Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 140gr | NorthFork Bonded Core bullet and 78 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Norma MRP, Vihtavuori N560 and Alliant Reloder-26.
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% | 54,273 psi | 85% | 3015 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 55,753 psi | 87% | 3058 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 56,507 psi | 89% | 3163 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 84% | 57,406 psi | 90% | 3028 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 56,521 psi | 89% | 3107 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 54,201 psi | 85% | 3104 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 40,292 psi | 63% | 2867 fps | 97.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,955 psi | 86% | 2995 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,608 psi | 89% | 3120 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 54,027 psi | 85% | 3077 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 56,043 psi | 88% | 3097 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,682 psi | 90% | 3163 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,940 psi | 86% | 3084 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,691 psi | 79% | 3074 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 55,332 psi | 87% | 3173 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,536 psi | 89% | 3143 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 56,115 psi | 88% | 3015 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,644 psi | 73% | 2992 fps | 96.3% |
| Bofors RP5 | <<locked>> | 98% | 57,682 psi | 90% | 3163 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 55,158 psi | 86% | 3005 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,951 psi | 78% | 3015 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 56,086 psi | 88% | 3031 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,711 psi | 90% | 3114 fps | 99.7% |
| Hodgdon H4350 | <<locked>> | 86% | 56,753 psi | 89% | 3068 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 94% | 54,360 psi | 85% | 3045 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,898 psi | 89% | 3084 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,768 psi | 89% | 3038 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 49,647 psi | 78% | 3127 fps | 98.6% |
| Hodgdon Superformance | <<locked>> | 86% | 54,230 psi | 85% | 3087 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,796 psi | 58% | 1923 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,855 psi | 89% | 3009 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 56,449 psi | 88% | 3041 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,637 psi | 89% | 3031 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 56,246 psi | 88% | 3051 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,593 psi | 87% | 3031 fps | 97.2% |
| IMR 7828 SSC | <<locked>> | 98% | 55,782 psi | 87% | 3143 fps | 97.8% |
| Lovex S062 | <<locked>> | 82% | 57,188 psi | 90% | 3002 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 57,043 psi | 89% | 3028 fps | 100% |
| Lovex S070 | <<locked>> | 88% | 55,114 psi | 86% | 3022 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,576 psi | 81% | 2972 fps | 99.6% |
| Norma 204 | <<locked>> | 90% | 57,450 psi | 90% | 3097 fps | 98.7% |
| Norma MRP | <<locked>> | 96% | 57,580 psi | 90% | 3189 fps | 99.7% |
| Norma URP | <<locked>> | 88% | 54,288 psi | 85% | 3041 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 56,275 psi | 88% | 3163 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 56,695 psi | 89% | 3100 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 54,679 psi | 86% | 3094 fps | 99.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,594 psi | 59% | 1969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,796 psi | 87% | 3015 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 57,421 psi | 90% | 3127 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,796 psi | 87% | 3084 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 53,954 psi | 85% | 3107 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 50,183 psi | 79% | 3123 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 56,202 psi | 88% | 3012 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 54,476 psi | 85% | 3022 fps | 97.5% |
| Rottweil R 905 | <<locked>> | 94% | 55,492 psi | 87% | 3084 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 55,158 psi | 86% | 3005 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 57,043 psi | 89% | 3028 fps | 100% |
| Shooters World Precision | <<locked>> | 82% | 57,188 psi | 90% | 3002 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 55,114 psi | 86% | 3022 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 54,157 psi | 85% | 3015 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 56,333 psi | 88% | 2887 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,666 psi | 89% | 2982 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 55,042 psi | 86% | 3081 fps | 98.7% |
| Somchem S355 | <<locked>> | 84% | 55,869 psi | 88% | 3005 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 56,028 psi | 88% | 3009 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 54,215 psi | 85% | 3045 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 56,188 psi | 88% | 3058 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 86% | 57,363 psi | 90% | 2979 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 56,159 psi | 88% | 3035 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 55,434 psi | 87% | 3031 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 55,347 psi | 87% | 3038 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 57,319 psi | 90% | 3110 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,464 psi | 90% | 3176 fps | 97.6% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 53,243 psi | 83% | 3087 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,767 psi | 87% | 2992 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 54,230 psi | 85% | 3058 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 55,724 psi | 87% | 3222 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 56,188 psi | 88% | 3051 fps | 98.7% |
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>> | 82% | 33,649 psi | 53% | 2598 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 42,482 psi | 67% | 2822 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 92% | 49,037 psi | 77% | 3028 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 50,618 psi | 79% | 2917 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 43,381 psi | 68% | 2861 fps | 95.9% |
| ADI AR 2213 | <<locked>> | 92% | 47,442 psi | 74% | 2972 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 37,724 psi | 59% | 2799 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,663 psi | 81% | 2943 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,669 psi | 64% | 2825 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,760 psi | 73% | 2956 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 40,553 psi | 64% | 2792 fps | 95% |
| Alliant Reloder-22 | <<locked>> | 88% | 41,162 psi | 65% | 2848 fps | 95.4% |
| Alliant Reloder-23 | <<locked>> | 80% | 30,211 psi | 47% | 2569 fps | 97.8% |
| Alliant Reloder-25 | <<locked>> | 86% | 32,111 psi | 50% | 2638 fps | 95.4% |
| Alliant Reloder-26 | 63.1 gr | 80% | 32,750 psi | 51% | 2697 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 40,799 psi | 64% | 2835 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 52,475 psi | 82% | 2959 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,482 psi | 68% | 2927 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 41,162 psi | 65% | 2848 fps | 95.4% |
| Bofors RP7 | <<locked>> | 80% | 45,701 psi | 72% | 2831 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 43,685 psi | 68% | 2884 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 52,489 psi | 82% | 2972 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 44,193 psi | 69% | 2867 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 46,876 psi | 73% | 2890 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 90% | 47,384 psi | 74% | 2913 fps | 95% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,821 psi | 78% | 2963 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 38,290 psi | 60% | 2710 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,756 psi | 64% | 2920 fps | 95.8% |
| Hodgdon Superformance | <<locked>> | 80% | 43,308 psi | 68% | 2881 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,586 psi | 43% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 53,243 psi | 83% | 2953 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 41,089 psi | 64% | 2749 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 47,108 psi | 74% | 2861 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 40,538 psi | 64% | 2766 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 49,052 psi | 77% | 2913 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 45,368 psi | 71% | 2943 fps | 95.1% |
| Lovex S062 | <<locked>> | 80% | 53,809 psi | 84% | 2949 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,614 psi | 70% | 2808 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 42,844 psi | 67% | 2789 fps | 97.6% |
| Lovex S071 | <<locked>> | 86% | 32,851 psi | 51% | 2579 fps | 95.2% |
| Norma 204 | <<locked>> | 82% | 43,874 psi | 69% | 2844 fps | 95.9% |
| Norma MRP | 64.3 gr | 84% | 37,724 psi | 59% | 2795 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 41,742 psi | 65% | 2808 fps | 99.1% |
| Ramshot Grand | <<locked>> | 92% | 45,411 psi | 71% | 2956 fps | 95.6% |
| Ramshot Hunter | <<locked>> | 80% | 40,683 psi | 64% | 2799 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 40,553 psi | 64% | 2822 fps | 96.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 52,315 psi | 82% | 2956 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,647 psi | 78% | 3009 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 42,322 psi | 66% | 2838 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,669 psi | 64% | 2848 fps | 98.7% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,623 psi | 59% | 2828 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 49,342 psi | 77% | 2904 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 44,976 psi | 70% | 2841 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 39,726 psi | 62% | 2776 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 45,701 psi | 72% | 2831 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,614 psi | 70% | 2808 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 53,809 psi | 84% | 2949 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,844 psi | 67% | 2789 fps | 97.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,749 psi | 80% | 2959 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,951 psi | 78% | 2792 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,671 psi | 68% | 2749 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 42,206 psi | 66% | 2831 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 49,414 psi | 77% | 2900 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 49,110 psi | 77% | 2887 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 38,435 psi | 60% | 2762 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,826 psi | 59% | 2700 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 47,210 psi | 74% | 2822 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 43,294 psi | 68% | 2808 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 39,827 psi | 62% | 2740 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 42,583 psi | 67% | 2808 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 33,765 psi | 53% | 2651 fps | 97.8% |
| Vihtavuori N560 | 68.9 gr | 90% | 46,847 psi | 73% | 2982 fps | 95.1% |
| Vihtavuori N565 | <<locked>> | 96% | 46,441 psi | 73% | 2959 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 42,221 psi | 66% | 2769 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 44,193 psi | 69% | 2867 fps | 97.8% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,818 psi | 42% | 2552 fps | 97.1% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,525 psi | 67% | 2802 fps | 95.7% |
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 84 powders for 7 mm Weath. Mag. loaded with the .284 | 140gr | NorthFork Bonded Core. Winchester StaBALL HD delivers the highest muzzle velocity at 3,222 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,222 fps. ADI AR 2217 gives the best case fill at 100 %, and 84 of the 84 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 56–90 %, leaving at least 10 % headroom. The 140.0 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for 7 mm Weath. Mag. with the .284 | 140gr | NorthFork Bonded Core they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, IMR 8133 Enduron, Norma 217 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.