Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 150gr | Osprey Virtus bullet and 82 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, 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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You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 24"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 2700 | <<locked>> | 82% | 57,406 psi | 90% | 2910 fps | 99.5% |
| Accurate 3100 | <<locked>> | 98% | 57,101 psi | 89% | 2966 fps | 100% |
| Accurate 4064 | <<locked>> | 82% | 57,058 psi | 89% | 2884 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,114 psi | 86% | 2956 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 55,970 psi | 88% | 3064 fps | 97.3% |
| ADI AR 2208 | <<locked>> | 84% | 56,956 psi | 89% | 2923 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,101 psi | 88% | 3009 fps | 99% |
| ADI AR 2213 | <<locked>> | 96% | 53,722 psi | 84% | 3002 fps | 97.7% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,566 psi | 62% | 2776 fps | 97.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,549 psi | 85% | 2894 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,115 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,464 psi | 90% | 3031 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,608 psi | 87% | 2995 fps | 99% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,276 psi | 90% | 3064 fps | 99.3% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,317 psi | 85% | 2979 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,009 psi | 78% | 2972 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,708 psi | 86% | 3071 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 55,840 psi | 88% | 3041 fps | 99% |
| Bofors RP3 | <<locked>> | 82% | 55,405 psi | 87% | 2910 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 45,890 psi | 72% | 2894 fps | 96.7% |
| Bofors RP5 | <<locked>> | 98% | 57,276 psi | 90% | 3064 fps | 99.3% |
| Bofors RP7 | <<locked>> | 86% | 54,505 psi | 85% | 2904 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,429 psi | 77% | 2920 fps | 97.7% |
| Hodgdon H380 | <<locked>> | 82% | 55,579 psi | 87% | 2930 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,217 psi | 90% | 3012 fps | 99.8% |
| Hodgdon H4350 | <<locked>> | 86% | 56,449 psi | 88% | 2969 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 94% | 53,751 psi | 84% | 2946 fps | 97.1% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,420 psi | 88% | 2989 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,478 psi | 89% | 2936 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,037 psi | 77% | 3028 fps | 98.9% |
| Hodgdon Superformance | <<locked>> | 86% | 53,606 psi | 84% | 2986 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,782 psi | 58% | 1847 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,260 psi | 88% | 2904 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,014 psi | 88% | 2940 fps | 99.5% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,202 psi | 88% | 2930 fps | 99.7% |
| IMR 4831 | <<locked>> | 90% | 55,622 psi | 87% | 2949 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,143 psi | 86% | 2933 fps | 97.6% |
| IMR 7828 SSC | <<locked>> | 98% | 55,158 psi | 86% | 3041 fps | 98.1% |
| Lovex S062 | <<locked>> | 82% | 56,681 psi | 89% | 2897 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,449 psi | 88% | 2927 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 54,563 psi | 86% | 2920 fps | 99.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 50,749 psi | 80% | 2871 fps | 99.7% |
| Norma 203B | <<locked>> | 82% | 57,377 psi | 90% | 2953 fps | 100% |
| Norma 204 | <<locked>> | 90% | 57,000 psi | 89% | 2999 fps | 99% |
| Norma MRP | <<locked>> | 96% | 56,927 psi | 89% | 3084 fps | 99.8% |
| Norma URP | <<locked>> | 90% | 57,435 psi | 90% | 2995 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,825 psi | 87% | 3061 fps | 98.5% |
| Ramshot Hunter | <<locked>> | 90% | 56,188 psi | 88% | 2999 fps | 100% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,824 psi | 84% | 2992 fps | 99.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,391 psi | 59% | 1890 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,245 psi | 87% | 2913 fps | 99.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,898 psi | 89% | 3018 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,071 psi | 86% | 2979 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,508 psi | 90% | 3068 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,429 psi | 77% | 3025 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 84% | 55,535 psi | 87% | 2907 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,450 psi | 90% | 2976 fps | 98.4% |
| Rottweil R 905 | <<locked>> | 94% | 54,955 psi | 86% | 2986 fps | 99% |
| Rottweil R 907 | <<locked>> | 86% | 54,505 psi | 85% | 2904 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,449 psi | 88% | 2927 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 56,681 psi | 89% | 2897 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,563 psi | 86% | 2920 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,421 psi | 90% | 2969 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,970 psi | 88% | 2785 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 55,941 psi | 88% | 2881 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,505 psi | 85% | 2979 fps | 98.9% |
| Somchem S355 | <<locked>> | 84% | 55,216 psi | 87% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,521 psi | 87% | 2913 fps | 97.4% |
| Somchem S365 | <<locked>> | 92% | 57,392 psi | 90% | 2992 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,390 psi | 87% | 2956 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 86% | 56,753 psi | 89% | 2874 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,796 psi | 87% | 2933 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,926 psi | 86% | 2933 fps | 99.2% |
| Vihtavuori N540 | <<locked>> | 82% | 57,406 psi | 90% | 2874 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,766 psi | 86% | 2936 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,594 psi | 89% | 3009 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 56,884 psi | 89% | 3077 fps | 98% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,359 psi | 82% | 2986 fps | 97.4% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,390 psi | 87% | 2897 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,217 psi | 90% | 3012 fps | 99.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,056 psi | 86% | 3114 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,463 psi | 87% | 2949 fps | 98.9% |
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 2700 | <<locked>> | 80% | 53,896 psi | 84% | 2854 fps | 99.2% |
| Accurate 3100 | <<locked>> | 82% | 32,663 psi | 51% | 2500 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 53,461 psi | 84% | 2831 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,524 psi | 65% | 2720 fps | 99.5% |
| Accurate MAGPRO | <<locked>> | 92% | 48,428 psi | 76% | 2930 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 50,357 psi | 79% | 2822 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 40,074 psi | 63% | 2703 fps | 95.4% |
| ADI AR 2213 | <<locked>> | 90% | 43,888 psi | 69% | 2815 fps | 95.2% |
| ADI AR 2225 | <<locked>> | 96% | 34,737 psi | 54% | 2648 fps | 95.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,126 psi | 80% | 2841 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,161 psi | 63% | 2730 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,354 psi | 73% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,914 psi | 63% | 2697 fps | 95.5% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,480 psi | 63% | 2753 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,501 psi | 46% | 2477 fps | 98.1% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,415 psi | 49% | 2549 fps | 95.8% |
| Alliant Reloder-26 | 60.6 gr | 80% | 31,821 psi | 50% | 2595 fps | 96.8% |
| Bofors RP15 | <<locked>> | 90% | 40,118 psi | 63% | 2743 fps | 95.5% |
| Bofors RP3 | <<locked>> | 80% | 51,634 psi | 81% | 2851 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 42,801 psi | 67% | 2831 fps | 95.8% |
| Bofors RP5 | <<locked>> | 88% | 40,480 psi | 63% | 2753 fps | 95.8% |
| Bofors RP7 | <<locked>> | 80% | 45,092 psi | 71% | 2733 fps | 97.9% |
| Hodgdon H1000 | <<locked>> | 96% | 43,076 psi | 68% | 2792 fps | 95.9% |
| Hodgdon H380 | <<locked>> | 80% | 51,822 psi | 81% | 2871 fps | 100% |
| Hodgdon H414 | <<locked>> | 80% | 43,613 psi | 68% | 2772 fps | 98.1% |
| Hodgdon H4350 | <<locked>> | 80% | 46,311 psi | 73% | 2789 fps | 97.6% |
| Hodgdon H4831 | <<locked>> | 90% | 46,992 psi | 74% | 2822 fps | 95.5% |
| Hodgdon H4831 SC | <<locked>> | 90% | 46,093 psi | 72% | 2805 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,797 psi | 59% | 2615 fps | 99.8% |
| Hodgdon Retumbo | <<locked>> | 92% | 37,405 psi | 59% | 2756 fps | 95.1% |
| Hodgdon Superformance | <<locked>> | 80% | 42,699 psi | 67% | 2785 fps | 97.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,398 psi | 43% | 1650 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,997 psi | 83% | 2854 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,625 psi | 64% | 2661 fps | 96.9% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,456 psi | 73% | 2762 fps | 98.6% |
| IMR 4831 | <<locked>> | 80% | 39,697 psi | 62% | 2667 fps | 99.3% |
| IMR 4955 Enduron | <<locked>> | 88% | 45,556 psi | 71% | 2759 fps | 95.3% |
| IMR 7828 SSC | <<locked>> | 92% | 44,976 psi | 70% | 2851 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 53,156 psi | 83% | 2844 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 43,932 psi | 69% | 2710 fps | 99.1% |
| Lovex S070 | <<locked>> | 80% | 42,163 psi | 66% | 2690 fps | 97.9% |
| Lovex S071 | <<locked>> | 86% | 31,879 psi | 50% | 2480 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 53,809 psi | 84% | 2900 fps | 100% |
| Norma 204 | <<locked>> | 80% | 40,451 psi | 63% | 2690 fps | 95.4% |
| Norma MRP | 60.3 gr | 82% | 34,330 psi | 54% | 2631 fps | 95% |
| Norma URP | <<locked>> | 80% | 41,176 psi | 65% | 2710 fps | 99.4% |
| Ramshot Grand | <<locked>> | 90% | 41,669 psi | 65% | 2792 fps | 95% |
| Ramshot Hunter | <<locked>> | 80% | 40,147 psi | 63% | 2703 fps | 98% |
| Ramshot Magnum | <<locked>> | 90% | 36,941 psi | 58% | 2661 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,992 psi | 44% | 1690 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,866 psi | 81% | 2858 fps | 99.6% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,284 psi | 77% | 2907 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,539 psi | 65% | 2740 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,089 psi | 63% | 2753 fps | 99% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,811 psi | 58% | 2736 fps | 96.2% |
| Rottweil R 903 | <<locked>> | 80% | 48,631 psi | 76% | 2799 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,411 psi | 70% | 2746 fps | 95.6% |
| Rottweil R 905 | <<locked>> | 84% | 39,131 psi | 61% | 2680 fps | 95.4% |
| Rottweil R 907 | <<locked>> | 80% | 45,092 psi | 71% | 2733 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,932 psi | 69% | 2710 fps | 99.1% |
| Shooters World Precision | <<locked>> | 80% | 53,156 psi | 83% | 2844 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,163 psi | 66% | 2690 fps | 97.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,241 psi | 79% | 2861 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,313 psi | 77% | 2690 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,888 psi | 67% | 2651 fps | 98% |
| SNPE Vectan Tubal 8000 | <<locked>> | 84% | 38,783 psi | 61% | 2674 fps | 95.3% |
| Somchem S355 | <<locked>> | 80% | 48,747 psi | 76% | 2799 fps | 100% |
| Somchem S361 | <<locked>> | 86% | 45,353 psi | 71% | 2733 fps | 95% |
| Somchem S365 | <<locked>> | 80% | 37,826 psi | 59% | 2664 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,130 psi | 58% | 2608 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 46,630 psi | 73% | 2723 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,569 psi | 67% | 2710 fps | 99.5% |
| Vihtavuori N165 | <<locked>> | 86% | 36,564 psi | 57% | 2585 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 53,679 psi | 84% | 2822 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 41,901 psi | 66% | 2710 fps | 99.3% |
| Vihtavuori N555 | <<locked>> | 80% | 32,924 psi | 52% | 2552 fps | 98.1% |
| Vihtavuori N560 | 66.2 gr | 90% | 46,050 psi | 72% | 2884 fps | 95.5% |
| Vihtavuori N565 | <<locked>> | 96% | 45,513 psi | 71% | 2858 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,698 psi | 65% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,613 psi | 68% | 2772 fps | 98.1% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,049 psi | 41% | 2461 fps | 97.5% |
| Winchester Supreme 780 | <<locked>> | 86% | 38,943 psi | 61% | 2644 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 82 powders for 7 mm Weath. Mag. loaded with the .284 | 150gr | Osprey Virtus. Winchester StaBALL HD delivers the highest muzzle velocity at 3,114 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,114 fps. ADI AR 2225 gives the best case fill at 100 %, and 82 of the 82 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 1:9.0 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. Alliant Reloder-26, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm Weath. Mag. with the .284 | 150gr | Osprey Virtus 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.