Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 150gr | Sierra GameKing 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, 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% | 54,578 psi | 86% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 55,999 psi | 88% | 2972 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 56,057 psi | 88% | 3084 fps | 98.6% |
| Accurate MAGPRO | <<locked>> | 94% | 56,971 psi | 89% | 3087 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 82% | 56,840 psi | 89% | 2930 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,826 psi | 89% | 3028 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 54,534 psi | 85% | 3028 fps | 98.2% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,907 psi | 77% | 2920 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,569 psi | 68% | 2874 fps | 98.9% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,913 psi | 89% | 3031 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,186 psi | 85% | 2986 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,159 psi | 88% | 3015 fps | 99.2% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,505 psi | 85% | 3022 fps | 99.1% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,709 psi | 87% | 3002 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,998 psi | 86% | 3058 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,217 psi | 88% | 3091 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 57,130 psi | 90% | 3068 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,010 psi | 80% | 2992 fps | 98.1% |
| Bofors RP5 | <<locked>> | 94% | 54,505 psi | 85% | 3022 fps | 99.1% |
| Bofors RP7 | <<locked>> | 84% | 54,694 psi | 86% | 2913 fps | 99.5% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,853 psi | 84% | 3012 fps | 98.9% |
| Hodgdon H414 | <<locked>> | 86% | 57,551 psi | 90% | 3025 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 56,681 psi | 89% | 2982 fps | 99.4% |
| Hodgdon H4831 | <<locked>> | 92% | 54,389 psi | 85% | 2963 fps | 97.6% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,116 psi | 90% | 3009 fps | 98% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,188 psi | 90% | 2949 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,896 psi | 84% | 3127 fps | 99.7% |
| Hodgdon Superformance | <<locked>> | 84% | 54,317 psi | 85% | 3002 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,999 psi | 58% | 1870 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,333 psi | 88% | 2956 fps | 99.7% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,072 psi | 88% | 2940 fps | 99.8% |
| IMR 4831 | <<locked>> | 88% | 56,159 psi | 88% | 2959 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,637 psi | 87% | 2953 fps | 98% |
| IMR 7828 SSC | <<locked>> | 96% | 55,999 psi | 88% | 3064 fps | 98.5% |
| Lovex S065 | <<locked>> | 86% | 56,855 psi | 89% | 2940 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,071 psi | 86% | 2933 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,593 psi | 87% | 2949 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,435 psi | 90% | 3012 fps | 99.2% |
| Norma 217ᴾ | <<locked>> | 100% | 39,015 psi | 61% | 2789 fps | 97% |
| Norma MRP | <<locked>> | 92% | 54,244 psi | 85% | 3045 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 54,433 psi | 85% | 2953 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,927 psi | 89% | 3087 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 56,855 psi | 89% | 3012 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,100 psi | 86% | 3018 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,840 psi | 59% | 1916 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 57,682 psi | 90% | 3031 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 55,869 psi | 88% | 2992 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,099 psi | 85% | 3018 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,520 psi | 85% | 3123 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,501 psi | 78% | 2999 fps | 96.4% |
| Rottweil R 903 | <<locked>> | 82% | 55,999 psi | 88% | 2917 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,331 psi | 85% | 2936 fps | 98.2% |
| Rottweil R 905 | <<locked>> | 92% | 55,709 psi | 87% | 3002 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 54,694 psi | 86% | 2913 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 56,855 psi | 89% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,071 psi | 86% | 2933 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 57,609 psi | 90% | 2979 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 55,898 psi | 88% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,101 psi | 88% | 2890 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,274 psi | 87% | 2999 fps | 99.2% |
| Somchem S355 | <<locked>> | 82% | 55,782 psi | 87% | 2913 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,883 psi | 88% | 2930 fps | 97.8% |
| Somchem S365 | <<locked>> | 88% | 54,694 psi | 86% | 2956 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,318 psi | 88% | 2976 fps | 99.7% |
| Vihtavuori N150 | <<locked>> | 84% | 56,913 psi | 89% | 2884 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,188 psi | 88% | 2946 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,782 psi | 87% | 2953 fps | 99.5% |
| Vihtavuori N550 | <<locked>> | 86% | 55,405 psi | 87% | 2953 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,346 psi | 85% | 2972 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,114 psi | 85% | 3038 fps | 97.8% |
| Vihtavuori N565 | <<locked>> | 98% | 53,998 psi | 85% | 3015 fps | 98% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,589 psi | 79% | 3002 fps | 96% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,593 psi | 87% | 2904 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,172 psi | 85% | 2972 fps | 99.7% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,406 psi | 90% | 3140 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,202 psi | 88% | 2972 fps | 99.2% |
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% | 33,968 psi | 53% | 2530 fps | 96.6% |
| Accurate 4350 | <<locked>> | 80% | 45,571 psi | 71% | 2799 fps | 99.9% |
| Accurate High Country | <<locked>> | 84% | 42,366 psi | 66% | 2822 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 88% | 46,137 psi | 72% | 2887 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 53,519 psi | 84% | 2877 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,029 psi | 60% | 2661 fps | 95.1% |
| ADI AR 2213 | <<locked>> | 88% | 44,498 psi | 70% | 2838 fps | 95.8% |
| ADI AR 2217 | <<locked>> | 96% | 42,656 psi | 67% | 2789 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 92% | 33,591 psi | 53% | 2618 fps | 95.2% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,714 psi | 69% | 2805 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,386 psi | 79% | 2927 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,014 psi | 60% | 2657 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 84% | 38,914 psi | 61% | 2717 fps | 95.6% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,561 psi | 51% | 2559 fps | 99.2% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,385 psi | 48% | 2520 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,650 psi | 56% | 2697 fps | 98.5% |
| Bofors RP15 | <<locked>> | 86% | 38,566 psi | 60% | 2707 fps | 95.3% |
| Bofors RP30 | <<locked>> | 94% | 41,452 psi | 65% | 2802 fps | 95.6% |
| Bofors RP5 | <<locked>> | 84% | 38,914 psi | 61% | 2717 fps | 95.6% |
| Bofors RP7 | <<locked>> | 80% | 48,283 psi | 76% | 2802 fps | 98.8% |
| Hodgdon H1000 | <<locked>> | 92% | 40,915 psi | 64% | 2753 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 80% | 47,282 psi | 74% | 2848 fps | 99% |
| Hodgdon H4350 | <<locked>> | 80% | 49,821 psi | 78% | 2864 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 86% | 44,396 psi | 70% | 2782 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 88% | 46,644 psi | 73% | 2825 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,220 psi | 65% | 2687 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 38,522 psi | 60% | 2792 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 46,833 psi | 73% | 2871 fps | 98.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,702 psi | 43% | 1673 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,758 psi | 69% | 2730 fps | 97.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,617 psi | 78% | 2828 fps | 99.2% |
| IMR 4831 | <<locked>> | 80% | 43,323 psi | 68% | 2743 fps | 99.8% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,265 psi | 68% | 2723 fps | 95% |
| IMR 7828 SSC | <<locked>> | 88% | 42,598 psi | 67% | 2805 fps | 95.3% |
| Lovex S065 | <<locked>> | 80% | 47,181 psi | 74% | 2776 fps | 99.6% |
| Lovex S070 | <<locked>> | 80% | 45,629 psi | 72% | 2769 fps | 98.9% |
| Lovex S071 | <<locked>> | 82% | 31,299 psi | 49% | 2461 fps | 95.5% |
| Norma 204 | <<locked>> | 80% | 43,845 psi | 69% | 2769 fps | 96.8% |
| Norma 217 | <<locked>> | 98% | 36,608 psi | 57% | 2730 fps | 96.1% |
| Norma MRP | 62 gr | 80% | 35,389 psi | 55% | 2661 fps | 95.8% |
| Norma URP | <<locked>> | 80% | 44,759 psi | 70% | 2785 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 42,482 psi | 67% | 2818 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 43,627 psi | 68% | 2779 fps | 99% |
| Ramshot Magnum | <<locked>> | 86% | 35,317 psi | 55% | 2625 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,355 psi | 44% | 1713 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 53,548 psi | 84% | 2972 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,600 psi | 71% | 2818 fps | 99.8% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,729 psi | 69% | 2831 fps | 99.7% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 35,288 psi | 55% | 2700 fps | 95.9% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,890 psi | 72% | 2927 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 52,634 psi | 82% | 2867 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 41,989 psi | 66% | 2703 fps | 95.2% |
| Rottweil R 905 | <<locked>> | 80% | 37,405 psi | 59% | 2641 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,283 psi | 76% | 2802 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,181 psi | 74% | 2776 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 80% | 45,629 psi | 72% | 2769 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 54,027 psi | 85% | 2927 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,576 psi | 82% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,325 psi | 73% | 2726 fps | 98.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,072 psi | 58% | 2638 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 52,286 psi | 82% | 2861 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,876 psi | 72% | 2753 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 41,698 psi | 65% | 2740 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,014 psi | 60% | 2628 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 50,183 psi | 79% | 2785 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,108 psi | 72% | 2779 fps | 99.9% |
| Vihtavuori N165 | <<locked>> | 84% | 37,579 psi | 59% | 2612 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 45,513 psi | 71% | 2782 fps | 99.8% |
| Vihtavuori N555 | <<locked>> | 80% | 36,680 psi | 57% | 2644 fps | 99.2% |
| Vihtavuori N560 | 66.7 gr | 86% | 44,034 psi | 69% | 2844 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 92% | 43,990 psi | 69% | 2828 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 98% | 47,239 psi | 74% | 2940 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,150 psi | 71% | 2740 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,282 psi | 74% | 2848 fps | 99% |
| Winchester StaBALL HD | 61.4 gr | 80% | 29,037 psi | 46% | 2569 fps | 99.3% |
| Winchester Supreme 780 | <<locked>> | 84% | 39,726 psi | 62% | 2667 fps | 95.8% |
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 | 150gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,140 fps; across all powders the maximum-charge window runs from 1,870 fps to 3,140 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 150.0 gr projectile in 0.284" calls for a 1:12.0 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 | 150gr | Sierra GameKing 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.