Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 140gr | Impala RNFP KO bullet and 39 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-17, ReloadSwiss RS 62 and Alliant Reloder-16.
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% | 42,656 psi | 89% | 2641 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,047 psi | 90% | 2730 fps | 97.7% |
| ADI AR 2208 | <<locked>> | 84% | 43,004 psi | 90% | 2641 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,091 psi | 90% | 2769 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,859 psi | 90% | 2671 fps | 99.3% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,221 psi | 90% | 2680 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,134 psi | 88% | 2726 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,264 psi | 88% | 2759 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,943 psi | 81% | 2687 fps | 98.3% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,902 psi | 90% | 2831 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 42,888 psi | 90% | 2677 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 82% | 41,118 psi | 86% | 2628 fps | 96.6% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,553 psi | 87% | 2671 fps | 98.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,868 psi | 75% | 1736 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,525 psi | 89% | 2625 fps | 98.2% |
| IMR 4831 | <<locked>> | 92% | 41,205 psi | 86% | 2674 fps | 97.4% |
| Lovex S062 | <<locked>> | 82% | 42,801 psi | 89% | 2635 fps | 99.5% |
| Lovex S065 | <<locked>> | 88% | 42,192 psi | 88% | 2625 fps | 96% |
| Norma 203B | <<locked>> | 82% | 42,598 psi | 89% | 2671 fps | 98.6% |
| Norma URP | <<locked>> | 92% | 42,598 psi | 89% | 2720 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 82% | 41,785 psi | 87% | 2677 fps | 98.3% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,361 psi | 76% | 1778 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,989 psi | 88% | 2766 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,424 psi | 89% | 2743 fps | 97.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,569 psi | 89% | 2749 fps | 96.5% |
| Rottweil R 903 | <<locked>> | 86% | 43,091 psi | 90% | 2677 fps | 99.2% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,192 psi | 88% | 2625 fps | 96% |
| Shooters World Precision | <<locked>> | 82% | 42,801 psi | 89% | 2635 fps | 99.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 40,901 psi | 85% | 2667 fps | 98.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,482 psi | 89% | 2552 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 41,220 psi | 86% | 2628 fps | 98.7% |
| Somchem S365 | <<locked>> | 94% | 40,712 psi | 85% | 2726 fps | 99.6% |
| Vihtavuori N150 | <<locked>> | 86% | 41,626 psi | 87% | 2608 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 90% | 41,843 psi | 87% | 2664 fps | 97.2% |
| Vihtavuori N540 | <<locked>> | 82% | 43,076 psi | 90% | 2631 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 41,379 psi | 86% | 2674 fps | 96.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,134 psi | 88% | 2766 fps | 98.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,930 psi | 88% | 2641 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,027 psi | 73% | 2677 fps | 97.9% |
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% | 40,393 psi | 84% | 2598 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 35,694 psi | 75% | 2572 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,319 psi | 80% | 2543 fps | 97% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,553 psi | 85% | 2713 fps | 97.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,072 psi | 80% | 2569 fps | 98.4% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,669 psi | 85% | 2628 fps | 97.8% |
| Alliant Reloder-16 | 41.2 gr | 86% | 35,636 psi | 74% | 2575 fps | 95.5% |
| Alliant Reloder-17 | 41.2 gr | 80% | 32,880 psi | 69% | 2533 fps | 96.4% |
| Alliant Reloder-23 | <<locked>> | 92% | 31,082 psi | 65% | 2480 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 96% | 37,753 psi | 79% | 2713 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 37,884 psi | 79% | 2575 fps | 98.5% |
| Hodgdon H380 | <<locked>> | 80% | 38,653 psi | 81% | 2575 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 30,995 psi | 65% | 2425 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,672 psi | 56% | 1549 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,190 psi | 84% | 2575 fps | 97.7% |
| IMR 4831 | <<locked>> | 86% | 34,418 psi | 72% | 2526 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 40,306 psi | 84% | 2582 fps | 99.1% |
| Lovex S065 | <<locked>> | 86% | 39,769 psi | 83% | 2572 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 40,074 psi | 84% | 2618 fps | 98.1% |
| Norma URP | <<locked>> | 86% | 35,650 psi | 74% | 2566 fps | 95.4% |
| Ramshot Big Game | <<locked>> | 80% | 39,349 psi | 82% | 2628 fps | 97.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,166 psi | 57% | 1588 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,809 psi | 73% | 2598 fps | 99.2% |
| ReloadSwiss RS 62 | 45.3 gr | 88% | 37,362 psi | 78% | 2635 fps | 95.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 39,885 psi | 83% | 2690 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 35,955 psi | 75% | 2526 fps | 97.8% |
| Shooters World Long Rifle | <<locked>> | 86% | 39,769 psi | 83% | 2572 fps | 95.2% |
| Shooters World Precision | <<locked>> | 80% | 40,306 psi | 84% | 2582 fps | 99.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,230 psi | 76% | 2562 fps | 97% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,913 psi | 79% | 2467 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,680 psi | 77% | 2530 fps | 97.7% |
| Somchem S365 | <<locked>> | 80% | 27,122 psi | 57% | 2369 fps | 95.4% |
| Vihtavuori N150 | <<locked>> | 80% | 34,751 psi | 73% | 2464 fps | 98.4% |
| Vihtavuori N160 | <<locked>> | 84% | 35,027 psi | 73% | 2513 fps | 95% |
| Vihtavuori N540 | <<locked>> | 80% | 40,567 psi | 85% | 2582 fps | 100% |
| Vihtavuori N550 | <<locked>> | 86% | 36,637 psi | 77% | 2569 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 92% | 33,199 psi | 69% | 2562 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,908 psi | 65% | 2385 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 96% | 31,227 psi | 65% | 2559 fps | 95.8% |
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 39 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 140gr | Impala RNFP KO. Alliant Reloder-26 delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,736 fps to 2,831 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 39 of the 39 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 73–90 %, leaving at least 10 % headroom. The 140.0 gr projectile in 0.284" calls for a 1:11.0 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, ReloadSwiss RS 62, Alliant Reloder-16 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 140gr | Impala RNFP KO 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.