Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 160gr | Barnes MRX BT 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, 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.
A valid access license is required to use the Personalized Load Calculator.
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 3100 | <<locked>> | 94% | 55,405 psi | 87% | 2867 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 56,695 psi | 89% | 2897 fps | 100% |
| Accurate High Country | <<locked>> | 92% | 57,348 psi | 90% | 3022 fps | 99.2% |
| Accurate MAGPRO | <<locked>> | 92% | 54,273 psi | 85% | 2963 fps | 97.8% |
| ADI AR 2208 | <<locked>> | 82% | 57,696 psi | 90% | 2858 fps | 100% |
| ADI AR 2209 | <<locked>> | 90% | 54,157 psi | 85% | 2904 fps | 99.3% |
| ADI AR 2213 | <<locked>> | 94% | 55,477 psi | 87% | 2966 fps | 98.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 49,748 psi | 78% | 2861 fps | 98.2% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 44,295 psi | 69% | 2818 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 54,375 psi | 85% | 2904 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 55,187 psi | 86% | 2913 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 57,232 psi | 90% | 2949 fps | 99.6% |
| Alliant Reloder-22 | <<locked>> | 94% | 55,448 psi | 87% | 2959 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 96% | 56,710 psi | 89% | 2927 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 56,217 psi | 88% | 2992 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 57,450 psi | 90% | 3022 fps | 100% |
| Baschieri & Pellagri 109 | <<locked>> | 96% | 57,276 psi | 90% | 2927 fps | 96.7% |
| Bofors RP15 | <<locked>> | 96% | 54,607 psi | 86% | 2943 fps | 99.4% |
| Bofors RP30ᴾ | <<locked>> | 100% | 52,054 psi | 82% | 2933 fps | 98.8% |
| Bofors RP5 | <<locked>> | 94% | 55,448 psi | 87% | 2959 fps | 99.6% |
| Bofors RP7 | <<locked>> | 84% | 55,448 psi | 87% | 2848 fps | 99.8% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 54,955 psi | 86% | 2953 fps | 99.4% |
| Hodgdon H414 | <<locked>> | 84% | 54,984 psi | 86% | 2900 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 84% | 57,522 psi | 90% | 2913 fps | 99.7% |
| Hodgdon H4831 | <<locked>> | 92% | 55,477 psi | 87% | 2904 fps | 98.3% |
| Hodgdon H4831 SC | <<locked>> | 92% | 54,447 psi | 85% | 2887 fps | 98.1% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 54,520 psi | 85% | 2828 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 55,071 psi | 86% | 3064 fps | 100% |
| Hodgdon Superformance | <<locked>> | 84% | 55,448 psi | 87% | 2940 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 37,115 psi | 58% | 1814 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 57,174 psi | 90% | 2887 fps | 99.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 57,043 psi | 89% | 2871 fps | 100% |
| IMR 4831 | <<locked>> | 88% | 57,232 psi | 90% | 2894 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 56,550 psi | 89% | 2890 fps | 98.6% |
| IMR 7828 SSC | <<locked>> | 96% | 57,406 psi | 90% | 3005 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 57,450 psi | 90% | 2864 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 55,666 psi | 87% | 2864 fps | 100% |
| Lovex S071ᴾ | <<locked>> | 100% | 56,434 psi | 88% | 2881 fps | 100% |
| Norma 204 | <<locked>> | 86% | 54,694 psi | 86% | 2890 fps | 99.3% |
| Norma 217ᴾ | <<locked>> | 100% | 39,827 psi | 62% | 2740 fps | 98% |
| Norma MRP | <<locked>> | 92% | 55,521 psi | 87% | 2982 fps | 100% |
| Norma URP | <<locked>> | 86% | 55,187 psi | 86% | 2881 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 54,085 psi | 85% | 2963 fps | 99% |
| Ramshot Hunter | <<locked>> | 86% | 54,215 psi | 85% | 2890 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 56,478 psi | 89% | 2956 fps | 99.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,768 psi | 59% | 1854 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 56,826 psi | 89% | 2923 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 55,347 psi | 87% | 2953 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 55,941 psi | 88% | 3064 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 50,546 psi | 79% | 2940 fps | 97.3% |
| Rottweil R 903 | <<locked>> | 82% | 56,695 psi | 89% | 2841 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 55,230 psi | 87% | 2874 fps | 98.8% |
| Rottweil R 905 | <<locked>> | 92% | 56,739 psi | 89% | 2936 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 84% | 55,448 psi | 87% | 2848 fps | 99.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 57,450 psi | 90% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 55,666 psi | 87% | 2864 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 56,608 psi | 89% | 2717 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 56,942 psi | 89% | 2825 fps | 100% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 56,304 psi | 88% | 2933 fps | 99.6% |
| Somchem S355 | <<locked>> | 82% | 56,478 psi | 89% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 56,884 psi | 89% | 2871 fps | 98.5% |
| Somchem S365 | <<locked>> | 88% | 55,709 psi | 87% | 2884 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 57,246 psi | 90% | 2910 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 82% | 54,056 psi | 85% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 57,043 psi | 89% | 2874 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 56,898 psi | 89% | 2890 fps | 99.8% |
| Vihtavuori N550 | <<locked>> | 86% | 56,188 psi | 88% | 2881 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 55,201 psi | 87% | 2904 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 55,332 psi | 87% | 2979 fps | 98.5% |
| Vihtavuori N565 | <<locked>> | 98% | 55,027 psi | 86% | 2956 fps | 98.6% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 51,822 psi | 81% | 2949 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 56,637 psi | 89% | 2835 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 54,984 psi | 86% | 2900 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 54,882 psi | 86% | 3012 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 57,348 psi | 90% | 2910 fps | 99.6% |
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% | 34,113 psi | 53% | 2470 fps | 97.3% |
| Accurate 4350 | <<locked>> | 80% | 46,079 psi | 72% | 2730 fps | 100% |
| Accurate High Country | <<locked>> | 82% | 40,103 psi | 63% | 2697 fps | 95.4% |
| Accurate MAGPRO | <<locked>> | 86% | 43,714 psi | 69% | 2766 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 54,288 psi | 85% | 2808 fps | 100% |
| ADI AR 2209 | <<locked>> | 80% | 38,566 psi | 60% | 2605 fps | 96% |
| ADI AR 2213 | <<locked>> | 86% | 42,163 psi | 66% | 2717 fps | 95.9% |
| ADI AR 2217 | <<locked>> | 94% | 40,466 psi | 63% | 2674 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 90% | 31,720 psi | 50% | 2503 fps | 95.1% |
| Alliant Reloder-16 | <<locked>> | 80% | 44,469 psi | 70% | 2740 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 51,459 psi | 81% | 2858 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 38,537 psi | 60% | 2598 fps | 96.1% |
| Alliant Reloder-22 | <<locked>> | 82% | 36,724 psi | 58% | 2592 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 32,924 psi | 52% | 2500 fps | 99.6% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,616 psi | 45% | 2405 fps | 95.5% |
| Alliant Reloder-26 | <<locked>> | 80% | 36,158 psi | 57% | 2635 fps | 99.1% |
| Baschieri & Pellagri 109 | <<locked>> | 92% | 50,546 psi | 79% | 2812 fps | 95.1% |
| Bofors RP15 | <<locked>> | 84% | 36,593 psi | 57% | 2589 fps | 95.3% |
| Bofors RP30 | <<locked>> | 92% | 39,334 psi | 62% | 2684 fps | 95.7% |
| Bofors RP5 | <<locked>> | 82% | 36,724 psi | 58% | 2592 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 48,805 psi | 76% | 2736 fps | 99.2% |
| Hodgdon H1000 | <<locked>> | 90% | 38,769 psi | 61% | 2638 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 80% | 47,848 psi | 75% | 2782 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 80% | 50,430 psi | 79% | 2799 fps | 99.1% |
| Hodgdon H4831 | <<locked>> | 84% | 42,047 psi | 66% | 2661 fps | 95.1% |
| Hodgdon H4831 SC | <<locked>> | 86% | 44,266 psi | 69% | 2707 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 41,800 psi | 66% | 2621 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 36,506 psi | 57% | 2671 fps | 96.1% |
| Hodgdon Superformance | <<locked>> | 80% | 47,674 psi | 75% | 2808 fps | 99.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,688 psi | 43% | 1617 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 44,367 psi | 70% | 2671 fps | 98.6% |
| IMR 4451 Enduron | <<locked>> | 80% | 50,299 psi | 79% | 2762 fps | 99.6% |
| IMR 4831 | <<locked>> | 80% | 43,830 psi | 69% | 2674 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 82% | 40,915 psi | 64% | 2602 fps | 95% |
| IMR 7828 SSC | <<locked>> | 86% | 40,538 psi | 64% | 2690 fps | 95.4% |
| Lovex S065 | <<locked>> | 80% | 47,659 psi | 75% | 2710 fps | 99.9% |
| Lovex S070 | <<locked>> | 80% | 46,079 psi | 72% | 2700 fps | 99.3% |
| Lovex S071 | <<locked>> | 80% | 29,254 psi | 46% | 2343 fps | 95.3% |
| Norma 204 | <<locked>> | 80% | 44,353 psi | 70% | 2707 fps | 97.6% |
| Norma 217 | <<locked>> | 96% | 34,664 psi | 54% | 2612 fps | 96.1% |
| Norma MRP | 61.4 gr | 80% | 35,955 psi | 56% | 2602 fps | 96.8% |
| Norma URP | <<locked>> | 80% | 45,397 psi | 71% | 2720 fps | 100% |
| Ramshot Grand | <<locked>> | 86% | 40,205 psi | 63% | 2697 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 80% | 44,179 psi | 69% | 2713 fps | 99.4% |
| Ramshot Magnum | <<locked>> | 84% | 33,272 psi | 52% | 2507 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,326 psi | 44% | 1657 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 46,137 psi | 72% | 2753 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 44,396 psi | 70% | 2769 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 33,228 psi | 52% | 2575 fps | 95.8% |
| ReloadSwiss RS 80 | <<locked>> | 96% | 43,265 psi | 68% | 2799 fps | 95.2% |
| Rottweil R 903 | <<locked>> | 80% | 53,214 psi | 83% | 2792 fps | 100% |
| Rottweil R 904 | <<locked>> | 80% | 39,929 psi | 63% | 2589 fps | 95.3% |
| Rottweil R 905 | <<locked>> | 80% | 37,884 psi | 59% | 2582 fps | 96.1% |
| Rottweil R 907 | <<locked>> | 80% | 48,805 psi | 76% | 2736 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 47,659 psi | 75% | 2710 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 80% | 46,079 psi | 72% | 2700 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 53,200 psi | 83% | 2671 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 46,586 psi | 73% | 2657 fps | 99.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 37,550 psi | 59% | 2579 fps | 95.9% |
| Somchem S355 | <<locked>> | 80% | 52,866 psi | 83% | 2785 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 43,366 psi | 68% | 2631 fps | 95.6% |
| Somchem S365 | <<locked>> | 80% | 42,380 psi | 66% | 2674 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 38,218 psi | 60% | 2566 fps | 97% |
| Vihtavuori N150 | <<locked>> | 80% | 50,792 psi | 80% | 2713 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 46,775 psi | 73% | 2713 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 35,549 psi | 56% | 2497 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 80% | 46,108 psi | 72% | 2717 fps | 100% |
| Vihtavuori N555 | <<locked>> | 80% | 37,028 psi | 58% | 2575 fps | 99.6% |
| Vihtavuori N560 | 64.4 gr | 84% | 41,626 psi | 65% | 2720 fps | 95.2% |
| Vihtavuori N565 | <<locked>> | 90% | 41,727 psi | 65% | 2707 fps | 95.5% |
| Vihtavuori N568 | <<locked>> | 96% | 44,715 psi | 70% | 2815 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 45,992 psi | 72% | 2677 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 48,095 psi | 75% | 2785 fps | 99.5% |
| Winchester StaBALL HD | 60.7 gr | 80% | 29,124 psi | 46% | 2510 fps | 99.7% |
| Winchester Supreme 780 | <<locked>> | 82% | 37,478 psi | 59% | 2546 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 80 powders for 7 mm Weath. Mag. loaded with the .284 | 160gr | Barnes MRX BT. Hodgdon Retumbo delivers the highest muzzle velocity at 3,064 fps; across all powders the maximum-charge window runs from 1,814 fps to 3,064 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 160.0 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, Vihtavuori N560, Norma MRP rank at the top here: for 7 mm Weath. Mag. with the .284 | 160gr | Barnes MRX BT 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.