Load Specifications
Load data in caliber 7 mm Blaser Mag. with .284 | 145gr | Speer Grand Slam bullet and 70 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Winchester StaBALL HD, 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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Max Load - Barrel Length: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 52,417 psi | 86% | 2989 fps | 99.9% |
| Accurate 4350 | <<locked>> | 86% | 53,809 psi | 88% | 3028 fps | 100% |
| Accurate MAGPRO | <<locked>> | 94% | 54,723 psi | 90% | 3143 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 92% | 54,766 psi | 90% | 3084 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 52,504 psi | 86% | 3081 fps | 97.9% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,079 psi | 77% | 2969 fps | 97% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 41,872 psi | 69% | 2923 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 88% | 54,679 psi | 90% | 3087 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 52,228 psi | 86% | 3048 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 92% | 54,375 psi | 89% | 3074 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 52,359 psi | 86% | 3081 fps | 98.9% |
| Alliant Reloder-23 | <<locked>> | 96% | 53,476 psi | 88% | 3061 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 52,794 psi | 87% | 3117 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 53,403 psi | 88% | 3146 fps | 100% |
| Bofors RP15 | <<locked>> | 98% | 54,940 psi | 90% | 3123 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 48,733 psi | 80% | 3045 fps | 97.8% |
| Bofors RP5 | <<locked>> | 94% | 52,359 psi | 86% | 3081 fps | 98.9% |
| Bofors RP7 | <<locked>> | 84% | 53,113 psi | 87% | 2976 fps | 99.4% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 51,880 psi | 85% | 3064 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 84% | 52,141 psi | 86% | 3025 fps | 99.6% |
| Hodgdon H4350 | <<locked>> | 84% | 54,766 psi | 90% | 3041 fps | 99.2% |
| Hodgdon H4831 | <<locked>> | 92% | 52,402 psi | 86% | 3018 fps | 97.2% |
| Hodgdon H4831 SC | <<locked>> | 94% | 55,071 psi | 90% | 3061 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 55,013 psi | 90% | 3005 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 51,677 psi | 85% | 3182 fps | 99.6% |
| Hodgdon Superformance | <<locked>> | 84% | 52,170 psi | 86% | 3058 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,883 psi | 61% | 1919 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 54,694 psi | 90% | 3015 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 54,549 psi | 90% | 3002 fps | 99.7% |
| IMR 4831 | <<locked>> | 88% | 54,360 psi | 89% | 3022 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 53,809 psi | 88% | 3009 fps | 97.7% |
| IMR 7828 SSC | <<locked>> | 96% | 53,853 psi | 88% | 3117 fps | 98.2% |
| Lovex S065 | <<locked>> | 84% | 51,822 psi | 85% | 2946 fps | 99.9% |
| Lovex S070 | <<locked>> | 86% | 53,417 psi | 88% | 2995 fps | 99.8% |
| Lovex S071ᴾ | <<locked>> | 100% | 53,679 psi | 88% | 3009 fps | 100% |
| Norma 204 | <<locked>> | 86% | 51,822 psi | 85% | 3009 fps | 98.6% |
| Norma 217ᴾ | <<locked>> | 100% | 37,231 psi | 61% | 2838 fps | 96.6% |
| Norma MRP | <<locked>> | 92% | 51,982 psi | 85% | 3100 fps | 99.6% |
| Norma URP | <<locked>> | 86% | 52,634 psi | 86% | 3015 fps | 100% |
| Ramshot Grand | <<locked>> | 96% | 54,549 psi | 90% | 3140 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 54,824 psi | 90% | 3071 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 52,750 psi | 87% | 3071 fps | 99.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,710 psi | 62% | 1965 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 53,969 psi | 89% | 3054 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 52,156 psi | 86% | 3081 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 52,272 psi | 86% | 3179 fps | 100% |
| Rottweil R 903 | <<locked>> | 82% | 54,230 psi | 89% | 2979 fps | 100% |
| Rottweil R 904 | <<locked>> | 90% | 52,721 psi | 87% | 2995 fps | 97.9% |
| Rottweil R 905 | <<locked>> | 92% | 53,853 psi | 88% | 3061 fps | 99.1% |
| Rottweil R 907 | <<locked>> | 84% | 53,113 psi | 87% | 2976 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 51,822 psi | 85% | 2946 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 86% | 53,417 psi | 88% | 2995 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 54,360 psi | 89% | 2851 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 54,534 psi | 90% | 2949 fps | 99.8% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 53,403 psi | 88% | 3058 fps | 99% |
| Somchem S355 | <<locked>> | 82% | 54,114 psi | 89% | 2976 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 54,070 psi | 89% | 2986 fps | 97.5% |
| Somchem S365 | <<locked>> | 88% | 52,707 psi | 87% | 3018 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 54,259 psi | 89% | 3031 fps | 99.5% |
| Vihtavuori N150 | <<locked>> | 82% | 51,750 psi | 85% | 2894 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 54,201 psi | 89% | 3002 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 53,751 psi | 88% | 3009 fps | 99.3% |
| Vihtavuori N550 | <<locked>> | 86% | 53,490 psi | 88% | 3009 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 52,127 psi | 86% | 3031 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 51,967 psi | 85% | 3091 fps | 97.4% |
| Vihtavuori N565 | <<locked>> | 98% | 51,576 psi | 85% | 3068 fps | 97.6% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 53,867 psi | 88% | 2963 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 52,402 psi | 86% | 3031 fps | 99.6% |
| Winchester StaBALL HD | <<locked>> | 98% | 54,201 psi | 89% | 3196 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 94% | 54,143 psi | 89% | 3025 fps | 99% |
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>> | 80% | 32,590 psi | 54% | 2582 fps | 96.2% |
| Accurate 4350 | <<locked>> | 80% | 43,859 psi | 72% | 2854 fps | 99.8% |
| Accurate MAGPRO | <<locked>> | 90% | 47,514 psi | 78% | 3009 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 82% | 39,305 psi | 65% | 2776 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 88% | 42,801 psi | 70% | 2887 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 96% | 41,046 psi | 67% | 2835 fps | 95% |
| ADI AR 2225 | <<locked>> | 94% | 34,389 psi | 56% | 2726 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,105 psi | 69% | 2864 fps | 99.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 48,515 psi | 80% | 2989 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 82% | 39,218 psi | 64% | 2772 fps | 95.7% |
| Alliant Reloder-22 | <<locked>> | 84% | 37,231 psi | 61% | 2766 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,270 psi | 51% | 2612 fps | 99% |
| Alliant Reloder-25 | <<locked>> | 82% | 29,269 psi | 48% | 2569 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 80% | 33,982 psi | 56% | 2746 fps | 98.2% |
| Bofors RP15 | <<locked>> | 88% | 39,552 psi | 65% | 2818 fps | 95.8% |
| Bofors RP30 | <<locked>> | 94% | 39,566 psi | 65% | 2851 fps | 95.2% |
| Bofors RP5 | <<locked>> | 84% | 37,231 psi | 61% | 2766 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 46,818 psi | 77% | 2861 fps | 98.6% |
| Hodgdon H1000 | <<locked>> | 92% | 39,378 psi | 65% | 2802 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 45,687 psi | 75% | 2907 fps | 98.8% |
| Hodgdon H4350 | <<locked>> | 80% | 48,283 psi | 79% | 2923 fps | 98.3% |
| Hodgdon H4831 | <<locked>> | 88% | 45,716 psi | 75% | 2894 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 88% | 44,904 psi | 74% | 2874 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 39,711 psi | 65% | 2743 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 90% | 37,101 psi | 61% | 2841 fps | 95.6% |
| Hodgdon Superformance | <<locked>> | 80% | 44,889 psi | 74% | 2923 fps | 98.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,717 psi | 46% | 1719 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 42,395 psi | 70% | 2785 fps | 97.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 48,196 psi | 79% | 2887 fps | 99.1% |
| IMR 4831 | <<locked>> | 80% | 41,785 psi | 69% | 2799 fps | 99.7% |
| IMR 4955 Enduron | <<locked>> | 86% | 44,556 psi | 73% | 2831 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 90% | 44,005 psi | 72% | 2927 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 45,730 psi | 75% | 2835 fps | 99.5% |
| Lovex S070 | <<locked>> | 80% | 44,179 psi | 73% | 2822 fps | 98.7% |
| Lovex S071 | <<locked>> | 82% | 29,979 psi | 49% | 2507 fps | 95% |
| Norma 204 | <<locked>> | 80% | 42,163 psi | 69% | 2818 fps | 96.4% |
| Norma 217 | <<locked>> | 98% | 34,940 psi | 57% | 2776 fps | 95.6% |
| Norma MRP | 61.5 gr | 80% | 33,997 psi | 56% | 2710 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 43,221 psi | 71% | 2844 fps | 99.8% |
| Ramshot Grand | <<locked>> | 88% | 40,886 psi | 67% | 2871 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 80% | 41,930 psi | 69% | 2835 fps | 98.8% |
| Ramshot Magnum | <<locked>> | 88% | 36,390 psi | 60% | 2740 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,166 psi | 46% | 1755 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 43,700 psi | 72% | 2874 fps | 99.7% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,119 psi | 69% | 2890 fps | 99.6% |
| ReloadSwiss RS 76 | <<locked>> | 88% | 33,968 psi | 56% | 2746 fps | 95.4% |
| Rottweil R 903 | <<locked>> | 80% | 50,923 psi | 84% | 2927 fps | 100% |
| Rottweil R 904 | <<locked>> | 84% | 43,395 psi | 71% | 2818 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 82% | 38,377 psi | 63% | 2753 fps | 95.6% |
| Rottweil R 907 | <<locked>> | 80% | 46,818 psi | 77% | 2861 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 45,730 psi | 75% | 2835 fps | 99.5% |
| Shooters World SW4350 | <<locked>> | 80% | 44,179 psi | 73% | 2822 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 51,111 psi | 84% | 2805 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 44,947 psi | 74% | 2782 fps | 98.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 82% | 38,043 psi | 62% | 2746 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 50,676 psi | 83% | 2920 fps | 100% |
| Somchem S361 | <<locked>> | 84% | 44,295 psi | 73% | 2805 fps | 95.2% |
| Somchem S365 | <<locked>> | 80% | 40,016 psi | 66% | 2799 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 36,637 psi | 60% | 2680 fps | 96% |
| Vihtavuori N150 | <<locked>> | 80% | 48,631 psi | 80% | 2844 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 44,541 psi | 73% | 2838 fps | 99.8% |
| Vihtavuori N165 | <<locked>> | 84% | 36,172 psi | 59% | 2664 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 43,990 psi | 72% | 2841 fps | 99.7% |
| Vihtavuori N555 | <<locked>> | 80% | 35,172 psi | 58% | 2694 fps | 99% |
| Vihtavuori N560 | 67.6 gr | 88% | 45,165 psi | 74% | 2959 fps | 95.7% |
| Vihtavuori N565 | <<locked>> | 92% | 42,076 psi | 69% | 2877 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 43,613 psi | 72% | 2799 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 45,687 psi | 75% | 2907 fps | 98.8% |
| Winchester StaBALL HD | 60.8 gr | 80% | 27,746 psi | 46% | 2612 fps | 98.9% |
| Winchester Supreme 780 | <<locked>> | 84% | 38,319 psi | 63% | 2720 fps | 95.4% |
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 76 powders for 7 mm Blaser Mag. loaded with the .284 | 145gr | Speer Grand Slam. Winchester StaBALL HD delivers the highest muzzle velocity at 3,196 fps; across all powders the maximum-charge window runs from 1,919 fps to 3,196 fps. ADI AR 2217 gives the best case fill at 100 %, and 76 of the 76 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (420 MPa), the top charges use 61–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:13.0 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, Norma MRP, Vihtavuori N560 rank at the top here: for 7 mm Blaser Mag. with the .284 | 145gr | Speer Grand Slam they combine a high case fill with complete burn and sit in the upper velocity band. As outliers, IMR 8133 Enduron, Vihtavuori N170, Vihtavuori N570 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.