Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 150gr | Sierra GameKing bullet and 44 powders. The key underlying parameters are shown in the table above.
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 3100ᴾ | <<locked>> | 100% | 40,712 psi | 85% | 2612 fps | 96.5% |
| Accurate 4064 | <<locked>> | 82% | 41,800 psi | 87% | 2575 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 40,611 psi | 85% | 2631 fps | 98.1% |
| ADI AR 2208 | <<locked>> | 82% | 40,683 psi | 85% | 2543 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,917 psi | 90% | 2615 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,308 psi | 90% | 2631 fps | 99.1% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,830 psi | 89% | 2694 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,656 psi | 89% | 2717 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,073 psi | 82% | 2644 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,611 psi | 85% | 2743 fps | 97.9% |
| Bofors RP3 | <<locked>> | 84% | 42,917 psi | 90% | 2628 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 40,930 psi | 86% | 2579 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 90% | 43,091 psi | 90% | 2674 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,887 psi | 88% | 2628 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 74% | 1690 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,714 psi | 89% | 2575 fps | 99% |
| IMR 4831 | <<locked>> | 92% | 41,684 psi | 87% | 2635 fps | 98.4% |
| Lovex S062 | <<locked>> | 82% | 42,699 psi | 89% | 2582 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 42,206 psi | 88% | 2579 fps | 97.1% |
| Lovex S070 | <<locked>> | 90% | 42,699 psi | 89% | 2605 fps | 96.1% |
| Norma 203B | <<locked>> | 82% | 42,656 psi | 89% | 2618 fps | 99.3% |
| Norma URP | <<locked>> | 90% | 40,582 psi | 85% | 2625 fps | 98% |
| Ramshot Big Game | <<locked>> | 82% | 42,293 psi | 88% | 2635 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 92% | 42,250 psi | 88% | 2667 fps | 96.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 75% | 1729 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,408 psi | 87% | 2562 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,656 psi | 89% | 2723 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,033 psi | 90% | 2703 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,975 psi | 90% | 2717 fps | 97.9% |
| Rottweil R 903 | <<locked>> | 86% | 43,091 psi | 90% | 2625 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,206 psi | 88% | 2579 fps | 97.1% |
| Shooters World Precision | <<locked>> | 82% | 42,699 psi | 89% | 2582 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 42,699 psi | 89% | 2605 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,350 psi | 86% | 2621 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,757 psi | 89% | 2503 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 40,988 psi | 86% | 2575 fps | 99.3% |
| Somchem S365 | <<locked>> | 94% | 41,220 psi | 86% | 2680 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 41,872 psi | 87% | 2559 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 42,496 psi | 89% | 2625 fps | 98.3% |
| Vihtavuori N540 | <<locked>> | 82% | 43,105 psi | 90% | 2572 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 41,582 psi | 87% | 2625 fps | 98% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,685 psi | 89% | 2717 fps | 99.1% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,279 psi | 88% | 2602 fps | 99.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,838 psi | 73% | 2651 fps | 99.2% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 38,058 psi | 80% | 2559 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,175 psi | 82% | 2526 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,851 psi | 69% | 2461 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,174 psi | 80% | 2493 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,768 psi | 79% | 2516 fps | 99.1% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,654 psi | 85% | 2579 fps | 98.6% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,285 psi | 65% | 2421 fps | 95% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,706 psi | 68% | 2490 fps | 97.6% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,877 psi | 60% | 2385 fps | 95.7% |
| Alliant Reloder-26 | <<locked>> | 94% | 35,288 psi | 74% | 2615 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 37,420 psi | 78% | 2520 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,392 psi | 80% | 2526 fps | 97% |
| Hodgdon H414 | <<locked>> | 88% | 40,466 psi | 85% | 2621 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,006 psi | 56% | 2274 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,426 psi | 55% | 1509 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,089 psi | 84% | 2526 fps | 98.5% |
| IMR 4831 | <<locked>> | 84% | 31,908 psi | 67% | 2421 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 40,089 psi | 84% | 2530 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,246 psi | 78% | 2477 fps | 95.7% |
| Lovex S070 | <<locked>> | 88% | 40,103 psi | 84% | 2556 fps | 95.3% |
| Norma 203B | <<locked>> | 80% | 40,016 psi | 84% | 2566 fps | 98.9% |
| Norma URP | <<locked>> | 82% | 31,343 psi | 65% | 2415 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 39,465 psi | 82% | 2579 fps | 98.7% |
| Ramshot Hunter | <<locked>> | 88% | 37,101 psi | 78% | 2556 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,876 psi | 56% | 1549 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,682 psi | 81% | 2507 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,809 psi | 73% | 2556 fps | 99.8% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,793 psi | 69% | 2480 fps | 95.3% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 35,230 psi | 74% | 2539 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,389 psi | 74% | 2470 fps | 98.5% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,246 psi | 78% | 2477 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 40,089 psi | 84% | 2530 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 40,103 psi | 84% | 2556 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,201 psi | 76% | 2513 fps | 98% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,782 psi | 79% | 2415 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 36,100 psi | 75% | 2470 fps | 98.5% |
| Somchem S365 | <<locked>> | 80% | 26,266 psi | 55% | 2313 fps | 96.3% |
| Vihtavuori N150 | <<locked>> | 80% | 34,461 psi | 72% | 2411 fps | 99.1% |
| Vihtavuori N160 | <<locked>> | 82% | 32,605 psi | 68% | 2411 fps | 95.4% |
| Vihtavuori N540 | <<locked>> | 80% | 40,466 psi | 85% | 2526 fps | 100% |
| Vihtavuori N550 | <<locked>> | 82% | 32,039 psi | 67% | 2415 fps | 95% |
| Vihtavuori N555 | <<locked>> | 90% | 30,922 psi | 65% | 2461 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,501 psi | 64% | 2339 fps | 96.8% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,151 psi | 57% | 2402 fps | 95% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 44 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 150gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,743 fps; across all powders the maximum-charge window runs from 1,690 fps to 2,743 fps. Accurate 3100 gives the best case fill at 100 %, and 44 of the 44 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 150.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.