Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 155gr | Geco EXPRESS 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% | 54,897 psi | 86% | 2894 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,028 psi | 88% | 2923 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 57,261 psi | 90% | 3045 fps | 98% |
| ADI AR 2208 | <<locked>> | 82% | 57,101 psi | 89% | 2884 fps | 100% |
| ADI AR 2209 | <<locked>> | 92% | 56,797 psi | 89% | 2979 fps | 99.4% |
| ADI AR 2213 | <<locked>> | 94% | 54,607 psi | 86% | 2982 fps | 98.4% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 48,878 psi | 77% | 2877 fps | 97.6% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 43,627 psi | 68% | 2835 fps | 99.1% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,072 psi | 89% | 2979 fps | 99.4% |
| Alliant Power Pro Varmint | <<locked>> | 92% | 57,072 psi | 89% | 2979 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 88% | 56,898 psi | 89% | 2982 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 54,462 psi | 85% | 2943 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 56,362 psi | 88% | 2969 fps | 99.4% |
| Alliant Reloder-22 | <<locked>> | 94% | 54,636 psi | 86% | 2979 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 96% | 55,796 psi | 87% | 2953 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 54,984 psi | 86% | 3012 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 56,231 psi | 88% | 3045 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 56,434 psi | 88% | 2940 fps | 96% |
| Bofors RP15 | <<locked>> | 98% | 57,305 psi | 90% | 3022 fps | 99.5% |
| Bofors RP30ᴾ | <<locked>> | 100% | 51,024 psi | 80% | 2946 fps | 98.3% |
| Bofors RP5 | <<locked>> | 94% | 54,636 psi | 86% | 2979 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 55,042 psi | 86% | 2871 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 53,896 psi | 84% | 2966 fps | 99% |
| Hodgdon H414 | <<locked>> | 84% | 54,157 psi | 85% | 2923 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 84% | 56,898 psi | 89% | 2940 fps | 99.5% |
| Hodgdon H4831 | <<locked>> | 92% | 54,636 psi | 86% | 2923 fps | 97.8% |
| Hodgdon H4831 SC | <<locked>> | 94% | 57,203 psi | 90% | 2963 fps | 98.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 57,232 psi | 90% | 2904 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 53,940 psi | 85% | 3081 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 84% | 54,346 psi | 85% | 2956 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,072 psi | 58% | 1834 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 56,608 psi | 89% | 2910 fps | 99.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 56,434 psi | 88% | 2897 fps | 99.9% |
| IMR 4831 | <<locked>> | 88% | 56,507 psi | 89% | 2917 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 55,550 psi | 87% | 2904 fps | 98.1% |
| IMR 7828 SSC | <<locked>> | 96% | 56,159 psi | 88% | 3018 fps | 98.7% |
| Lovex S065 | <<locked>> | 86% | 57,043 psi | 89% | 2894 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,259 psi | 87% | 2890 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 55,898 psi | 88% | 2907 fps | 100% |
| Norma 204 | <<locked>> | 88% | 57,609 psi | 90% | 2969 fps | 99.4% |
| Norma 217ᴾ | <<locked>> | 100% | 39,233 psi | 61% | 2756 fps | 97.4% |
| Norma MRP | <<locked>> | 92% | 54,375 psi | 85% | 2999 fps | 99.8% |
| Norma URP | <<locked>> | 86% | 54,636 psi | 86% | 2910 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 56,913 psi | 89% | 3041 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 88% | 57,058 psi | 89% | 2966 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 55,201 psi | 87% | 2972 fps | 99.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,942 psi | 59% | 1877 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,043 psi | 88% | 2946 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 54,317 psi | 85% | 2972 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3081 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 2956 fps | 96.6% |
| Rottweil R 903 | <<locked>> | 82% | 56,318 psi | 88% | 2874 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 54,462 psi | 85% | 2890 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 92% | 55,898 psi | 88% | 2959 fps | 99.4% |
| Rottweil R 907 | <<locked>> | 84% | 55,042 psi | 86% | 2871 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,043 psi | 89% | 2894 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,259 psi | 87% | 2890 fps | 99.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,072 psi | 88% | 2743 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,318 psi | 88% | 2848 fps | 99.9% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 55,448 psi | 87% | 2953 fps | 99.3% |
| Somchem S355 | <<locked>> | 82% | 55,782 psi | 87% | 2864 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,999 psi | 88% | 2887 fps | 98% |
| Somchem S365 | <<locked>> | 88% | 55,071 psi | 86% | 2913 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 56,333 psi | 88% | 2930 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 84% | 57,072 psi | 89% | 2838 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 56,231 psi | 88% | 2897 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 55,898 psi | 88% | 2910 fps | 99.6% |
| Vihtavuori N550 | <<locked>> | 86% | 55,506 psi | 87% | 2907 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 54,534 psi | 85% | 2930 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 54,244 psi | 85% | 2992 fps | 98% |
| Vihtavuori N565 | <<locked>> | 98% | 54,070 psi | 85% | 2972 fps | 98.2% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 50,792 psi | 80% | 2966 fps | 96.3% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 55,811 psi | 87% | 2858 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,157 psi | 85% | 2923 fps | 99.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 57,595 psi | 90% | 3091 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 56,318 psi | 88% | 2927 fps | 99.3% |
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% | 34,185 psi | 54% | 2497 fps | 96.9% |
| Accurate 4350 | <<locked>> | 80% | 45,832 psi | 72% | 2759 fps | 100% |
| Accurate MAGPRO | <<locked>> | 88% | 46,224 psi | 72% | 2848 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 53,708 psi | 84% | 2831 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,232 psi | 60% | 2625 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 86% | 41,640 psi | 65% | 2733 fps | 95.1% |
| ADI AR 2217 | <<locked>> | 96% | 42,931 psi | 67% | 2756 fps | 95.9% |
| ADI AR 2225 | <<locked>> | 92% | 33,721 psi | 53% | 2585 fps | 95.7% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,595 psi | 60% | 2628 fps | 95.6% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 38,595 psi | 60% | 2628 fps | 95.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 43,874 psi | 69% | 2762 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 50,575 psi | 79% | 2884 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,232 psi | 60% | 2621 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,477 psi | 57% | 2618 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,750 psi | 51% | 2523 fps | 99.4% |
| Alliant Reloder-25 | <<locked>> | 82% | 30,487 psi | 48% | 2487 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 80% | 35,737 psi | 56% | 2661 fps | 98.7% |
| Baschieri & Pellagri 109 | <<locked>> | 94% | 53,142 psi | 83% | 2884 fps | 95.2% |
| Bofors RP15 | <<locked>> | 86% | 38,754 psi | 61% | 2671 fps | 95.7% |
| Bofors RP30 | <<locked>> | 92% | 38,856 psi | 61% | 2703 fps | 95% |
| Bofors RP5 | <<locked>> | 82% | 36,477 psi | 57% | 2618 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 48,443 psi | 76% | 2759 fps | 98.9% |
| Hodgdon H1000 | <<locked>> | 92% | 41,147 psi | 64% | 2717 fps | 96% |
| Hodgdon H414 | <<locked>> | 80% | 47,398 psi | 74% | 2805 fps | 99.2% |
| Hodgdon H4350 | <<locked>> | 80% | 49,908 psi | 78% | 2822 fps | 98.7% |
| Hodgdon H4831 | <<locked>> | 86% | 44,454 psi | 70% | 2740 fps | 95.4% |
| Hodgdon H4831 SC | <<locked>> | 86% | 43,656 psi | 68% | 2723 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,394 psi | 65% | 2648 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,143 psi | 57% | 2687 fps | 95.3% |
| Hodgdon Superformance | <<locked>> | 80% | 46,934 psi | 74% | 2828 fps | 98.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,775 psi | 44% | 1637 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,976 psi | 69% | 2690 fps | 98.2% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,806 psi | 78% | 2785 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 43,540 psi | 68% | 2703 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 43,395 psi | 68% | 2680 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 88% | 42,888 psi | 67% | 2769 fps | 95.7% |
| Lovex S065 | <<locked>> | 80% | 47,369 psi | 74% | 2733 fps | 99.7% |
| Lovex S070 | <<locked>> | 80% | 45,643 psi | 72% | 2723 fps | 99% |
| Lovex S071 | <<locked>> | 82% | 31,415 psi | 49% | 2425 fps | 95.8% |
| Norma 204 | <<locked>> | 80% | 43,947 psi | 69% | 2726 fps | 97.1% |
| Norma 217 | <<locked>> | 96% | 34,432 psi | 54% | 2635 fps | 95.4% |
| Norma MRP | 60.7 gr | 80% | 35,534 psi | 56% | 2621 fps | 96.2% |
| Norma URP | <<locked>> | 80% | 44,773 psi | 70% | 2740 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 39,697 psi | 62% | 2713 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 43,787 psi | 69% | 2740 fps | 99.1% |
| Ramshot Magnum | <<locked>> | 86% | 35,447 psi | 56% | 2589 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,427 psi | 45% | 1680 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 45,788 psi | 72% | 2779 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 43,918 psi | 69% | 2792 fps | 99.8% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,040 psi | 52% | 2595 fps | 95.1% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 45,905 psi | 72% | 2884 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 52,634 psi | 82% | 2818 fps | 100% |
| Rottweil R 904 | <<locked>> | 82% | 42,221 psi | 66% | 2664 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 80% | 37,434 psi | 59% | 2602 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 48,443 psi | 76% | 2759 fps | 98.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,369 psi | 74% | 2733 fps | 99.7% |
| Shooters World SW4350 | <<locked>> | 80% | 45,643 psi | 72% | 2723 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 52,692 psi | 83% | 2697 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,369 psi | 73% | 2684 fps | 99% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,101 psi | 58% | 2598 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 52,518 psi | 82% | 2815 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 45,977 psi | 72% | 2713 fps | 95.8% |
| Somchem S365 | <<locked>> | 80% | 41,945 psi | 66% | 2700 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,058 psi | 60% | 2589 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 80% | 50,183 psi | 79% | 2736 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,354 psi | 73% | 2740 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,201 psi | 55% | 2516 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 45,571 psi | 71% | 2740 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 36,709 psi | 58% | 2602 fps | 99.3% |
| Vihtavuori N560 | 65.3 gr | 86% | 44,164 psi | 69% | 2805 fps | 95.6% |
| Vihtavuori N565 | <<locked>> | 92% | 44,092 psi | 69% | 2785 fps | 95.8% |
| Vihtavuori N568 | <<locked>> | 98% | 47,355 psi | 74% | 2897 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,353 psi | 71% | 2700 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 47,616 psi | 75% | 2808 fps | 99.2% |
| Winchester StaBALL HD | 60.1 gr | 80% | 29,124 psi | 46% | 2536 fps | 99.5% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,260 psi | 58% | 2569 fps | 95.2% |
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 | 155gr | Geco EXPRESS. Winchester StaBALL HD delivers the highest muzzle velocity at 3,091 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,091 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 155.0 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 | 155gr | Geco EXPRESS 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.