Load Specifications
Load data in caliber 7 mm Blaser Mag. with .284 | 155gr | Geco EXPRESS bullet and 71 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 Accurate MAGPRO.
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: 25.6"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 53,664 psi | 88% | 2913 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 54,839 psi | 90% | 2946 fps | 100% |
| Accurate MAGPRO | <<locked>> | 92% | 52,098 psi | 86% | 3005 fps | 97.4% |
| ADI AR 2209 | <<locked>> | 90% | 52,025 psi | 85% | 2946 fps | 99.1% |
| ADI AR 2213 | <<locked>> | 94% | 53,476 psi | 88% | 3009 fps | 98.5% |
| ADI AR 2217ᴾ | <<locked>> | 100% | 47,964 psi | 79% | 2900 fps | 97.8% |
| ADI AR 2225ᴾ | <<locked>> | 100% | 42,569 psi | 70% | 2861 fps | 99.2% |
| Alliant Power Pro Varmint | <<locked>> | 90% | 52,417 psi | 86% | 2943 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 86% | 52,199 psi | 86% | 2949 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 82% | 53,272 psi | 87% | 2966 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 90% | 51,808 psi | 85% | 2936 fps | 99.1% |
| Alliant Reloder-22 | <<locked>> | 94% | 53,417 psi | 88% | 3005 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 96% | 54,505 psi | 89% | 2979 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 53,621 psi | 88% | 3035 fps | 100% |
| Alliant Reloder-26 | <<locked>> | 92% | 54,607 psi | 90% | 3068 fps | 100% |
| Bofors RP15 | <<locked>> | 96% | 52,373 psi | 86% | 2989 fps | 99.2% |
| Bofors RP30ᴾ | <<locked>> | 100% | 49,647 psi | 82% | 2972 fps | 98.4% |
| Bofors RP5 | <<locked>> | 94% | 53,417 psi | 88% | 3005 fps | 99.4% |
| Bofors RP7 | <<locked>> | 84% | 54,012 psi | 89% | 2894 fps | 99.7% |
| Hodgdon H1000ᴾ | <<locked>> | 100% | 52,678 psi | 86% | 2989 fps | 99.1% |
| Hodgdon H414 | <<locked>> | 84% | 53,113 psi | 87% | 2946 fps | 99.9% |
| Hodgdon H4350 | <<locked>> | 82% | 52,272 psi | 86% | 2904 fps | 99.3% |
| Hodgdon H4831 | <<locked>> | 92% | 53,519 psi | 88% | 2946 fps | 97.9% |
| Hodgdon H4831 SC | <<locked>> | 92% | 52,272 psi | 86% | 2923 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 88% | 52,547 psi | 86% | 2874 fps | 100% |
| Hodgdon Retumboᴾ | <<locked>> | 100% | 52,576 psi | 86% | 3107 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 84% | 53,113 psi | 87% | 2982 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,941 psi | 61% | 1847 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 52,083 psi | 86% | 2881 fps | 99.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 52,141 psi | 86% | 2864 fps | 99.7% |
| IMR 4831 | <<locked>> | 86% | 51,750 psi | 85% | 2884 fps | 100% |
| IMR 4955 Enduron | <<locked>> | 92% | 54,752 psi | 90% | 2933 fps | 98.3% |
| IMR 7828 SSC | <<locked>> | 96% | 55,013 psi | 90% | 3045 fps | 98.8% |
| Lovex S065 | <<locked>> | 84% | 52,692 psi | 87% | 2864 fps | 100% |
| Lovex S070 | <<locked>> | 86% | 54,273 psi | 89% | 2913 fps | 99.9% |
| Lovex S071ᴾ | <<locked>> | 100% | 54,708 psi | 90% | 2930 fps | 100% |
| Norma 204 | <<locked>> | 86% | 52,678 psi | 86% | 2930 fps | 99% |
| Norma 217ᴾ | <<locked>> | 100% | 38,058 psi | 62% | 2779 fps | 97.5% |
| Norma MRP | <<locked>> | 92% | 53,113 psi | 87% | 3028 fps | 99.9% |
| Norma URP | <<locked>> | 86% | 53,563 psi | 88% | 2933 fps | 100% |
| Ramshot Grand | <<locked>> | 94% | 51,764 psi | 85% | 3002 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 86% | 52,199 psi | 86% | 2933 fps | 100% |
| Ramshot Magnum | <<locked>> | 98% | 53,853 psi | 88% | 2995 fps | 99.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,826 psi | 62% | 1890 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 54,984 psi | 90% | 2972 fps | 100% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 53,026 psi | 87% | 2995 fps | 100% |
| ReloadSwiss RS 76ᴾ | <<locked>> | 100% | 53,345 psi | 88% | 3107 fps | 100% |
| ReloadSwiss RS 80ᴾ | <<locked>> | 100% | 48,167 psi | 79% | 2982 fps | 96.8% |
| Rottweil R 904 | <<locked>> | 90% | 53,519 psi | 88% | 2917 fps | 98.5% |
| Rottweil R 905 | <<locked>> | 92% | 54,665 psi | 90% | 2982 fps | 99.5% |
| Rottweil R 907 | <<locked>> | 84% | 54,012 psi | 89% | 2894 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 52,692 psi | 87% | 2864 fps | 100% |
| Shooters World SW4350 | <<locked>> | 86% | 54,273 psi | 89% | 2913 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 51,764 psi | 85% | 2815 fps | 99.7% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 54,230 psi | 89% | 2976 fps | 99.4% |
| Somchem S355 | <<locked>> | 82% | 54,897 psi | 90% | 2887 fps | 100% |
| Somchem S361 | <<locked>> | 90% | 55,027 psi | 90% | 2910 fps | 98.1% |
| Somchem S365 | <<locked>> | 88% | 53,635 psi | 88% | 2933 fps | 100% |
| Somchem S385 | <<locked>> | 90% | 51,808 psi | 85% | 2900 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 82% | 52,794 psi | 87% | 2812 fps | 100% |
| Vihtavuori N160 | <<locked>> | 84% | 51,764 psi | 85% | 2871 fps | 100% |
| Vihtavuori N165 | <<locked>> | 96% | 54,810 psi | 90% | 2933 fps | 99.7% |
| Vihtavuori N550 | <<locked>> | 86% | 54,534 psi | 90% | 2930 fps | 100% |
| Vihtavuori N555 | <<locked>> | 92% | 53,156 psi | 87% | 2953 fps | 100% |
| Vihtavuori N560 | <<locked>> | 92% | 53,055 psi | 87% | 3018 fps | 98.1% |
| Vihtavuori N565 | <<locked>> | 98% | 52,736 psi | 87% | 2995 fps | 98.3% |
| Vihtavuori N568ᴾ | <<locked>> | 100% | 49,313 psi | 81% | 2986 fps | 96.4% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 54,665 psi | 90% | 2877 fps | 100% |
| Winchester 760 | <<locked>> | 84% | 53,113 psi | 87% | 2946 fps | 99.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 51,576 psi | 85% | 3058 fps | 100% |
| Winchester Supreme 780 | <<locked>> | 92% | 51,430 psi | 84% | 2890 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% | 33,431 psi | 55% | 2523 fps | 97.2% |
| Accurate 4350 | <<locked>> | 80% | 44,904 psi | 74% | 2782 fps | 100% |
| Accurate MAGPRO | 66.7 gr | 88% | 45,107 psi | 74% | 2874 fps | 95.7% |
| ADI AR 2209 | <<locked>> | 80% | 37,507 psi | 62% | 2651 fps | 95.7% |
| ADI AR 2213 | <<locked>> | 86% | 40,770 psi | 67% | 2756 fps | 95.4% |
| ADI AR 2217 | <<locked>> | 94% | 39,175 psi | 64% | 2713 fps | 95% |
| ADI AR 2225 | <<locked>> | 92% | 32,953 psi | 54% | 2615 fps | 96% |
| Alliant Power Pro Varmint | <<locked>> | 80% | 37,826 psi | 62% | 2654 fps | 95.8% |
| Alliant Reloder-16 | <<locked>> | 80% | 42,989 psi | 71% | 2789 fps | 100% |
| Alliant Reloder-17 | <<locked>> | 80% | 49,632 psi | 81% | 2910 fps | 100% |
| Alliant Reloder-19 | <<locked>> | 80% | 37,478 psi | 62% | 2648 fps | 95.8% |
| Alliant Reloder-22 | <<locked>> | 82% | 35,549 psi | 58% | 2641 fps | 95.2% |
| Alliant Reloder-23 | <<locked>> | 80% | 31,966 psi | 52% | 2549 fps | 99.5% |
| Alliant Reloder-25 | <<locked>> | 80% | 28,021 psi | 46% | 2454 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 80% | 34,795 psi | 57% | 2684 fps | 98.9% |
| Bofors RP15 | <<locked>> | 84% | 35,447 psi | 58% | 2638 fps | 95% |
| Bofors RP30 | <<locked>> | 92% | 37,855 psi | 62% | 2730 fps | 95.2% |
| Bofors RP5 | <<locked>> | 82% | 35,549 psi | 58% | 2641 fps | 95.2% |
| Bofors RP7 | <<locked>> | 80% | 47,616 psi | 78% | 2782 fps | 99% |
| Hodgdon H1000 | <<locked>> | 90% | 37,492 psi | 62% | 2677 fps | 95.1% |
| Hodgdon H414 | <<locked>> | 80% | 46,572 psi | 76% | 2831 fps | 99.3% |
| Hodgdon H4350 | <<locked>> | 80% | 49,095 psi | 81% | 2844 fps | 98.8% |
| Hodgdon H4831 | <<locked>> | 86% | 43,584 psi | 72% | 2762 fps | 95.6% |
| Hodgdon H4831 SC | <<locked>> | 86% | 42,772 psi | 70% | 2746 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 40,524 psi | 67% | 2667 fps | 100% |
| Hodgdon Retumbo | <<locked>> | 88% | 35,389 psi | 58% | 2717 fps | 95.7% |
| Hodgdon Superformance | <<locked>> | 80% | 45,934 psi | 75% | 2854 fps | 99.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,659 psi | 45% | 1650 fps | 100% |
| IMR 4350 | <<locked>> | 80% | 43,207 psi | 71% | 2717 fps | 98.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 49,008 psi | 80% | 2808 fps | 99.4% |
| IMR 4831 | <<locked>> | 80% | 42,685 psi | 70% | 2726 fps | 99.9% |
| IMR 4955 Enduron | <<locked>> | 84% | 42,554 psi | 70% | 2707 fps | 95.5% |
| IMR 7828 SSC | <<locked>> | 88% | 41,814 psi | 69% | 2792 fps | 95.9% |
| Lovex S065 | <<locked>> | 80% | 46,528 psi | 76% | 2759 fps | 99.8% |
| Lovex S070 | <<locked>> | 80% | 44,831 psi | 74% | 2749 fps | 99.1% |
| Lovex S071 | <<locked>> | 80% | 28,805 psi | 47% | 2398 fps | 95.2% |
| Norma 204 | <<locked>> | 80% | 42,989 psi | 71% | 2749 fps | 97.2% |
| Norma 217 | <<locked>> | 96% | 33,373 psi | 55% | 2654 fps | 95.6% |
| Norma MRP | <<locked>> | 80% | 34,650 psi | 57% | 2648 fps | 96.4% |
| Norma URP | <<locked>> | 80% | 43,888 psi | 72% | 2766 fps | 99.9% |
| Ramshot Grand | <<locked>> | 86% | 38,856 psi | 64% | 2740 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 80% | 42,772 psi | 70% | 2762 fps | 99.2% |
| Ramshot Magnum | <<locked>> | 86% | 34,534 psi | 57% | 2612 fps | 95.7% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 28,340 psi | 47% | 1690 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 44,715 psi | 73% | 2802 fps | 99.9% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 42,917 psi | 70% | 2818 fps | 99.9% |
| ReloadSwiss RS 76 | <<locked>> | 86% | 32,271 psi | 53% | 2621 fps | 95.4% |
| ReloadSwiss RS 80 | <<locked>> | 98% | 44,556 psi | 73% | 2907 fps | 95.7% |
| Rottweil R 904 | <<locked>> | 82% | 41,466 psi | 68% | 2690 fps | 95.8% |
| Rottweil R 905 | <<locked>> | 80% | 36,651 psi | 60% | 2628 fps | 95.7% |
| Rottweil R 907 | <<locked>> | 80% | 47,616 psi | 78% | 2782 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 46,528 psi | 76% | 2759 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 80% | 44,831 psi | 74% | 2749 fps | 99.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 45,614 psi | 75% | 2707 fps | 99.1% |
| SNPE Vectan Tubal 8000 | <<locked>> | 80% | 36,318 psi | 60% | 2625 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 51,590 psi | 85% | 2838 fps | 100% |
| Somchem S361 | <<locked>> | 82% | 42,163 psi | 69% | 2677 fps | 95.1% |
| Somchem S365 | <<locked>> | 80% | 41,017 psi | 67% | 2726 fps | 100% |
| Somchem S385 | <<locked>> | 80% | 37,318 psi | 61% | 2615 fps | 96.8% |
| Vihtavuori N150 | <<locked>> | 80% | 49,313 psi | 81% | 2759 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 45,498 psi | 75% | 2766 fps | 100% |
| Vihtavuori N165 | <<locked>> | 82% | 34,490 psi | 57% | 2543 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 44,788 psi | 74% | 2766 fps | 99.9% |
| Vihtavuori N555 | <<locked>> | 80% | 35,853 psi | 59% | 2628 fps | 99.4% |
| Vihtavuori N560 | 64 gr | 86% | 43,062 psi | 71% | 2828 fps | 95.8% |
| Vihtavuori N565 | <<locked>> | 90% | 40,118 psi | 66% | 2753 fps | 95.1% |
| Vihtavuori N568 | <<locked>> | 98% | 45,963 psi | 75% | 2920 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 44,440 psi | 73% | 2723 fps | 100% |
| Winchester 760 | <<locked>> | 80% | 46,572 psi | 76% | 2831 fps | 99.3% |
| Winchester StaBALL HD | 58.9 gr | 80% | 28,369 psi | 47% | 2562 fps | 99.6% |
| Winchester Supreme 780 | <<locked>> | 82% | 36,376 psi | 60% | 2592 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 71 powders for 7 mm Blaser Mag. loaded with the .284 | 155gr | Geco EXPRESS. Hodgdon Retumbo delivers the highest muzzle velocity at 3,107 fps; across all powders the maximum-charge window runs from 1,847 fps to 3,107 fps. ADI AR 2217 gives the best case fill at 100 %, and 71 of the 71 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 155.0 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. Winchester StaBALL HD, Vihtavuori N560, Accurate MAGPRO rank at the top here: for 7 mm Blaser Mag. with the .284 | 155gr | Geco EXPRESS they combine a high case fill with complete burn and sit in the upper velocity band. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.