Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 156gr | Lapua Naturalis bullet and 75 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, 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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Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 56,057 psi | 88% | 2897 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 57,392 psi | 90% | 2933 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,305 psi | 90% | 3048 fps | 98.9% |
| Accurate MAGPRO | <<locked>> | 92% | 54,375 psi | 85% | 2989 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 82% | 57,711 psi | 90% | 2881 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 57,740 psi | 90% | 2986 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 55,405 psi | 87% | 2986 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,937 psi | 78% | 2884 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,585 psi | 70% | 2844 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 88% | 57,696 psi | 90% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,114 psi | 86% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,130 psi | 90% | 2969 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,579 psi | 87% | 2986 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,768 psi | 89% | 2959 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 55,782 psi | 87% | 3015 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,188 psi | 90% | 3048 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,014 psi | 89% | 2943 fps | 96% |
| Bofors RP15 | <<locked>> | 96% | 54,520 psi | 85% | 2966 fps | 99.1% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,996 psi | 81% | 2956 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 55,579 psi | 87% | 2986 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 55,912 psi | 88% | 2874 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,723 psi | 86% | 2969 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 55,143 psi | 86% | 2927 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 57,421 psi | 90% | 2933 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 55,463 psi | 87% | 2923 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,215 psi | 85% | 2904 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,636 psi | 86% | 2854 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 54,752 psi | 86% | 3087 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 55,172 psi | 86% | 2959 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,246 psi | 58% | 1827 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,232 psi | 90% | 2910 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,116 psi | 90% | 2897 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 57,435 psi | 90% | 2920 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,507 psi | 89% | 2910 fps | 98.2% |
| IMR 7828 SSC | <<locked>> | 96% | 57,000 psi | 89% | 3022 fps | 98.8% |
| Lovex S065 | <<locked>> | 84% | 54,708 psi | 86% | 2848 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 56,115 psi | 88% | 2894 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 57,130 psi | 90% | 2913 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,563 psi | 86% | 2910 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 40,379 psi | 63% | 2772 fps | 97.7% |
| Norma MRP | <<locked>> | 92% | 55,448 psi | 87% | 3009 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 55,390 psi | 87% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 53,896 psi | 84% | 2982 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 86% | 54,215 psi | 85% | 2913 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,217 psi | 88% | 2979 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 38,189 psi | 60% | 1873 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 57,305 psi | 90% | 2953 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,085 psi | 86% | 2979 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,651 psi | 87% | 3087 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,618 psi | 79% | 2966 fps | 96.8% |
| Rottweil R 903 | <<locked>> | 82% | 57,435 psi | 90% | 2877 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,347 psi | 87% | 2897 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 56,768 psi | 89% | 2959 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,912 psi | 88% | 2874 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 54,708 psi | 86% | 2848 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 56,115 psi | 88% | 2894 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,913 psi | 89% | 2746 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 57,406 psi | 90% | 2851 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,318 psi | 88% | 2956 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 57,000 psi | 89% | 2871 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,913 psi | 89% | 2890 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 55,956 psi | 88% | 2917 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,377 psi | 90% | 2936 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 82% | 54,534 psi | 85% | 2789 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,174 psi | 90% | 2900 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,927 psi | 89% | 2913 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 56,594 psi | 89% | 2910 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,709 psi | 87% | 2936 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,216 psi | 87% | 2999 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 55,201 psi | 87% | 2982 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,634 psi | 81% | 2969 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,608 psi | 89% | 2861 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 55,143 psi | 86% | 2927 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,259 psi | 85% | 3041 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,276 psi | 90% | 2930 fps | 99.4% |
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% | 35,679 psi | 56% | 2520 fps | 97.4% |
| Accurate 4350 | <<locked>> | 80% | 47,166 psi | 74% | 2769 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 40,814 psi | 64% | 2736 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 88% | 47,297 psi | 74% | 2858 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 54,288 psi | 85% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 39,073 psi | 61% | 2635 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 42,627 psi | 67% | 2743 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 94% | 41,060 psi | 64% | 2700 fps | 95.1% |
| ADI AR 2225 | <<locked>> | 90% | 32,735 psi | 51% | 2546 fps | 95% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,657 psi | 70% | 2769 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,474 psi | 81% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 39,146 psi | 61% | 2631 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 37,565 psi | 59% | 2635 fps | 95.3% |
| Alliant Reloder-23 | <<locked>> | 80% | 33,982 psi | 53% | 2546 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 29,747 psi | 47% | 2451 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 37,043 psi | 58% | 2680 fps | 99% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,722 psi | 84% | 2884 fps | 95.2% |
| Bofors RP15 | <<locked>> | 84% | 37,246 psi | 58% | 2625 fps | 95% |
| Bofors RP30 | <<locked>> | 92% | 40,030 psi | 63% | 2723 fps | 95.4% |
| Bofors RP5 | <<locked>> | 82% | 37,565 psi | 59% | 2635 fps | 95.3% |
| Bofors RP7 | <<locked>> | 80% | 49,545 psi | 78% | 2769 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 39,378 psi | 62% | 2667 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 48,356 psi | 76% | 2812 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 50,633 psi | 79% | 2822 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 45,455 psi | 71% | 2746 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,643 psi | 70% | 2730 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 42,511 psi | 67% | 2657 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 37,318 psi | 58% | 2707 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 47,761 psi | 75% | 2831 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 28,021 psi | 44% | 1634 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,788 psi | 70% | 2697 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,488 psi | 79% | 2785 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 44,860 psi | 70% | 2717 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 44,222 psi | 69% | 2687 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 43,758 psi | 69% | 2779 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 48,530 psi | 76% | 2743 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 46,862 psi | 73% | 2733 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 31,009 psi | 49% | 2402 fps | 95.6% |
| Norma 204 | <<locked>> | 80% | 44,846 psi | 70% | 2733 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 35,592 psi | 56% | 2654 fps | 95.9% |
| Norma MRP | 59.7 gr | 80% | 36,695 psi | 57% | 2641 fps | 96.5% |
| Norma URP | <<locked>> | 80% | 45,934 psi | 72% | 2753 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 40,886 psi | 64% | 2726 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 44,715 psi | 70% | 2746 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 36,593 psi | 57% | 2605 fps | 95.9% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,732 psi | 45% | 1677 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,934 psi | 74% | 2789 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,889 psi | 70% | 2802 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 34,272 psi | 54% | 2621 fps | 95.7% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 46,934 psi | 74% | 2897 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 53,998 psi | 85% | 2828 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 43,047 psi | 67% | 2671 fps | 95.7% |
| Rottweil R 905 | <<locked>> | 80% | 38,638 psi | 61% | 2621 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 80% | 49,545 psi | 78% | 2769 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 48,530 psi | 76% | 2743 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 46,862 psi | 73% | 2733 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,505 psi | 84% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 47,384 psi | 74% | 2687 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 38,305 psi | 60% | 2615 fps | 95.7% |
| Somchem S355 | <<locked>> | 80% | 53,693 psi | 84% | 2822 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 44,005 psi | 69% | 2661 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 43,033 psi | 67% | 2710 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 39,233 psi | 61% | 2602 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 51,343 psi | 80% | 2743 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 47,253 psi | 74% | 2743 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 36,448 psi | 57% | 2533 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 46,847 psi | 73% | 2749 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 38,189 psi | 60% | 2625 fps | 99.5% |
| Vihtavuori N560 | 64.2 gr | 86% | 45,107 psi | 71% | 2815 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 90% | 42,424 psi | 66% | 2743 fps | 95.2% |
| Vihtavuori N568 | <<locked>> | 98% | 48,182 psi | 76% | 2904 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 46,282 psi | 73% | 2703 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,544 psi | 76% | 2815 fps | 99.3% |
| Winchester StaBALL HD | 59.1 gr | 80% | 30,400 psi | 48% | 2566 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 38,319 psi | 60% | 2582 fps | 95.5% |
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 80 powders for 7 mm Weath. Mag. loaded with the .284 | 156gr | Lapua Naturalis. Hodgdon Retumbo delivers the highest muzzle velocity at 3,087 fps; across all powders the maximum-charge window runs from 1,827 fps to 3,087 fps. ADI AR 2217 gives the best case fill at 100 %, and 80 of the 80 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 155.0 gr projectile in 0.284" calls for a 1:10.0 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, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm Weath. Mag. with the .284 | 156gr | Lapua Naturalis they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Alliant Reloder-33, IMR 7977 Enduron, Vihtavuori N170 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.