Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 139gr | Hornady SP bullet and 47 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Somchem S365, Alliant Reloder-17 and ReloadSwiss RS 62.
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 2495 | <<locked>> | 82% | 41,510 psi | 87% | 2635 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 41,785 psi | 87% | 2677 fps | 100% |
| Accurate 4350 | <<locked>> | 94% | 42,931 psi | 90% | 2769 fps | 97.9% |
| ADI AR 2208 | <<locked>> | 84% | 40,843 psi | 85% | 2638 fps | 97.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,191 psi | 86% | 2772 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 86% | 43,120 psi | 90% | 2717 fps | 99.4% |
| Alliant Reloder-15 | <<locked>> | 82% | 40,872 psi | 85% | 2677 fps | 98% |
| Alliant Reloder-16 | <<locked>> | 94% | 42,714 psi | 89% | 2782 fps | 98% |
| Alliant Reloder-17 | <<locked>> | 90% | 42,917 psi | 90% | 2815 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,593 psi | 76% | 2674 fps | 97.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,596 psi | 85% | 2825 fps | 96.8% |
| Bofors RP3 | <<locked>> | 86% | 42,960 psi | 90% | 2723 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 84% | 41,118 psi | 86% | 2671 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 41,916 psi | 88% | 2720 fps | 99% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 41,350 psi | 86% | 2723 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,085 psi | 73% | 1749 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 42,902 psi | 90% | 2674 fps | 98.4% |
| IMR 4831 | <<locked>> | 94% | 41,220 psi | 86% | 2717 fps | 97.5% |
| IMR 4895 | <<locked>> | 82% | 41,858 psi | 87% | 2707 fps | 98.7% |
| Lovex S062 | <<locked>> | 84% | 42,728 psi | 89% | 2677 fps | 99.5% |
| Lovex S065 | <<locked>> | 90% | 42,134 psi | 88% | 2664 fps | 96.2% |
| Norma 203B | <<locked>> | 84% | 42,859 psi | 90% | 2717 fps | 98.8% |
| Norma URP | <<locked>> | 94% | 42,946 psi | 90% | 2766 fps | 97.8% |
| Ramshot Big Game | <<locked>> | 84% | 42,612 psi | 89% | 2736 fps | 98.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,708 psi | 75% | 1795 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 42,685 psi | 89% | 2776 fps | 98.3% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 42,699 psi | 89% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 42,670 psi | 89% | 2789 fps | 97.5% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,451 psi | 85% | 2746 fps | 96.1% |
| Rottweil R 902 | <<locked>> | 82% | 42,206 psi | 88% | 2644 fps | 99.4% |
| Rottweil R 903 | <<locked>> | 88% | 42,844 psi | 90% | 2717 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,134 psi | 88% | 2664 fps | 96.2% |
| Shooters World Precision | <<locked>> | 84% | 42,728 psi | 89% | 2677 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 41,394 psi | 86% | 2717 fps | 98.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 86% | 42,975 psi | 90% | 2602 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 41,176 psi | 86% | 2671 fps | 98.8% |
| Somchem S365 | <<locked>> | 96% | 41,031 psi | 86% | 2772 fps | 99.7% |
| Vihtavuori N135 | <<locked>> | 82% | 41,408 psi | 87% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 42,134 psi | 88% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 41,742 psi | 87% | 2651 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 42,221 psi | 88% | 2713 fps | 97.5% |
| Vihtavuori N540 | <<locked>> | 82% | 40,741 psi | 85% | 2628 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 41,481 psi | 87% | 2717 fps | 97.1% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,450 psi | 82% | 2753 fps | 97.8% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 42,656 psi | 89% | 2697 fps | 99.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,590 psi | 68% | 2651 fps | 97% |
| Winchester StaBALL Match | <<locked>> | 82% | 43,047 psi | 90% | 2713 fps | 99.2% |
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 2495 | <<locked>> | 80% | 38,841 psi | 81% | 2585 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 36,709 psi | 77% | 2575 fps | 99.9% |
| Accurate 4350 | <<locked>> | 88% | 34,925 psi | 73% | 2598 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 36,201 psi | 76% | 2539 fps | 96.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,421 psi | 80% | 2707 fps | 97% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,607 psi | 74% | 2559 fps | 98% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,363 psi | 80% | 2621 fps | 97.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 35,650 psi | 74% | 2618 fps | 95.7% |
| Alliant Reloder-17 | 42.4 gr | 80% | 30,632 psi | 64% | 2513 fps | 95.5% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,458 psi | 64% | 2510 fps | 95.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 37,840 psi | 79% | 2756 fps | 95.7% |
| Bofors RP3 | <<locked>> | 80% | 35,041 psi | 73% | 2559 fps | 98% |
| Hodgdon H380 | <<locked>> | 80% | 35,897 psi | 75% | 2559 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 86% | 30,603 psi | 64% | 2457 fps | 95.7% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 38,798 psi | 81% | 2667 fps | 98.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,107 psi | 55% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 37,985 psi | 79% | 2572 fps | 97.3% |
| IMR 4831 | <<locked>> | 88% | 33,866 psi | 71% | 2556 fps | 95.2% |
| IMR 4895 | <<locked>> | 80% | 39,276 psi | 82% | 2654 fps | 98.1% |
| Lovex S062 | <<locked>> | 80% | 37,869 psi | 79% | 2579 fps | 98.8% |
| Lovex S065 | <<locked>> | 88% | 39,610 psi | 83% | 2612 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 37,753 psi | 79% | 2612 fps | 97.7% |
| Norma URP | <<locked>> | 88% | 35,404 psi | 74% | 2602 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 37,072 psi | 77% | 2618 fps | 97.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,484 psi | 55% | 1604 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 39,914 psi | 83% | 2723 fps | 97.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,590 psi | 68% | 2582 fps | 98.8% |
| ReloadSwiss RS 62 | 46.6 gr | 88% | 34,751 psi | 73% | 2615 fps | 95% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 37,768 psi | 79% | 2684 fps | 95% |
| Rottweil R 902 | <<locked>> | 80% | 39,610 psi | 83% | 2595 fps | 99.1% |
| Rottweil R 903 | <<locked>> | 80% | 32,953 psi | 69% | 2503 fps | 97% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,610 psi | 83% | 2612 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 37,869 psi | 79% | 2579 fps | 98.8% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,011 psi | 71% | 2552 fps | 96.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,795 psi | 75% | 2467 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,011 psi | 71% | 2513 fps | 97.1% |
| Somchem S365 | 41.3 gr | 82% | 26,281 psi | 55% | 2388 fps | 95.1% |
| Vihtavuori N135 | <<locked>> | 80% | 38,972 psi | 81% | 2582 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,537 psi | 83% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,198 psi | 67% | 2448 fps | 97.9% |
| Vihtavuori N160 | <<locked>> | 86% | 34,824 psi | 73% | 2552 fps | 95.2% |
| Vihtavuori N540 | <<locked>> | 80% | 38,043 psi | 79% | 2575 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 88% | 36,550 psi | 76% | 2608 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 94% | 32,430 psi | 68% | 2585 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 82% | 30,647 psi | 64% | 2421 fps | 95.8% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,647 psi | 64% | 2585 fps | 95.8% |
| Winchester StaBALL Match | <<locked>> | 80% | 40,437 psi | 84% | 2661 fps | 98.8% |
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 47 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 139gr | Hornady SP. Alliant Reloder-26 delivers the highest muzzle velocity at 2,825 fps; across all powders the maximum-charge window runs from 1,749 fps to 2,825 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 47 of the 47 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 68–90 %, leaving at least 10 % headroom. The 139.0 gr projectile in 0.284" calls for a 1:12.0 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. Somchem S365, Alliant Reloder-17, ReloadSwiss RS 62 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 139gr | Hornady SP 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.