Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 140gr | Speer TBBC 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% | 41,945 psi | 88% | 2631 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 42,221 psi | 88% | 2674 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 40,495 psi | 85% | 2713 fps | 97.4% |
| ADI AR 2208 | <<locked>> | 84% | 41,147 psi | 86% | 2638 fps | 97.9% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,553 psi | 87% | 2772 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 40,785 psi | 85% | 2664 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 82% | 41,249 psi | 86% | 2674 fps | 98.1% |
| Alliant Reloder-16 | <<locked>> | 94% | 43,076 psi | 90% | 2779 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 90% | 43,294 psi | 90% | 2815 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 36,912 psi | 77% | 2674 fps | 98% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 40,930 psi | 86% | 2825 fps | 97% |
| Bofors RP3 | <<locked>> | 84% | 40,350 psi | 84% | 2664 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 84% | 41,437 psi | 87% | 2671 fps | 97% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 42,308 psi | 88% | 2720 fps | 99.1% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 41,742 psi | 87% | 2723 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,317 psi | 74% | 1749 fps | 100% |
| IMR 4064 | <<locked>> | 84% | 43,265 psi | 90% | 2674 fps | 98.6% |
| IMR 4831 | <<locked>> | 94% | 41,626 psi | 87% | 2717 fps | 97.7% |
| IMR 4895 | <<locked>> | 82% | 42,264 psi | 88% | 2707 fps | 98.8% |
| Lovex S062 | <<locked>> | 84% | 43,076 psi | 90% | 2674 fps | 99.6% |
| Lovex S065 | <<locked>> | 90% | 42,496 psi | 89% | 2664 fps | 96.3% |
| Norma 203B | <<locked>> | 84% | 43,221 psi | 90% | 2717 fps | 98.9% |
| Norma URP | <<locked>> | 92% | 40,640 psi | 85% | 2710 fps | 97.3% |
| Ramshot Big Game | <<locked>> | 84% | 42,946 psi | 90% | 2733 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 42,569 psi | 89% | 2753 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,650 psi | 74% | 1788 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 82% | 43,134 psi | 90% | 2779 fps | 98.5% |
| ReloadSwiss RS 60 | <<locked>> | 88% | 43,047 psi | 90% | 2822 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 94% | 43,091 psi | 90% | 2789 fps | 97.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 40,785 psi | 85% | 2746 fps | 96.3% |
| Rottweil R 902 | <<locked>> | 82% | 42,540 psi | 89% | 2644 fps | 99.5% |
| Rottweil R 903 | <<locked>> | 88% | 43,265 psi | 90% | 2713 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,496 psi | 89% | 2664 fps | 96.3% |
| Shooters World Precision | <<locked>> | 84% | 43,076 psi | 90% | 2674 fps | 99.6% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 41,713 psi | 87% | 2717 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 40,886 psi | 85% | 2556 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 41,292 psi | 86% | 2664 fps | 98.9% |
| Somchem S365 | <<locked>> | 96% | 41,423 psi | 87% | 2772 fps | 99.8% |
| Vihtavuori N135 | <<locked>> | 82% | 41,843 psi | 87% | 2625 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 42,511 psi | 89% | 2635 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 42,134 psi | 88% | 2651 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 92% | 42,583 psi | 89% | 2713 fps | 97.6% |
| Vihtavuori N540 | <<locked>> | 82% | 41,075 psi | 86% | 2625 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 41,858 psi | 87% | 2717 fps | 97.3% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 39,856 psi | 83% | 2749 fps | 97.9% |
| Winchester 6.5 StaBALL | <<locked>> | 92% | 42,989 psi | 90% | 2697 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 32,880 psi | 69% | 2654 fps | 97.3% |
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% | 39,233 psi | 82% | 2582 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,101 psi | 78% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 88% | 35,331 psi | 74% | 2602 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 36,506 psi | 76% | 2536 fps | 96.7% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,769 psi | 81% | 2710 fps | 97.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 35,897 psi | 75% | 2559 fps | 98.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,696 psi | 81% | 2621 fps | 97.5% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,794 psi | 71% | 2562 fps | 95.1% |
| Alliant Reloder-17 | 42.5 gr | 80% | 30,879 psi | 65% | 2513 fps | 95.8% |
| Alliant Reloder-23 | <<locked>> | 94% | 30,734 psi | 64% | 2510 fps | 95.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 38,174 psi | 80% | 2759 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 35,418 psi | 74% | 2559 fps | 98.1% |
| Hodgdon H380 | <<locked>> | 80% | 36,260 psi | 76% | 2559 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 28,979 psi | 61% | 2405 fps | 95% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,175 psi | 82% | 2671 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 55% | 1565 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,319 psi | 80% | 2572 fps | 97.5% |
| IMR 4831 | <<locked>> | 88% | 34,229 psi | 72% | 2556 fps | 95.5% |
| IMR 4895 | <<locked>> | 80% | 39,610 psi | 83% | 2654 fps | 98.3% |
| Lovex S062 | <<locked>> | 80% | 38,000 psi | 79% | 2572 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 39,958 psi | 83% | 2612 fps | 95.6% |
| Norma 203B | <<locked>> | 80% | 38,072 psi | 80% | 2612 fps | 97.9% |
| Norma URP | <<locked>> | 88% | 35,752 psi | 75% | 2602 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 37,405 psi | 78% | 2618 fps | 97.5% |
| Ramshot Hunter | <<locked>> | 92% | 40,059 psi | 84% | 2700 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 55% | 1598 fps | 100% |
| ReloadSwiss RS 52 | <<locked>> | 80% | 40,292 psi | 84% | 2720 fps | 97.9% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 32,880 psi | 69% | 2585 fps | 98.9% |
| ReloadSwiss RS 62 | 46.7 gr | 88% | 35,099 psi | 73% | 2615 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 38,087 psi | 80% | 2684 fps | 95.3% |
| Rottweil R 902 | <<locked>> | 80% | 39,958 psi | 83% | 2592 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,272 psi | 70% | 2503 fps | 97.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 39,958 psi | 83% | 2612 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 38,000 psi | 79% | 2572 fps | 98.9% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,345 psi | 72% | 2552 fps | 96.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 35,868 psi | 75% | 2461 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,330 psi | 72% | 2513 fps | 97.3% |
| Somchem S365 | 41.3 gr | 82% | 26,368 psi | 55% | 2385 fps | 95.3% |
| Vihtavuori N135 | <<locked>> | 80% | 39,102 psi | 82% | 2575 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 39,871 psi | 83% | 2585 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,518 psi | 68% | 2448 fps | 98.1% |
| Vihtavuori N160 | <<locked>> | 86% | 35,114 psi | 73% | 2552 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 38,348 psi | 80% | 2572 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,418 psi | 72% | 2552 fps | 95% |
| Vihtavuori N555 | <<locked>> | 94% | 32,779 psi | 68% | 2585 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 28,921 psi | 60% | 2365 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 98% | 30,951 psi | 65% | 2592 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 47 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 140gr | Speer TBBC. 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 69–90 %, leaving at least 10 % headroom. The 140.0 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 | 140gr | Speer TBBC 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.