Load Specifications
Load data in caliber 7 mm Weath. Mag. with .284 | 140gr | Sierra GameKing bullet and 83 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Accurate High Country 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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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% | 57,653 psi | 90% | 3009 fps | 99.3% |
| Accurate 3100 | <<locked>> | 98% | 57,435 psi | 90% | 3064 fps | 99.9% |
| Accurate 4064 | <<locked>> | 82% | 57,508 psi | 90% | 2986 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 55,158 psi | 86% | 3051 fps | 100% |
| Accurate High Country | <<locked>> | 94% | 54,998 psi | 86% | 3153 fps | 97.7% |
| Accurate MAGPRO | <<locked>> | 96% | 55,767 psi | 87% | 3150 fps | 96.6% |
| ADI AR 2208 | <<locked>> | 84% | 56,782 psi | 89% | 3018 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 55,970 psi | 88% | 3100 fps | 98.6% |
| ADI AR 2213 | <<locked>> | 98% | 57,624 psi | 90% | 3159 fps | 97.9% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 39,769 psi | 62% | 2854 fps | 96.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 54,578 psi | 86% | 2992 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 56,014 psi | 88% | 3110 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 86% | 57,261 psi | 90% | 3130 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 55,564 psi | 87% | 3087 fps | 98.6% |
| Alliant Reloder-22 | <<locked>> | 98% | 57,203 psi | 90% | 3156 fps | 99% |
| Alliant Reloder-23 | <<locked>> | 98% | 54,418 psi | 85% | 3077 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 50,256 psi | 79% | 3068 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 54,520 psi | 85% | 3163 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 56,072 psi | 88% | 3133 fps | 98.7% |
| Bofors RP3 | <<locked>> | 82% | 55,477 psi | 87% | 3005 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 46,151 psi | 72% | 2982 fps | 96.1% |
| Bofors RP5 | <<locked>> | 98% | 57,203 psi | 90% | 3156 fps | 99% |
| Bofors RP7 | <<locked>> | 86% | 54,592 psi | 86% | 2995 fps | 99.1% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 49,559 psi | 78% | 3005 fps | 97.1% |
| Hodgdon H380 | <<locked>> | 82% | 55,738 psi | 87% | 3028 fps | 100% |
| Hodgdon H414 | <<locked>> | 88% | 57,145 psi | 90% | 3107 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 86% | 56,492 psi | 89% | 3061 fps | 98.9% |
| Hodgdon H4831 | <<locked>> | 96% | 57,740 psi | 90% | 3100 fps | 97.3% |
| Hodgdon H4831 SC | <<locked>> | 96% | 56,405 psi | 88% | 3077 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 56,434 psi | 88% | 3031 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 48,979 psi | 77% | 3114 fps | 98.4% |
| Hodgdon Superformance | <<locked>> | 86% | 53,708 psi | 84% | 3081 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,811 psi | 58% | 1923 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 56,246 psi | 88% | 2999 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 55,941 psi | 88% | 3031 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 86% | 56,072 psi | 88% | 3022 fps | 99.5% |
| IMR 4831 | <<locked>> | 90% | 55,666 psi | 87% | 3041 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 55,114 psi | 86% | 3022 fps | 97% |
| IMR 7828 SSC | <<locked>> | 98% | 55,056 psi | 86% | 3130 fps | 97.6% |
| Lovex S062 | <<locked>> | 82% | 56,811 psi | 89% | 2995 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 56,521 psi | 89% | 3018 fps | 99.9% |
| Lovex S070 | <<locked>> | 88% | 54,578 psi | 86% | 3012 fps | 99.5% |
| Lovex S071ᴾ | <<locked>> | 100% | 51,039 psi | 80% | 2963 fps | 99.5% |
| Norma 203B | <<locked>> | 82% | 57,595 psi | 90% | 3054 fps | 100% |
| Norma 204 | <<locked>> | 90% | 56,956 psi | 89% | 3087 fps | 98.6% |
| Norma MRP | <<locked>> | 96% | 57,014 psi | 89% | 3182 fps | 99.7% |
| Norma URP | <<locked>> | 90% | 57,406 psi | 90% | 3091 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 55,811 psi | 87% | 3153 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 56,188 psi | 88% | 3091 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 53,983 psi | 85% | 3084 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,608 psi | 59% | 1969 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 55,477 psi | 87% | 3012 fps | 99.7% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 56,724 psi | 89% | 3117 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 55,245 psi | 87% | 3074 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 57,522 psi | 90% | 3163 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 49,574 psi | 78% | 3110 fps | 99.3% |
| Rottweil R 903 | <<locked>> | 84% | 55,825 psi | 87% | 3009 fps | 100% |
| Rottweil R 904 | <<locked>> | 94% | 57,450 psi | 90% | 3068 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 94% | 54,984 psi | 86% | 3077 fps | 98.6% |
| Rottweil R 907 | <<locked>> | 86% | 54,592 psi | 86% | 2995 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 88% | 56,521 psi | 89% | 3018 fps | 99.9% |
| Shooters World Precision | <<locked>> | 82% | 56,811 psi | 89% | 2995 fps | 100% |
| Shooters World SW4350 | <<locked>> | 88% | 54,578 psi | 86% | 3012 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 57,232 psi | 90% | 3064 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,956 psi | 88% | 2881 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 56,130 psi | 88% | 2972 fps | 99.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 54,520 psi | 85% | 3071 fps | 98.5% |
| Somchem S355 | <<locked>> | 84% | 55,521 psi | 87% | 2999 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 55,622 psi | 87% | 3002 fps | 96.9% |
| Somchem S365 | <<locked>> | 92% | 57,479 psi | 90% | 3091 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 55,448 psi | 87% | 3045 fps | 99.2% |
| Vihtavuori N150 | <<locked>> | 86% | 56,768 psi | 89% | 2972 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 55,593 psi | 87% | 3025 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 54,984 psi | 86% | 3022 fps | 98.9% |
| Vihtavuori N540 | <<locked>> | 82% | 57,508 psi | 90% | 2969 fps | 100% |
| Vihtavuori N550 | <<locked>> | 88% | 54,810 psi | 86% | 3031 fps | 100% |
| Vihtavuori N555 | <<locked>> | 96% | 56,768 psi | 89% | 3107 fps | 100% |
| Vihtavuori N560 | <<locked>> | 96% | 57,000 psi | 89% | 3173 fps | 97.5% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 52,547 psi | 82% | 3074 fps | 96.8% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 55,317 psi | 87% | 2986 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 57,363 psi | 90% | 3110 fps | 99.7% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 54,824 psi | 86% | 3209 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 55,463 psi | 87% | 3038 fps | 98.5% |
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% | 53,766 psi | 84% | 2943 fps | 98.8% |
| Accurate 3100 | <<locked>> | 82% | 33,315 psi | 52% | 2589 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 54,041 psi | 85% | 2936 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 41,916 psi | 66% | 2808 fps | 99.2% |
| Accurate High Country | 66.7 gr | 88% | 44,440 psi | 70% | 2949 fps | 95.1% |
| Accurate MAGPRO | <<locked>> | 94% | 52,069 psi | 82% | 3084 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 50,241 psi | 79% | 2910 fps | 100% |
| ADI AR 2209 | <<locked>> | 86% | 42,917 psi | 67% | 2851 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 92% | 47,021 psi | 74% | 2963 fps | 95.5% |
| ADI AR 2225 | <<locked>> | 98% | 37,362 psi | 59% | 2789 fps | 95.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 51,300 psi | 80% | 2936 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 40,321 psi | 63% | 2818 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 46,383 psi | 73% | 2949 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 86% | 42,888 psi | 67% | 2844 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 88% | 40,654 psi | 64% | 2838 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,936 psi | 47% | 2562 fps | 97.7% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,734 psi | 50% | 2628 fps | 95.1% |
| Alliant Reloder-26 | 62.5 gr | 80% | 32,300 psi | 51% | 2684 fps | 96.3% |
| Bofors RP15 | <<locked>> | 92% | 42,989 psi | 67% | 2887 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 52,098 psi | 82% | 2953 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 43,033 psi | 67% | 2917 fps | 95.1% |
| Bofors RP5 | <<locked>> | 88% | 40,654 psi | 64% | 2838 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 45,165 psi | 71% | 2818 fps | 97.4% |
| Hodgdon H1000 | <<locked>> | 96% | 43,105 psi | 68% | 2871 fps | 95.1% |
| Hodgdon H380 | <<locked>> | 80% | 52,127 psi | 82% | 2966 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 43,656 psi | 68% | 2858 fps | 97.6% |
| Hodgdon H4350 | <<locked>> | 80% | 46,528 psi | 73% | 2884 fps | 97.1% |
| Hodgdon H4831 | <<locked>> | 92% | 50,256 psi | 79% | 2972 fps | 95.7% |
| Hodgdon H4831 SC | <<locked>> | 92% | 49,356 psi | 77% | 2953 fps | 95.5% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,913 psi | 59% | 2700 fps | 99.6% |
| Hodgdon Retumbo | <<locked>> | 94% | 40,321 psi | 63% | 2907 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 42,786 psi | 67% | 2871 fps | 97.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,528 psi | 43% | 1719 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 52,866 psi | 83% | 2946 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,799 psi | 64% | 2743 fps | 96.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 46,586 psi | 73% | 2851 fps | 98.2% |
| IMR 4831 | <<locked>> | 80% | 40,016 psi | 63% | 2756 fps | 99% |
| IMR 4955 Enduron | <<locked>> | 90% | 48,602 psi | 76% | 2904 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 94% | 48,138 psi | 75% | 2999 fps | 95.9% |
| Lovex S062 | <<locked>> | 80% | 53,200 psi | 83% | 2940 fps | 100% |
| Lovex S065 | <<locked>> | 80% | 44,266 psi | 69% | 2802 fps | 98.8% |
| Lovex S070 | <<locked>> | 80% | 42,511 psi | 67% | 2782 fps | 97.5% |
| Lovex S071 | <<locked>> | 86% | 32,547 psi | 51% | 2569 fps | 95% |
| Norma 203B | <<locked>> | 80% | 53,925 psi | 85% | 2995 fps | 100% |
| Norma 204 | <<locked>> | 82% | 43,381 psi | 68% | 2835 fps | 95.7% |
| Norma MRP | 63.7 gr | 84% | 37,275 psi | 58% | 2785 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 41,408 psi | 65% | 2802 fps | 99.1% |
| Ramshot Grand | <<locked>> | 92% | 44,933 psi | 70% | 2946 fps | 95.4% |
| Ramshot Hunter | <<locked>> | 80% | 40,190 psi | 63% | 2785 fps | 97.5% |
| Ramshot Magnum | <<locked>> | 92% | 39,929 psi | 63% | 2808 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,137 psi | 44% | 1759 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,996 psi | 81% | 2953 fps | 99.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 49,226 psi | 77% | 3002 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 41,800 psi | 66% | 2828 fps | 99% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 40,205 psi | 63% | 2838 fps | 98.6% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 37,130 psi | 58% | 2818 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 48,979 psi | 77% | 2897 fps | 100% |
| Rottweil R 904 | <<locked>> | 88% | 47,398 psi | 74% | 2890 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 86% | 42,047 psi | 66% | 2828 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 45,165 psi | 71% | 2818 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 80% | 44,266 psi | 69% | 2802 fps | 98.8% |
| Shooters World Precision | <<locked>> | 80% | 53,200 psi | 83% | 2940 fps | 100% |
| Shooters World SW4350 | <<locked>> | 80% | 42,511 psi | 67% | 2782 fps | 97.5% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 50,140 psi | 79% | 2949 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 49,588 psi | 78% | 2789 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 43,178 psi | 68% | 2740 fps | 97.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 41,684 psi | 65% | 2822 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 49,052 psi | 77% | 2894 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 48,660 psi | 76% | 2881 fps | 95.3% |
| Somchem S365 | <<locked>> | 80% | 38,072 psi | 60% | 2756 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 37,362 psi | 59% | 2690 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 46,833 psi | 73% | 2815 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 42,757 psi | 67% | 2799 fps | 99.3% |
| Vihtavuori N165 | <<locked>> | 88% | 39,407 psi | 62% | 2726 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 53,954 psi | 85% | 2920 fps | 100% |
| Vihtavuori N550 | <<locked>> | 80% | 42,279 psi | 66% | 2802 fps | 99.1% |
| Vihtavuori N555 | <<locked>> | 80% | 33,402 psi | 52% | 2644 fps | 97.7% |
| Vihtavuori N560 | <<locked>> | 92% | 49,429 psi | 77% | 3035 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 96% | 45,745 psi | 72% | 2943 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 41,771 psi | 65% | 2762 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,830 psi | 69% | 2861 fps | 97.7% |
| Winchester StaBALL HD | <<locked>> | 80% | 26,455 psi | 41% | 2539 fps | 96.9% |
| Winchester Supreme 780 | <<locked>> | 88% | 42,061 psi | 66% | 2792 fps | 95.5% |
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 88 powders for 7 mm Weath. Mag. loaded with the .284 | 140gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,209 fps; across all powders the maximum-charge window runs from 1,923 fps to 3,209 fps. ADI AR 2217 gives the best case fill at 100 %, and 88 of the 88 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (440 MPa), the top charges use 55–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:10.0 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. Alliant Reloder-26, Accurate High Country, Norma MRP rank at the top here: for 7 mm Weath. Mag. with the .284 | 140gr | Sierra GameKing they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, Baschieri & Pellagri 109, Norma 217, ReloadSwiss RS 80 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.