Load Specifications
Load data in caliber 7 mm Weath. Mag. with .285 | 173gr | Prvi Partizan SP bullet and 70 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 Accurate MAGPRO.
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>> | 92% | 57,043 psi | 89% | 2782 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 54,201 psi | 85% | 2753 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 55,680 psi | 87% | 2881 fps | 98.7% |
| ADI AR 2209 | <<locked>> | 88% | 55,027 psi | 86% | 2815 fps | 99.8% |
| ADI AR 2213 | <<locked>> | 92% | 56,608 psi | 89% | 2877 fps | 99.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 54,679 psi | 86% | 2851 fps | 99.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 49,139 psi | 77% | 2812 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 55,347 psi | 87% | 2808 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 88% | 54,520 psi | 85% | 2802 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 56,884 psi | 89% | 2874 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 92% | 54,737 psi | 86% | 2789 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 96% | 54,143 psi | 85% | 2851 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 55,085 psi | 86% | 2874 fps | 100% |
| Alliant Reloder-33ᴾ | <<locked>> | 100% | 51,314 psi | 80% | 2864 fps | 96.3% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 57,595 psi | 90% | 2838 fps | 97.7% |
| Bofors RP15 | <<locked>> | 94% | 56,057 psi | 88% | 2861 fps | 99.9% |
| Bofors RP30 | <<locked>> | 98% | 54,012 psi | 85% | 2861 fps | 99.5% |
| Bofors RP5 | <<locked>> | 92% | 56,884 psi | 89% | 2874 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 55,927 psi | 88% | 2749 fps | 100% |
| Hodgdon H1000 | <<locked>> | 98% | 56,246 psi | 88% | 2871 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 82% | 55,695 psi | 87% | 2805 fps | 100% |
| Hodgdon H4831 | <<locked>> | 90% | 56,391 psi | 88% | 2818 fps | 99% |
| Hodgdon H4831 SC | <<locked>> | 90% | 55,143 psi | 86% | 2799 fps | 98.9% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 55,477 psi | 87% | 2730 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 56,942 psi | 89% | 2989 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 56,202 psi | 88% | 2844 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,449 psi | 59% | 1749 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 54,404 psi | 85% | 2743 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 57,261 psi | 90% | 2772 fps | 100% |
| IMR 4831 | <<locked>> | 84% | 54,607 psi | 86% | 2746 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,913 psi | 89% | 2795 fps | 99.2% |
| IMR 7828 SSC | <<locked>> | 92% | 54,824 psi | 86% | 2861 fps | 99.4% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 44,715 psi | 70% | 2720 fps | 98% |
| Lovex S065 | <<locked>> | 82% | 54,723 psi | 86% | 2720 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 56,449 psi | 88% | 2769 fps | 100% |
| Lovex S071 | <<locked>> | 96% | 54,752 psi | 86% | 2753 fps | 100% |
| Norma 204 | <<locked>> | 84% | 55,245 psi | 87% | 2795 fps | 99.7% |
| Norma 217ᴾ | <<locked>> | 100% | 44,947 psi | 70% | 2743 fps | 99.6% |
| Norma MRP | <<locked>> | 90% | 56,956 psi | 89% | 2894 fps | 100% |
| Norma URP | <<locked>> | 84% | 56,115 psi | 88% | 2785 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 55,492 psi | 87% | 2881 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 84% | 55,013 psi | 86% | 2792 fps | 100% |
| Ramshot Magnum | <<locked>> | 94% | 53,969 psi | 85% | 2815 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,392 psi | 60% | 1791 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 54,244 psi | 85% | 2776 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 56,405 psi | 88% | 2854 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 96% | 53,606 psi | 84% | 2920 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 56,942 psi | 89% | 2943 fps | 99.1% |
| Rottweil R 904 | <<locked>> | 88% | 55,883 psi | 88% | 2782 fps | 99.4% |
| Rottweil R 905 | <<locked>> | 88% | 54,128 psi | 85% | 2792 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 55,927 psi | 88% | 2749 fps | 100% |
| Shooters World Long Rifle | <<locked>> | 82% | 54,723 psi | 86% | 2720 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 56,449 psi | 88% | 2769 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 57,159 psi | 90% | 2726 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 57,450 psi | 90% | 2844 fps | 99.9% |
| Somchem S361 | <<locked>> | 88% | 57,479 psi | 90% | 2782 fps | 99.1% |
| Somchem S365 | <<locked>> | 86% | 57,101 psi | 89% | 2789 fps | 100% |
| Somchem S385 | <<locked>> | 88% | 54,549 psi | 85% | 2766 fps | 100% |
| Vihtavuori N160 | <<locked>> | 82% | 54,186 psi | 85% | 2726 fps | 100% |
| Vihtavuori N165 | <<locked>> | 92% | 54,360 psi | 85% | 2753 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 84% | 56,913 psi | 89% | 2782 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 56,869 psi | 89% | 2815 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 56,550 psi | 89% | 2894 fps | 99.2% |
| Vihtavuori N565 | <<locked>> | 96% | 56,637 psi | 89% | 2877 fps | 99.4% |
| Vihtavuori N568 | <<locked>> | 98% | 53,664 psi | 84% | 2881 fps | 98.2% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 54,665 psi | 86% | 2936 fps | 96.7% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 57,232 psi | 90% | 2733 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 55,956 psi | 88% | 2808 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 57,319 psi | 90% | 2927 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 90% | 54,302 psi | 85% | 2762 fps | 99.7% |
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% | 38,276 psi | 60% | 2467 fps | 99.1% |
| Accurate 4350 | <<locked>> | 80% | 50,821 psi | 80% | 2700 fps | 100% |
| Accurate MAGPRO | 64.1 gr | 82% | 42,003 psi | 66% | 2631 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 42,090 psi | 66% | 2585 fps | 98% |
| ADI AR 2213 | <<locked>> | 80% | 37,681 psi | 59% | 2520 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 88% | 36,506 psi | 57% | 2497 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 86% | 30,995 psi | 49% | 2402 fps | 96.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 48,486 psi | 76% | 2703 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 42,293 psi | 66% | 2585 fps | 98% |
| Alliant Reloder-22 | <<locked>> | 80% | 38,116 psi | 60% | 2530 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,883 psi | 58% | 2490 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,792 psi | 50% | 2411 fps | 98.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,930 psi | 64% | 2638 fps | 100% |
| Alliant Reloder-33 | <<locked>> | 98% | 47,645 psi | 75% | 2795 fps | 95.2% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,964 psi | 75% | 2674 fps | 95.5% |
| Bofors RP15 | <<locked>> | 80% | 35,462 psi | 56% | 2467 fps | 95.9% |
| Bofors RP30 | <<locked>> | 86% | 36,042 psi | 56% | 2513 fps | 95.5% |
| Bofors RP5 | <<locked>> | 80% | 38,116 psi | 60% | 2530 fps | 97% |
| Bofors RP7 | <<locked>> | 80% | 52,663 psi | 83% | 2700 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 84% | 34,838 psi | 55% | 2457 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 52,170 psi | 82% | 2749 fps | 100% |
| Hodgdon H4831 | <<locked>> | 80% | 40,205 psi | 63% | 2530 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 80% | 39,479 psi | 62% | 2513 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,658 psi | 72% | 2585 fps | 100% |
| Hodgdon Retumbo | 60.6 gr | 82% | 33,185 psi | 52% | 2493 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 52,083 psi | 82% | 2782 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 1562 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,848 psi | 75% | 2635 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,737 psi | 84% | 2720 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 48,080 psi | 75% | 2644 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,611 psi | 65% | 2523 fps | 96.3% |
| IMR 7828 SSC | <<locked>> | 82% | 38,957 psi | 61% | 2562 fps | 95.9% |
| IMR 8133 Enduron | <<locked>> | 94% | 36,419 psi | 57% | 2543 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 51,547 psi | 81% | 2671 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,864 psi | 78% | 2664 fps | 99.9% |
| Lovex S071 | <<locked>> | 80% | 33,040 psi | 52% | 2349 fps | 97.8% |
| Norma 204 | <<locked>> | 80% | 48,370 psi | 76% | 2684 fps | 99% |
| Norma 217 | <<locked>> | 90% | 32,082 psi | 50% | 2454 fps | 96% |
| Norma MRP | <<locked>> | 80% | 40,045 psi | 63% | 2598 fps | 98.7% |
| Norma URP | <<locked>> | 80% | 49,385 psi | 77% | 2684 fps | 100% |
| Ramshot Grand | <<locked>> | 80% | 35,969 psi | 56% | 2507 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 48,327 psi | 76% | 2687 fps | 100% |
| Ramshot Magnum | <<locked>> | 80% | 32,126 psi | 50% | 2392 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,747 psi | 45% | 1598 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 50,807 psi | 80% | 2723 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 48,979 psi | 77% | 2743 fps | 100% |
| ReloadSwiss RS 76 | 63.3 gr | 80% | 30,023 psi | 47% | 2402 fps | 95.3% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 42,003 psi | 66% | 2680 fps | 95.9% |
| Rottweil R 904 | <<locked>> | 80% | 43,308 psi | 68% | 2566 fps | 97.3% |
| Rottweil R 905 | <<locked>> | 80% | 41,626 psi | 65% | 2569 fps | 98% |
| Rottweil R 907 | <<locked>> | 80% | 52,663 psi | 83% | 2700 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 51,547 psi | 81% | 2671 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,864 psi | 78% | 2664 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 50,415 psi | 79% | 2625 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 41,292 psi | 65% | 2566 fps | 97.9% |
| Somchem S361 | <<locked>> | 80% | 44,092 psi | 69% | 2556 fps | 96.8% |
| Somchem S365 | <<locked>> | 80% | 46,702 psi | 73% | 2638 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 42,163 psi | 66% | 2552 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 80% | 50,952 psi | 80% | 2677 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,738 psi | 58% | 2431 fps | 97.1% |
| Vihtavuori N550 | <<locked>> | 80% | 50,067 psi | 78% | 2680 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 41,205 psi | 65% | 2559 fps | 100% |
| Vihtavuori N560 | <<locked>> | 80% | 40,016 psi | 63% | 2589 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 84% | 37,913 psi | 59% | 2530 fps | 95.3% |
| Vihtavuori N568 | <<locked>> | 92% | 43,424 psi | 68% | 2694 fps | 95.7% |
| Vihtavuori N570 | <<locked>> | 98% | 50,749 psi | 80% | 2867 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,908 psi | 78% | 2631 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 52,170 psi | 82% | 2749 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 80% | 33,591 psi | 53% | 2526 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 38,624 psi | 61% | 2480 fps | 97.1% |
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 70 powders for 7 mm Weath. Mag. loaded with the .285 | 173gr | Prvi Partizan SP. Hodgdon Retumbo delivers the highest muzzle velocity at 2,989 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,989 fps. ADI AR 2217 gives the best case fill at 100 %, and 70 of the 70 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 173.0 gr projectile in 0.285" calls for a 1:12.5 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, Accurate MAGPRO rank at the top here: for 7 mm Weath. Mag. with the .285 | 173gr | Prvi Partizan SP 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.