 76 powders for 7 mm Weath. Mag. loaded with the .284 | 158gr | Prvi Partizan Grom. Hodgdon Retumbo delivers the highest muzzle velocity at 3,074 fps; across all powders the maximum-charge window runs from 1,818 fps to 3,074 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 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. Winchester StaBALL HD, Vihtavuori N560, Norma MRP rank at the top here: for 7 mm Weath. Mag. 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.