Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 170gr | Sierra RN Prohunter 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 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 55,999 psi | 88% | 2792 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 57,000 psi | 89% | 2815 fps | 100% |
| Accurate MAGPRO | <<locked>> | 90% | 54,665 psi | 86% | 2887 fps | 98.4% |
| ADI AR 2209 | <<locked>> | 88% | 54,114 psi | 85% | 2822 fps | 99.6% |
| ADI AR 2213 | <<locked>> | 92% | 55,564 psi | 87% | 2887 fps | 99.3% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 53,664 psi | 84% | 2854 fps | 99.3% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 48,167 psi | 75% | 2818 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 84% | 54,346 psi | 85% | 2815 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 57,217 psi | 90% | 2864 fps | 99.8% |
| Alliant Reloder-22 | <<locked>> | 92% | 55,840 psi | 88% | 2881 fps | 99.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 57,435 psi | 90% | 2848 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 98% | 56,855 psi | 89% | 2913 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 88% | 53,896 psi | 84% | 2881 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 56,797 psi | 89% | 2844 fps | 97.3% |
| Bofors RP15 | <<locked>> | 94% | 55,027 psi | 86% | 2867 fps | 99.7% |
| Bofors RP30ᴾ | <<locked>> | 100% | 56,637 psi | 89% | 2923 fps | 99.7% |
| Bofors RP5 | <<locked>> | 92% | 55,840 psi | 88% | 2881 fps | 99.8% |
| Bofors RP7 | <<locked>> | 82% | 55,071 psi | 86% | 2759 fps | 99.9% |
| Hodgdon H1000 | <<locked>> | 98% | 55,201 psi | 87% | 2877 fps | 99.7% |
| Hodgdon H414 | <<locked>> | 82% | 54,752 psi | 86% | 2815 fps | 100% |
| Hodgdon H4350 | <<locked>> | 82% | 57,188 psi | 90% | 2825 fps | 99.9% |
| Hodgdon H4831 | <<locked>> | 90% | 55,419 psi | 87% | 2825 fps | 98.8% |
| Hodgdon H4831 SC | <<locked>> | 90% | 54,186 psi | 85% | 2805 fps | 98.6% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 54,505 psi | 85% | 2743 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 98% | 55,782 psi | 87% | 2992 fps | 100% |
| Hodgdon Superformance | <<locked>> | 82% | 55,230 psi | 87% | 2851 fps | 100% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,333 psi | 59% | 1762 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 56,884 psi | 89% | 2802 fps | 100% |
| IMR 4451 Enduron | <<locked>> | 82% | 56,449 psi | 88% | 2779 fps | 100% |
| IMR 4831 | <<locked>> | 86% | 57,363 psi | 90% | 2805 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 90% | 56,289 psi | 88% | 2808 fps | 99% |
| IMR 7828 SSC | <<locked>> | 94% | 57,653 psi | 90% | 2927 fps | 99.5% |
| IMR 8133 Enduronᴾ | <<locked>> | 100% | 43,714 psi | 69% | 2723 fps | 97.6% |
| Lovex S065 | <<locked>> | 84% | 57,421 psi | 90% | 2779 fps | 100% |
| Lovex S070 | <<locked>> | 84% | 55,811 psi | 87% | 2782 fps | 100% |
| Lovex S071 | <<locked>> | 98% | 57,290 psi | 90% | 2808 fps | 100% |
| Norma 204 | <<locked>> | 84% | 54,331 psi | 85% | 2802 fps | 99.6% |
| Norma 217ᴾ | <<locked>> | 100% | 43,874 psi | 69% | 2746 fps | 99.3% |
| Norma MRP | <<locked>> | 90% | 55,854 psi | 88% | 2900 fps | 100% |
| Norma URP | <<locked>> | 84% | 55,434 psi | 87% | 2799 fps | 100% |
| Ramshot Grand | <<locked>> | 92% | 54,360 psi | 85% | 2887 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 57,696 psi | 90% | 2854 fps | 100% |
| Ramshot Magnum | <<locked>> | 96% | 56,811 psi | 89% | 2881 fps | 100% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,276 psi | 60% | 1804 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 57,159 psi | 90% | 2838 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 84% | 55,376 psi | 87% | 2864 fps | 100% |
| ReloadSwiss RS 76 | <<locked>> | 98% | 56,608 psi | 89% | 2989 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 55,680 psi | 87% | 2943 fps | 98.8% |
| Rottweil R 904 | <<locked>> | 88% | 54,998 psi | 86% | 2789 fps | 99.2% |
| Rottweil R 905 | <<locked>> | 90% | 56,855 psi | 89% | 2854 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 82% | 55,071 psi | 86% | 2759 fps | 99.9% |
| Shooters World Long Rifle | <<locked>> | 84% | 57,421 psi | 90% | 2779 fps | 100% |
| Shooters World SW4350 | <<locked>> | 84% | 55,811 psi | 87% | 2782 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 56,608 psi | 89% | 2740 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 90% | 56,434 psi | 88% | 2851 fps | 99.8% |
| Somchem S361 | <<locked>> | 88% | 56,594 psi | 89% | 2789 fps | 98.9% |
| Somchem S365 | <<locked>> | 86% | 56,028 psi | 88% | 2799 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 57,246 psi | 90% | 2825 fps | 100% |
| Vihtavuori N150 | <<locked>> | 82% | 57,450 psi | 90% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 56,942 psi | 89% | 2785 fps | 100% |
| Vihtavuori N165 | <<locked>> | 94% | 57,087 psi | 89% | 2815 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 56,231 psi | 88% | 2795 fps | 100% |
| Vihtavuori N555 | <<locked>> | 90% | 55,796 psi | 87% | 2822 fps | 100% |
| Vihtavuori N560 | <<locked>> | 90% | 55,550 psi | 87% | 2900 fps | 99% |
| Vihtavuori N565 | <<locked>> | 96% | 55,564 psi | 87% | 2884 fps | 99.1% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 56,347 psi | 88% | 2943 fps | 98.5% |
| Vihtavuori N570ᴾ | <<locked>> | 100% | 53,229 psi | 83% | 2933 fps | 96.1% |
| Winchester 6.5 StaBALL | <<locked>> | 84% | 56,347 psi | 88% | 2743 fps | 100% |
| Winchester 760 | <<locked>> | 82% | 54,984 psi | 86% | 2815 fps | 100% |
| Winchester StaBALL HD | <<locked>> | 94% | 55,898 psi | 88% | 2933 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 57,145 psi | 90% | 2825 fps | 99.8% |
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% | 37,536 psi | 59% | 2470 fps | 98.8% |
| Accurate 4350 | <<locked>> | 80% | 49,908 psi | 78% | 2707 fps | 100% |
| Accurate MAGPRO | <<locked>> | 82% | 41,118 psi | 64% | 2635 fps | 95.1% |
| ADI AR 2209 | <<locked>> | 80% | 41,510 psi | 65% | 2592 fps | 97.6% |
| ADI AR 2213 | <<locked>> | 82% | 39,595 psi | 62% | 2585 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 90% | 38,334 psi | 60% | 2556 fps | 95.7% |
| ADI AR 2225 | <<locked>> | 86% | 30,400 psi | 48% | 2402 fps | 95.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 47,790 psi | 75% | 2713 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 41,510 psi | 65% | 2589 fps | 97.7% |
| Alliant Reloder-22 | <<locked>> | 80% | 37,333 psi | 59% | 2533 fps | 96.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 36,100 psi | 57% | 2493 fps | 100% |
| Alliant Reloder-25 | <<locked>> | 80% | 31,299 psi | 49% | 2415 fps | 97.8% |
| Alliant Reloder-26 | <<locked>> | 80% | 40,001 psi | 63% | 2641 fps | 99.9% |
| Baschieri & Pellagri 109 | <<locked>> | 88% | 47,268 psi | 74% | 2677 fps | 95% |
| Bofors RP15 | <<locked>> | 80% | 34,708 psi | 54% | 2470 fps | 95.4% |
| Bofors RP30 | <<locked>> | 88% | 37,753 psi | 59% | 2572 fps | 95.9% |
| Bofors RP5 | <<locked>> | 80% | 37,333 psi | 59% | 2533 fps | 96.5% |
| Bofors RP7 | <<locked>> | 80% | 51,851 psi | 81% | 2707 fps | 99.8% |
| Hodgdon H1000 | <<locked>> | 86% | 36,608 psi | 57% | 2516 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 51,285 psi | 80% | 2759 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 80% | 53,606 psi | 84% | 2769 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 80% | 39,494 psi | 62% | 2530 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 82% | 41,524 psi | 65% | 2575 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 45,049 psi | 71% | 2595 fps | 100% |
| Hodgdon Retumbo | 60.5 gr | 82% | 32,634 psi | 51% | 2493 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 51,372 psi | 81% | 2792 fps | 99.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,065 psi | 44% | 1575 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 47,311 psi | 74% | 2648 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 53,156 psi | 83% | 2730 fps | 100% |
| IMR 4831 | <<locked>> | 80% | 47,210 psi | 74% | 2654 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 80% | 41,104 psi | 64% | 2533 fps | 95.9% |
| IMR 7828 SSC | <<locked>> | 82% | 38,189 psi | 60% | 2562 fps | 95.4% |
| IMR 8133 Enduron | <<locked>> | 96% | 38,203 psi | 60% | 2605 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 50,749 psi | 80% | 2680 fps | 100% |
| Lovex S070 | <<locked>> | 80% | 49,066 psi | 77% | 2674 fps | 99.8% |
| Lovex S071 | <<locked>> | 80% | 32,358 psi | 51% | 2352 fps | 97.4% |
| Norma 204 | <<locked>> | 80% | 47,543 psi | 75% | 2687 fps | 98.7% |
| Norma 217 | <<locked>> | 90% | 31,372 psi | 49% | 2451 fps | 95.3% |
| Norma MRP | <<locked>> | 80% | 39,204 psi | 61% | 2602 fps | 98.4% |
| Norma URP | <<locked>> | 80% | 48,501 psi | 76% | 2690 fps | 100% |
| Ramshot Grand | <<locked>> | 82% | 37,826 psi | 59% | 2569 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 47,456 psi | 74% | 2694 fps | 99.9% |
| Ramshot Magnum | <<locked>> | 80% | 31,459 psi | 49% | 2392 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,776 psi | 45% | 1614 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 49,864 psi | 78% | 2730 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 47,993 psi | 75% | 2749 fps | 100% |
| ReloadSwiss RS 76 | 64.7 gr | 82% | 31,589 psi | 50% | 2464 fps | 96% |
| ReloadSwiss RS 80 | <<locked>> | 92% | 41,017 psi | 64% | 2677 fps | 95.3% |
| Rottweil R 904 | <<locked>> | 80% | 42,757 psi | 67% | 2572 fps | 96.9% |
| Rottweil R 905 | <<locked>> | 80% | 40,828 psi | 64% | 2572 fps | 97.7% |
| Rottweil R 907 | <<locked>> | 80% | 51,851 psi | 81% | 2707 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 50,749 psi | 80% | 2680 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 49,066 psi | 77% | 2674 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 49,632 psi | 78% | 2635 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 40,524 psi | 64% | 2569 fps | 97.6% |
| Somchem S361 | <<locked>> | 80% | 43,395 psi | 68% | 2559 fps | 96.3% |
| Somchem S365 | <<locked>> | 80% | 45,992 psi | 72% | 2651 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 41,408 psi | 65% | 2559 fps | 98.5% |
| Vihtavuori N150 | <<locked>> | 80% | 53,809 psi | 84% | 2671 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 50,082 psi | 78% | 2687 fps | 100% |
| Vihtavuori N165 | <<locked>> | 80% | 36,013 psi | 56% | 2434 fps | 96.7% |
| Vihtavuori N550 | <<locked>> | 80% | 49,429 psi | 77% | 2690 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 40,350 psi | 63% | 2566 fps | 100% |
| Vihtavuori N560 | 61.2 gr | 80% | 39,218 psi | 61% | 2589 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 86% | 39,740 psi | 62% | 2592 fps | 95.7% |
| Vihtavuori N568 | <<locked>> | 92% | 42,482 psi | 67% | 2694 fps | 95.1% |
| Vihtavuori N570 | <<locked>> | 98% | 49,617 psi | 78% | 2867 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 49,284 psi | 77% | 2644 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 51,503 psi | 81% | 2762 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 32,634 psi | 51% | 2526 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 80% | 37,869 psi | 59% | 2484 fps | 96.7% |
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 71 powders for 7 mm Weath. Mag. loaded with the .284 | 170gr | Sierra RN Prohunter. Hodgdon Retumbo delivers the highest muzzle velocity at 2,992 fps; across all powders the maximum-charge window runs from 1,762 fps to 2,992 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 (440 MPa), the top charges use 59–90 %, leaving at least 10 % headroom. The 170.0 gr projectile in 0.284" calls for a 1:12.5 twist; slower twists will usually not stabilise this weight. ADI AR 2217, ADI AR 2225, Bofors RP30 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, Vihtavuori N560 rank at the top here: for 7 mm Weath. Mag. with the .284 | 170gr | Sierra RN Prohunter 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.