Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 140gr | Sierra SBT GameKing bullet and 46 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 70.
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% | 42,221 psi | 88% | 2641 fps | 100% |
| Accurate 4064 | <<locked>> | 84% | 42,511 psi | 89% | 2684 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 41,031 psi | 86% | 2726 fps | 97.6% |
| ADI AR 2208 | <<locked>> | 84% | 41,655 psi | 87% | 2651 fps | 98.1% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 41,771 psi | 87% | 2782 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 41,060 psi | 86% | 2674 fps | 99.2% |
| Alliant Reloder-15 | <<locked>> | 82% | 41,510 psi | 87% | 2684 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 92% | 40,886 psi | 85% | 2740 fps | 97.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 40,828 psi | 85% | 2766 fps | 99.1% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 37,275 psi | 78% | 2687 fps | 98.2% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 41,278 psi | 86% | 2838 fps | 97.2% |
| Bofors RP3 | <<locked>> | 84% | 40,886 psi | 85% | 2680 fps | 99.2% |
| Hodgdon H380 | <<locked>> | 84% | 41,989 psi | 88% | 2687 fps | 97.2% |
| Hodgdon Hybrid 100V | <<locked>> | 96% | 42,467 psi | 89% | 2726 fps | 99.2% |
| Hodgdon LEVERevolution | <<locked>> | 82% | 42,250 psi | 88% | 2733 fps | 99.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,244 psi | 74% | 1752 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,089 psi | 86% | 2631 fps | 98.2% |
| IMR 4831 | <<locked>> | 94% | 42,105 psi | 88% | 2730 fps | 97.9% |
| IMR 4895 | <<locked>> | 82% | 42,496 psi | 89% | 2717 fps | 98.9% |
| Lovex S062 | <<locked>> | 82% | 41,002 psi | 86% | 2638 fps | 99.4% |
| Lovex S065 | <<locked>> | 90% | 42,931 psi | 90% | 2677 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 40,843 psi | 85% | 2674 fps | 98.6% |
| Norma URP | <<locked>> | 92% | 41,118 psi | 86% | 2723 fps | 97.5% |
| Ramshot Big Game | <<locked>> | 84% | 43,163 psi | 90% | 2740 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 94% | 42,975 psi | 90% | 2766 fps | 96.1% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,592 psi | 74% | 1791 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 40,640 psi | 85% | 2772 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 40,872 psi | 85% | 2749 fps | 97.2% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 41,147 psi | 86% | 2759 fps | 96.5% |
| Rottweil R 902 | <<locked>> | 82% | 42,830 psi | 89% | 2654 fps | 99.6% |
| Rottweil R 903 | <<locked>> | 86% | 41,046 psi | 86% | 2677 fps | 99.1% |
| Shooters World Long Rifle | <<locked>> | 90% | 42,931 psi | 90% | 2677 fps | 96.5% |
| Shooters World Precision | <<locked>> | 82% | 41,002 psi | 86% | 2638 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 42,221 psi | 88% | 2730 fps | 98.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 41,133 psi | 86% | 2566 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 41,800 psi | 87% | 2677 fps | 99% |
| Somchem S365 | <<locked>> | 96% | 41,858 psi | 87% | 2785 fps | 99.9% |
| Vihtavuori N135 | <<locked>> | 82% | 42,134 psi | 88% | 2631 fps | 100% |
| Vihtavuori N140 | <<locked>> | 82% | 42,786 psi | 89% | 2641 fps | 100% |
| Vihtavuori N150 | <<locked>> | 88% | 42,612 psi | 89% | 2664 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 92% | 43,091 psi | 90% | 2726 fps | 97.8% |
| Vihtavuori N540 | <<locked>> | 82% | 41,336 psi | 86% | 2635 fps | 100% |
| Vihtavuori N550 | <<locked>> | 92% | 42,279 psi | 88% | 2726 fps | 97.5% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 40,321 psi | 84% | 2762 fps | 98.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 40,553 psi | 85% | 2651 fps | 99% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 33,373 psi | 70% | 2674 fps | 97.7% |
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% | 39,566 psi | 83% | 2592 fps | 100% |
| Accurate 4064 | <<locked>> | 80% | 37,391 psi | 78% | 2585 fps | 100% |
| Accurate 4350 | <<locked>> | 86% | 33,243 psi | 69% | 2556 fps | 95.1% |
| ADI AR 2208 | <<locked>> | 80% | 36,753 psi | 77% | 2546 fps | 96.8% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 38,972 psi | 81% | 2717 fps | 97.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 36,187 psi | 76% | 2569 fps | 98.3% |
| Alliant Reloder-15 | <<locked>> | 80% | 38,957 psi | 81% | 2631 fps | 97.7% |
| Alliant Reloder-16 | <<locked>> | 86% | 33,982 psi | 71% | 2572 fps | 95.3% |
| Alliant Reloder-17 | 42.9 gr | 80% | 31,256 psi | 65% | 2530 fps | 96.1% |
| Alliant Reloder-23 | <<locked>> | 94% | 31,053 psi | 65% | 2523 fps | 95.8% |
| Alliant Reloder-26 | <<locked>> | 96% | 35,911 psi | 75% | 2707 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 35,679 psi | 75% | 2569 fps | 98.3% |
| Hodgdon H380 | <<locked>> | 80% | 36,724 psi | 77% | 2572 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 84% | 29,153 psi | 61% | 2415 fps | 95.2% |
| Hodgdon LEVERevolution | <<locked>> | 80% | 39,407 psi | 82% | 2677 fps | 99% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,324 psi | 55% | 1568 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 38,580 psi | 81% | 2582 fps | 97.6% |
| IMR 4831 | <<locked>> | 88% | 34,664 psi | 72% | 2572 fps | 95.7% |
| IMR 4895 | <<locked>> | 80% | 39,900 psi | 83% | 2664 fps | 98.4% |
| Lovex S062 | <<locked>> | 80% | 38,479 psi | 80% | 2589 fps | 99% |
| Lovex S065 | <<locked>> | 86% | 38,000 psi | 79% | 2575 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 38,334 psi | 80% | 2621 fps | 98% |
| Norma URP | <<locked>> | 86% | 33,953 psi | 71% | 2562 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 37,637 psi | 79% | 2628 fps | 97.7% |
| Ramshot Hunter | <<locked>> | 92% | 40,176 psi | 84% | 2707 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,469 psi | 55% | 1601 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 33,286 psi | 70% | 2598 fps | 99.1% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 35,520 psi | 74% | 2628 fps | 95.5% |
| ReloadSwiss RS 70 | 49 gr | 90% | 38,450 psi | 80% | 2697 fps | 95.6% |
| Rottweil R 902 | <<locked>> | 80% | 40,234 psi | 84% | 2602 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 80% | 33,547 psi | 70% | 2513 fps | 97.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 38,000 psi | 79% | 2575 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 38,479 psi | 80% | 2589 fps | 99% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 34,548 psi | 72% | 2562 fps | 96.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 36,390 psi | 76% | 2474 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 34,563 psi | 72% | 2520 fps | 97.4% |
| Somchem S365 | 41.7 gr | 82% | 26,701 psi | 56% | 2398 fps | 95.6% |
| Vihtavuori N135 | <<locked>> | 80% | 39,697 psi | 83% | 2589 fps | 100% |
| Vihtavuori N140 | <<locked>> | 80% | 40,161 psi | 84% | 2592 fps | 100% |
| Vihtavuori N150 | <<locked>> | 80% | 32,750 psi | 68% | 2457 fps | 98.2% |
| Vihtavuori N160 | <<locked>> | 86% | 35,331 psi | 74% | 2562 fps | 95.6% |
| Vihtavuori N540 | <<locked>> | 80% | 38,841 psi | 81% | 2585 fps | 99.9% |
| Vihtavuori N550 | <<locked>> | 86% | 34,824 psi | 73% | 2566 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 92% | 31,096 psi | 65% | 2546 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 29,225 psi | 61% | 2379 fps | 95.3% |
| Winchester StaBALL HD | <<locked>> | 96% | 29,211 psi | 61% | 2536 fps | 95.1% |
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 46 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 140gr | Sierra SBT GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,838 fps; across all powders the maximum-charge window runs from 1,752 fps to 2,838 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 46 of the 46 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 70–90 %, 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 70 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 140gr | Sierra SBT GameKing 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.