Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 151gr | Warner Tool Co. Flat Line bullet and 79 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Accurate High Country, 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>> | 96% | 54,186 psi | 85% | 2907 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 56,043 psi | 88% | 2953 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 55,666 psi | 87% | 3061 fps | 98.3% |
| Accurate MAGPRO | <<locked>> | 96% | 56,449 psi | 88% | 3058 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 57,551 psi | 90% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,739 psi | 89% | 3002 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 96% | 54,476 psi | 85% | 3002 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,321 psi | 63% | 2779 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 55,274 psi | 87% | 2887 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,594 psi | 89% | 3005 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 53,998 psi | 85% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,043 psi | 88% | 2989 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 96% | 54,157 psi | 85% | 2999 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,882 psi | 86% | 2976 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,633 psi | 79% | 2972 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,187 psi | 86% | 3064 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,724 psi | 89% | 3038 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 56,144 psi | 88% | 2904 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,659 psi | 73% | 2897 fps | 96.9% |
| Bofors RP5 | <<locked>> | 96% | 54,157 psi | 85% | 2999 fps | 98.9% |
| Bofors RP7 | <<locked>> | 86% | 55,317 psi | 87% | 2900 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 50,067 psi | 78% | 2917 fps | 97.8% |
| Hodgdon H380 | <<locked>> | 82% | 56,173 psi | 88% | 2923 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 54,027 psi | 85% | 2946 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 56,898 psi | 89% | 2959 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 94% | 54,520 psi | 85% | 2943 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 57,174 psi | 90% | 2986 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 57,116 psi | 90% | 2930 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,748 psi | 78% | 3028 fps | 99% |
| Hodgdon Superformance | <<locked>> | 86% | 54,346 psi | 85% | 2986 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1834 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,855 psi | 89% | 2894 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,565 psi | 89% | 2933 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,840 psi | 89% | 2927 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 56,362 psi | 88% | 2943 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,753 psi | 87% | 2927 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,695 psi | 87% | 3035 fps | 98.2% |
| Lovex S062 | <<locked>> | 82% | 57,203 psi | 90% | 2887 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,116 psi | 90% | 2917 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,259 psi | 87% | 2913 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,619 psi | 81% | 2867 fps | 99.8% |
| Norma 204 | <<locked>> | 90% | 57,624 psi | 90% | 2992 fps | 99.1% |
| Norma MRP | <<locked>> | 96% | 57,537 psi | 90% | 3081 fps | 99.9% |
| Norma URP | <<locked>> | 88% | 54,404 psi | 85% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,449 psi | 88% | 3058 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 56,855 psi | 89% | 2992 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,650 psi | 86% | 2989 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,666 psi | 59% | 1880 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 56,028 psi | 88% | 2910 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,435 psi | 90% | 3012 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,912 psi | 88% | 2976 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 54,230 psi | 85% | 3002 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,096 psi | 79% | 3022 fps | 99.7% |
| Rottweil R 903 | <<locked>> | 84% | 56,536 psi | 89% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,418 psi | 85% | 2913 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 94% | 55,434 psi | 87% | 2976 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 86% | 55,317 psi | 87% | 2900 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,116 psi | 90% | 2917 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,203 psi | 90% | 2887 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,259 psi | 87% | 2913 fps | 99.8% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,375 psi | 85% | 2910 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,536 psi | 89% | 2776 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,652 psi | 89% | 2874 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,984 psi | 86% | 2969 fps | 99% |
| Somchem S355 | <<locked>> | 84% | 56,072 psi | 88% | 2897 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,086 psi | 88% | 2907 fps | 97.5% |
| Somchem S365 | <<locked>> | 90% | 54,346 psi | 85% | 2936 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,014 psi | 88% | 2949 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 57,334 psi | 90% | 2867 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,391 psi | 88% | 2930 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,521 psi | 87% | 2927 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 88% | 55,477 psi | 87% | 2933 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,334 psi | 90% | 3002 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,508 psi | 90% | 3074 fps | 98.1% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 2986 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,811 psi | 87% | 2887 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,244 psi | 85% | 2949 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,854 psi | 88% | 3110 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,318 psi | 88% | 2949 fps | 99% |
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% | 31,560 psi | 49% | 2457 fps | 95.3% |
| Accurate 4350 | <<locked>> | 80% | 42,525 psi | 67% | 2723 fps | 99.6% |
| Accurate High Country | 62.4 gr | 86% | 42,061 psi | 66% | 2799 fps | 95% |
| Accurate MAGPRO | <<locked>> | 92% | 49,110 psi | 77% | 2930 fps | 95.7% |
| ADI AR 2208 | <<locked>> | 80% | 50,865 psi | 80% | 2812 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,799 psi | 64% | 2707 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 90% | 44,338 psi | 69% | 2808 fps | 95.3% |
| ADI AR 2225 | <<locked>> | 96% | 35,433 psi | 56% | 2654 fps | 95.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,808 psi | 81% | 2835 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,959 psi | 64% | 2730 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,905 psi | 74% | 2851 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,654 psi | 64% | 2700 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 86% | 38,522 psi | 60% | 2694 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,327 psi | 48% | 2487 fps | 98.4% |
| Alliant Reloder-25 | <<locked>> | 84% | 30,269 psi | 47% | 2500 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 32,808 psi | 51% | 2612 fps | 97.3% |
| Bofors RP15 | <<locked>> | 90% | 40,857 psi | 64% | 2746 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 52,605 psi | 82% | 2851 fps | 100% |
| Bofors RP30 | <<locked>> | 96% | 40,712 psi | 64% | 2772 fps | 95.1% |
| Bofors RP5 | <<locked>> | 86% | 38,522 psi | 60% | 2694 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,818 psi | 72% | 2730 fps | 98.1% |
| Hodgdon H1000 | <<locked>> | 94% | 40,857 psi | 64% | 2730 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 52,663 psi | 83% | 2867 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 44,396 psi | 70% | 2772 fps | 98.3% |
| Hodgdon H4350 | <<locked>> | 80% | 46,963 psi | 74% | 2789 fps | 97.7% |
| Hodgdon H4831 | <<locked>> | 90% | 47,398 psi | 74% | 2815 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,514 psi | 73% | 2799 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,522 psi | 60% | 2618 fps | 99.9% |
| Hodgdon Retumbo | <<locked>> | 92% | 38,203 psi | 60% | 2762 fps | 95.5% |
| Hodgdon Superformance | <<locked>> | 80% | 43,569 psi | 68% | 2792 fps | 97.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,499 psi | 43% | 1640 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,548 psi | 84% | 2844 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,307 psi | 65% | 2657 fps | 97.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,036 psi | 74% | 2756 fps | 98.7% |
| IMR 4831 | <<locked>> | 80% | 40,553 psi | 64% | 2667 fps | 99.4% |
| IMR 4955 Enduron | <<locked>> | 88% | 46,108 psi | 72% | 2756 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 92% | 45,426 psi | 71% | 2848 fps | 95.8% |
| Lovex S062 | <<locked>> | 80% | 53,925 psi | 85% | 2838 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,744 psi | 70% | 2710 fps | 99.2% |
| Lovex S070 | <<locked>> | 80% | 42,989 psi | 67% | 2694 fps | 98.1% |
| Lovex S071 | <<locked>> | 84% | 30,937 psi | 48% | 2438 fps | 95% |
| Norma 204 | <<locked>> | 80% | 40,988 psi | 64% | 2687 fps | 95.6% |
| Norma MRP | 59.5 gr | 82% | 35,230 psi | 55% | 2641 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 41,930 psi | 66% | 2713 fps | 99.5% |
| Ramshot Grand | <<locked>> | 90% | 42,250 psi | 66% | 2789 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 40,712 psi | 64% | 2700 fps | 98.2% |
| Ramshot Magnum | <<locked>> | 90% | 37,681 psi | 59% | 2664 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,152 psi | 44% | 1680 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,359 psi | 82% | 2851 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,777 psi | 78% | 2900 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,482 psi | 67% | 2743 fps | 99.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,683 psi | 64% | 2753 fps | 99.1% |
| ReloadSwiss RS 76 | <<locked>> | 90% | 35,012 psi | 55% | 2671 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 49,545 psi | 78% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,947 psi | 70% | 2743 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 84% | 39,769 psi | 62% | 2680 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,818 psi | 72% | 2730 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,744 psi | 70% | 2710 fps | 99.2% |
| Shooters World Precision | <<locked>> | 80% | 53,925 psi | 85% | 2838 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,989 psi | 67% | 2694 fps | 98.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,734 psi | 80% | 2854 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 50,067 psi | 78% | 2687 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,656 psi | 68% | 2654 fps | 98.2% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 39,436 psi | 62% | 2677 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 49,530 psi | 78% | 2792 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 46,064 psi | 72% | 2733 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 38,667 psi | 61% | 2671 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 35,433 psi | 56% | 2552 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 47,340 psi | 74% | 2720 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,352 psi | 68% | 2710 fps | 99.6% |
| Vihtavuori N165 | <<locked>> | 86% | 37,420 psi | 59% | 2592 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 42,743 psi | 67% | 2710 fps | 99.4% |
| Vihtavuori N555 | <<locked>> | 80% | 33,881 psi | 53% | 2566 fps | 98.4% |
| Vihtavuori N560 | 65.3 gr | 90% | 46,833 psi | 73% | 2884 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 94% | 43,352 psi | 68% | 2799 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,293 psi | 66% | 2671 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,396 psi | 70% | 2772 fps | 98.3% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,847 psi | 42% | 2477 fps | 98% |
| Winchester Supreme 780 | <<locked>> | 86% | 39,653 psi | 62% | 2644 fps | 95.4% |
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 79 powders for 7 mm Weath. Mag. loaded with the .284 | 151gr | Warner Tool Co. Flat Line. Winchester StaBALL HD delivers the highest muzzle velocity at 3,110 fps; across all powders the maximum-charge window runs from 1,834 fps to 3,110 fps. ADI AR 2225 gives the best case fill at 100 %, and 79 of the 79 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 151.0 gr projectile in 0.284" calls for a 1:8.5 twist; slower twists will usually not stabilise this weight. ADI AR 2225, Alliant Reloder-25, Bofors RP15 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. Accurate High Country, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm Weath. Mag. with the .284 | 151gr | Warner Tool Co. Flat Line 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.