Load Specifications
Load data in caliber 7 mm Blaser Mag. with .284 | 140gr | Sierra GameKing bullet and 75 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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 96% | 52,344 psi | 86% | 3028 fps | 99.8% |
| Accurate 4350 | <<locked>> | 88% | 53,983 psi | 89% | 3077 fps | 100% |
| Accurate MAGPRO | <<locked>> | 96% | 54,433 psi | 89% | 3176 fps | 96.8% |
| ADI AR 2208 | <<locked>> | 82% | 52,576 psi | 86% | 2989 fps | 100% |
| ADI AR 2209 | <<locked>> | 94% | 54,781 psi | 90% | 3123 fps | 98.7% |
| ADI AR 2213 | <<locked>> | 96% | 52,707 psi | 87% | 3120 fps | 97.4% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 38,827 psi | 64% | 2881 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 53,635 psi | 88% | 3015 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 54,839 psi | 90% | 3136 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 84% | 52,272 psi | 86% | 3097 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 94% | 54,433 psi | 89% | 3114 fps | 98.7% |
| Alliant Reloder-22 | <<locked>> | 96% | 52,228 psi | 86% | 3117 fps | 98.5% |
| Alliant Reloder-23 | <<locked>> | 98% | 52,866 psi | 87% | 3097 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 48,994 psi | 80% | 3094 fps | 99.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 52,968 psi | 87% | 3186 fps | 100% |
| Bofors RP15ᴾ | <<locked>> | 100% | 54,650 psi | 90% | 3159 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 54,549 psi | 90% | 3035 fps | 100% |
| Bofors RP30ᴾ | <<locked>> | 100% | 44,889 psi | 74% | 3009 fps | 96.3% |
| Bofors RP5 | <<locked>> | 96% | 52,228 psi | 86% | 3117 fps | 98.5% |
| Bofors RP7 | <<locked>> | 86% | 53,824 psi | 88% | 3022 fps | 99.2% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 48,443 psi | 80% | 3028 fps | 97.3% |
| Hodgdon H380 | <<locked>> | 82% | 54,665 psi | 90% | 3051 fps | 100% |
| Hodgdon H414 | <<locked>> | 86% | 52,402 psi | 86% | 3071 fps | 99.4% |
| Hodgdon H4350 | <<locked>> | 84% | 51,895 psi | 85% | 3025 fps | 98.5% |
| Hodgdon H4831 | <<locked>> | 94% | 52,518 psi | 86% | 3054 fps | 96.7% |
| Hodgdon H4831 SC | <<locked>> | 94% | 51,561 psi | 85% | 3038 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 55,085 psi | 90% | 3051 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 47,776 psi | 78% | 3136 fps | 98.5% |
| Hodgdon Superformance | <<locked>> | 86% | 52,301 psi | 86% | 3100 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,666 psi | 60% | 1932 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 54,998 psi | 90% | 3058 fps | 99.3% |
| IMR 4451 Enduron | <<locked>> | 84% | 51,837 psi | 85% | 2989 fps | 99.2% |
| IMR 4831 | <<locked>> | 90% | 54,404 psi | 89% | 3064 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 94% | 54,085 psi | 89% | 3045 fps | 97.1% |
| IMR 7828 SSC | <<locked>> | 98% | 53,708 psi | 88% | 3153 fps | 97.7% |
| Lovex S065 | <<locked>> | 86% | 52,431 psi | 86% | 2992 fps | 99.8% |
| Lovex S070 | <<locked>> | 88% | 53,606 psi | 88% | 3038 fps | 99.6% |
| Lovex S071ᴾ | <<locked>> | 100% | 49,879 psi | 82% | 2989 fps | 99.6% |
| Norma 204 | <<locked>> | 88% | 52,315 psi | 86% | 3054 fps | 98.2% |
| Norma MRP | <<locked>> | 94% | 51,663 psi | 85% | 3140 fps | 99.4% |
| Norma URP | <<locked>> | 88% | 52,634 psi | 86% | 3058 fps | 100% |
| Ramshot Grand | <<locked>> | 98% | 54,433 psi | 89% | 3173 fps | 98.2% |
| Ramshot Hunter | <<locked>> | 90% | 54,984 psi | 90% | 3117 fps | 99.9% |
| Ramshot Magnumᴾ | <<locked>> | 100% | 52,489 psi | 86% | 3104 fps | 99.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,478 psi | 62% | 1982 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 54,491 psi | 89% | 3035 fps | 99.8% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 51,634 psi | 85% | 3087 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 53,940 psi | 89% | 3097 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 52,228 psi | 86% | 3123 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 48,225 psi | 79% | 3136 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 84% | 54,665 psi | 90% | 3028 fps | 100% |
| Rottweil R 904 | <<locked>> | 92% | 52,808 psi | 87% | 3031 fps | 97.4% |
| Rottweil R 905 | <<locked>> | 94% | 53,766 psi | 88% | 3100 fps | 98.7% |
| Rottweil R 907 | <<locked>> | 86% | 53,824 psi | 88% | 3022 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 86% | 52,431 psi | 86% | 2992 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 88% | 53,606 psi | 88% | 3038 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 52,518 psi | 86% | 3031 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 55,100 psi | 90% | 2904 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 54,998 psi | 90% | 2995 fps | 99.6% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 53,316 psi | 88% | 3094 fps | 98.6% |
| Somchem S355 | <<locked>> | 84% | 54,607 psi | 90% | 3025 fps | 100% |
| Somchem S361 | <<locked>> | 92% | 54,404 psi | 89% | 3022 fps | 97% |
| Somchem S365 | <<locked>> | 90% | 52,460 psi | 86% | 3061 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 54,317 psi | 89% | 3071 fps | 99.3% |
| Vihtavuori N150 | <<locked>> | 84% | 52,286 psi | 86% | 2943 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 54,549 psi | 90% | 3051 fps | 100% |
| Vihtavuori N165 | <<locked>> | 98% | 53,635 psi | 88% | 3045 fps | 99% |
| Vihtavuori N550 | <<locked>> | 88% | 53,867 psi | 88% | 3058 fps | 100% |
| Vihtavuori N555 | <<locked>> | 94% | 51,938 psi | 85% | 3074 fps | 100% |
| Vihtavuori N560 | <<locked>> | 94% | 51,808 psi | 85% | 3130 fps | 96.8% |
| Vihtavuori N565ᴾ | <<locked>> | 100% | 51,256 psi | 84% | 3100 fps | 97% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 54,157 psi | 89% | 3012 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 52,402 psi | 86% | 3071 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 53,069 psi | 87% | 3235 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 96% | 54,404 psi | 89% | 3068 fps | 98.6% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 82% | 32,416 psi | 53% | 2612 fps | 95.5% |
| Accurate 4350 | <<locked>> | 80% | 40,988 psi | 67% | 2835 fps | 99.3% |
| Accurate MAGPRO | <<locked>> | 94% | 50,720 psi | 83% | 3110 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 49,385 psi | 81% | 2933 fps | 100% |
| ADI AR 2209 | <<locked>> | 84% | 39,363 psi | 65% | 2812 fps | 95% |
| ADI AR 2213 | <<locked>> | 92% | 46,006 psi | 76% | 2989 fps | 95.6% |
| ADI AR 2225 | <<locked>> | 98% | 36,448 psi | 60% | 2815 fps | 96% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 50,372 psi | 83% | 2963 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 39,465 psi | 65% | 2844 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 45,281 psi | 74% | 2976 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 84% | 39,334 psi | 65% | 2812 fps | 95.1% |
| Alliant Reloder-22 | <<locked>> | 88% | 39,784 psi | 65% | 2867 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 29,240 psi | 48% | 2589 fps | 97.9% |
| Alliant Reloder-25 | <<locked>> | 86% | 31,154 psi | 51% | 2661 fps | 95.5% |
| Alliant Reloder-26 | 61.3 gr | 80% | 31,473 psi | 52% | 2710 fps | 96.6% |
| Bofors RP15 | <<locked>> | 90% | 39,262 psi | 64% | 2851 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 50,923 psi | 84% | 2976 fps | 100% |
| Bofors RP30 | <<locked>> | 98% | 41,829 psi | 69% | 2943 fps | 95.3% |
| Bofors RP5 | <<locked>> | 88% | 39,784 psi | 65% | 2867 fps | 95.5% |
| Bofors RP7 | <<locked>> | 80% | 44,541 psi | 73% | 2848 fps | 97.6% |
| Hodgdon H1000 | <<locked>> | 96% | 42,235 psi | 69% | 2897 fps | 95.4% |
| Hodgdon H380 | <<locked>> | 80% | 51,053 psi | 84% | 2989 fps | 99.9% |
| Hodgdon H414 | <<locked>> | 80% | 42,830 psi | 70% | 2884 fps | 97.8% |
| Hodgdon H4350 | <<locked>> | 80% | 45,527 psi | 75% | 2904 fps | 97.2% |
| Hodgdon H4831 | <<locked>> | 92% | 49,182 psi | 81% | 2995 fps | 95.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 48,283 psi | 79% | 2979 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 37,043 psi | 61% | 2726 fps | 99.7% |
| Hodgdon Retumbo | <<locked>> | 94% | 39,218 psi | 64% | 2930 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 41,858 psi | 69% | 2900 fps | 97.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,427 psi | 45% | 1729 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 40,045 psi | 66% | 2769 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 80% | 45,788 psi | 75% | 2877 fps | 98.3% |
| IMR 4831 | <<locked>> | 80% | 39,160 psi | 64% | 2782 fps | 99.1% |
| IMR 4955 Enduron | <<locked>> | 90% | 47,776 psi | 78% | 2930 fps | 95.7% |
| IMR 7828 SSC | <<locked>> | 92% | 43,888 psi | 72% | 2956 fps | 95.1% |
| Lovex S065 | <<locked>> | 80% | 43,482 psi | 71% | 2825 fps | 98.9% |
| Lovex S070 | <<locked>> | 80% | 41,727 psi | 69% | 2808 fps | 97.7% |
| Lovex S071 | <<locked>> | 86% | 31,792 psi | 52% | 2595 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 39,755 psi | 65% | 2802 fps | 95% |
| Norma MRP | 62.5 gr | 84% | 36,390 psi | 60% | 2812 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 40,553 psi | 67% | 2828 fps | 99.2% |
| Ramshot Grand | <<locked>> | 92% | 43,700 psi | 72% | 2963 fps | 95.5% |
| Ramshot Hunter | <<locked>> | 80% | 39,421 psi | 65% | 2815 fps | 97.7% |
| Ramshot Magnum | <<locked>> | 92% | 39,059 psi | 64% | 2835 fps | 96% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,021 psi | 46% | 1772 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 51,010 psi | 84% | 2976 fps | 99.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 48,037 psi | 79% | 3028 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 40,785 psi | 67% | 2854 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 39,305 psi | 65% | 2864 fps | 98.8% |
| ReloadSwiss RS 76 | <<locked>> | 92% | 36,158 psi | 59% | 2841 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 48,022 psi | 79% | 2923 fps | 100% |
| Rottweil R 904 | <<locked>> | 86% | 43,613 psi | 72% | 2854 fps | 95.1% |
| Rottweil R 905 | <<locked>> | 84% | 38,421 psi | 63% | 2789 fps | 95% |
| Rottweil R 907 | <<locked>> | 80% | 44,541 psi | 73% | 2848 fps | 97.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 43,482 psi | 71% | 2825 fps | 98.9% |
| Shooters World SW4350 | <<locked>> | 80% | 41,727 psi | 69% | 2808 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 49,313 psi | 81% | 2979 fps | 100% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 48,704 psi | 80% | 2808 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 42,453 psi | 70% | 2766 fps | 97.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 86% | 40,712 psi | 67% | 2848 fps | 95.8% |
| Somchem S355 | <<locked>> | 80% | 48,138 psi | 79% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 88% | 47,703 psi | 78% | 2904 fps | 95.4% |
| Somchem S365 | <<locked>> | 80% | 37,144 psi | 61% | 2782 fps | 100% |
| Somchem S385 | <<locked>> | 82% | 36,637 psi | 60% | 2717 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 45,992 psi | 76% | 2841 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 41,930 psi | 69% | 2825 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 88% | 38,537 psi | 63% | 2753 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 41,307 psi | 68% | 2825 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 80% | 32,561 psi | 53% | 2671 fps | 97.9% |
| Vihtavuori N560 | 66.9 gr | 90% | 45,063 psi | 74% | 2995 fps | 95% |
| Vihtavuori N565 | <<locked>> | 96% | 44,701 psi | 73% | 2972 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 40,901 psi | 67% | 2785 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 43,033 psi | 71% | 2890 fps | 97.9% |
| Winchester StaBALL HD | <<locked>> | 80% | 25,904 psi | 43% | 2572 fps | 97.3% |
| Winchester Supreme 780 | <<locked>> | 88% | 41,002 psi | 67% | 2815 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 80 powders for 7 mm Blaser Mag. loaded with the .284 | 140gr | Sierra GameKing. Winchester StaBALL HD delivers the highest muzzle velocity at 3,235 fps; across all powders the maximum-charge window runs from 1,932 fps to 3,235 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 (420 MPa), the top charges use 56–90 %, 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. Norma MRP, Vihtavuori N560, Alliant Reloder-26 rank at the top here: for 7 mm Blaser 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.