Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 139gr | Sellier & Bellot SPRN bullet and 40 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, Alliant Reloder-16 and Somchem S365.
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: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 82% | 41,089 psi | 86% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,714 psi | 89% | 2779 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 84% | 42,583 psi | 89% | 2690 fps | 98.4% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,091 psi | 90% | 2831 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,337 psi | 88% | 2717 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,772 psi | 89% | 2733 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,076 psi | 88% | 2789 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,989 psi | 88% | 2815 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,406 psi | 80% | 2736 fps | 98.6% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,033 psi | 90% | 2900 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 42,148 psi | 88% | 2723 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 84% | 43,091 psi | 90% | 2730 fps | 97.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,336 psi | 86% | 2723 fps | 99.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,346 psi | 74% | 1775 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,148 psi | 88% | 2677 fps | 98.5% |
| IMR 4831 | <<locked>> | 92% | 40,785 psi | 85% | 2723 fps | 97.7% |
| Lovex S062 | <<locked>> | 82% | 42,032 psi | 88% | 2680 fps | 99.6% |
| Lovex S065 | <<locked>> | 88% | 41,466 psi | 87% | 2667 fps | 96.3% |
| Norma 203B | <<locked>> | 82% | 42,119 psi | 88% | 2720 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 42,409 psi | 89% | 2772 fps | 97.9% |
| Ramshot Big Game | <<locked>> | 82% | 41,684 psi | 87% | 2733 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 92% | 41,742 psi | 87% | 2762 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,969 psi | 75% | 1821 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,843 psi | 87% | 2818 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,293 psi | 88% | 2799 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,293 psi | 88% | 2808 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 86% | 42,279 psi | 88% | 2720 fps | 99.3% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,466 psi | 87% | 2667 fps | 96.3% |
| Shooters World Precision | <<locked>> | 82% | 42,032 psi | 88% | 2680 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 40,785 psi | 85% | 2720 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,177 psi | 88% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,033 psi | 90% | 2723 fps | 99.3% |
| Somchem S365 | <<locked>> | 94% | 40,712 psi | 85% | 2782 fps | 99.8% |
| Vihtavuori N150 | <<locked>> | 86% | 41,118 psi | 86% | 2654 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 90% | 41,698 psi | 87% | 2717 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 42,482 psi | 89% | 2674 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 40,959 psi | 86% | 2720 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,134 psi | 88% | 2818 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,698 psi | 87% | 2697 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,432 psi | 72% | 2733 fps | 98.4% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 4064 | <<locked>> | 80% | 38,609 psi | 81% | 2628 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 34,650 psi | 72% | 2605 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 37,739 psi | 79% | 2589 fps | 97.3% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,292 psi | 84% | 2769 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,231 psi | 78% | 2612 fps | 98.6% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,016 psi | 84% | 2674 fps | 98% |
| Alliant Reloder-16 | 43.3 gr | 84% | 32,909 psi | 69% | 2562 fps | 95% |
| Alliant Reloder-17 | 44.4 gr | 80% | 32,227 psi | 67% | 2575 fps | 96.7% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,124 psi | 63% | 2516 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,940 psi | 73% | 2703 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 36,956 psi | 77% | 2615 fps | 98.6% |
| Hodgdon H380 | <<locked>> | 80% | 37,666 psi | 79% | 2615 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,340 psi | 59% | 2408 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,455 psi | 55% | 1588 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,624 psi | 83% | 2625 fps | 98% |
| IMR 4831 | <<locked>> | 86% | 33,591 psi | 70% | 2562 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 39,552 psi | 83% | 2628 fps | 99.3% |
| Lovex S065 | <<locked>> | 86% | 39,044 psi | 82% | 2618 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 39,407 psi | 82% | 2661 fps | 98.4% |
| Norma URP | <<locked>> | 86% | 35,012 psi | 73% | 2608 fps | 95.7% |
| Ramshot Big Game | <<locked>> | 80% | 39,001 psi | 81% | 2677 fps | 98.1% |
| Ramshot Hunter | <<locked>> | 90% | 39,073 psi | 82% | 2703 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,614 psi | 56% | 1624 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,287 psi | 72% | 2644 fps | 99.4% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,490 psi | 72% | 2621 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,101 psi | 78% | 2687 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 34,809 psi | 73% | 2559 fps | 97.9% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,044 psi | 82% | 2618 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 39,552 psi | 83% | 2628 fps | 99.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,665 psi | 75% | 2605 fps | 97.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,202 psi | 78% | 2510 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,592 psi | 74% | 2566 fps | 97.9% |
| Somchem S365 | 42.1 gr | 80% | 25,846 psi | 54% | 2388 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 33,924 psi | 71% | 2503 fps | 98.6% |
| Vihtavuori N160 | <<locked>> | 84% | 34,200 psi | 71% | 2552 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 39,755 psi | 83% | 2621 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 36,027 psi | 75% | 2612 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 92% | 32,300 psi | 67% | 2595 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,979 psi | 63% | 2418 fps | 95.9% |
| Winchester StaBALL HD | <<locked>> | 96% | 30,269 psi | 63% | 2598 fps | 96.2% |
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 40 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 139gr | Sellier & Bellot SPRN. Alliant Reloder-26 delivers the highest muzzle velocity at 2,900 fps; across all powders the maximum-charge window runs from 1,775 fps to 2,900 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 40 of the 40 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:15.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-26, Hodgdon TrailBoss 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-17, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 139gr | Sellier & Bellot SPRN 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.