Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 150gr | Sierra MatchKing bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100ᴾ | <<locked>> | 100% | 40,422 psi | 84% | 2605 fps | 96.3% |
| Accurate 4064 | <<locked>> | 82% | 41,626 psi | 87% | 2569 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 43,047 psi | 90% | 2674 fps | 98.6% |
| ADI AR 2208 | <<locked>> | 84% | 42,960 psi | 90% | 2585 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,801 psi | 89% | 2612 fps | 99.7% |
| Alliant Reloder-15 | <<locked>> | 82% | 43,178 psi | 90% | 2625 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,453 psi | 89% | 2684 fps | 98.7% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,293 psi | 88% | 2707 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,754 psi | 81% | 2638 fps | 99.1% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 43,308 psi | 90% | 2795 fps | 98.5% |
| Bofors RP3 | <<locked>> | 84% | 42,496 psi | 89% | 2618 fps | 99.7% |
| Hodgdon H380 | <<locked>> | 82% | 40,799 psi | 85% | 2572 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 90% | 43,018 psi | 90% | 2671 fps | 96% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,814 psi | 87% | 2625 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,447 psi | 74% | 1686 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,598 psi | 89% | 2572 fps | 98.9% |
| IMR 4831 | <<locked>> | 92% | 41,321 psi | 86% | 2625 fps | 98.3% |
| Lovex S062 | <<locked>> | 82% | 42,525 psi | 89% | 2575 fps | 99.8% |
| Lovex S065 | <<locked>> | 88% | 41,800 psi | 87% | 2569 fps | 97% |
| Lovex S070 | <<locked>> | 90% | 42,308 psi | 88% | 2595 fps | 95.9% |
| Norma 203B | <<locked>> | 82% | 42,496 psi | 89% | 2615 fps | 99.3% |
| Norma URP | <<locked>> | 92% | 42,960 psi | 90% | 2671 fps | 98.5% |
| Ramshot Big Game | <<locked>> | 82% | 42,177 psi | 88% | 2631 fps | 99.1% |
| Ramshot Hunter | <<locked>> | 92% | 41,930 psi | 88% | 2657 fps | 96.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,853 psi | 75% | 1726 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,060 psi | 86% | 2552 fps | 96% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,293 psi | 88% | 2713 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,641 psi | 89% | 2694 fps | 98.3% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,714 psi | 89% | 2710 fps | 97.8% |
| Rottweil R 903 | <<locked>> | 86% | 42,685 psi | 89% | 2615 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,800 psi | 87% | 2569 fps | 97% |
| Shooters World Precision | <<locked>> | 82% | 42,525 psi | 89% | 2575 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 90% | 42,308 psi | 88% | 2595 fps | 95.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 40,973 psi | 86% | 2612 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,627 psi | 89% | 2497 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,308 psi | 90% | 2615 fps | 99.6% |
| Somchem S365 | <<locked>> | 94% | 40,886 psi | 85% | 2674 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 41,437 psi | 87% | 2549 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 90% | 42,163 psi | 88% | 2618 fps | 98.2% |
| Vihtavuori N540 | <<locked>> | 82% | 42,975 psi | 90% | 2569 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 41,510 psi | 87% | 2621 fps | 97.9% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,351 psi | 88% | 2710 fps | 99% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,003 psi | 88% | 2595 fps | 99.6% |
| Winchester 760 | <<locked>> | 90% | 43,018 psi | 90% | 2671 fps | 96% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,621 psi | 72% | 2641 fps | 99% |
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 3100 | <<locked>> | 98% | 37,724 psi | 79% | 2552 fps | 95.5% |
| Accurate 4064 | <<locked>> | 80% | 38,986 psi | 81% | 2523 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,721 psi | 68% | 2457 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 38,029 psi | 79% | 2487 fps | 97.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,637 psi | 79% | 2510 fps | 99% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,509 psi | 85% | 2572 fps | 98.5% |
| Alliant Reloder-16 | 41.1 gr | 84% | 33,214 psi | 69% | 2470 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,401 psi | 68% | 2480 fps | 97.4% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,631 psi | 60% | 2375 fps | 95.5% |
| Alliant Reloder-26 | 50.7 gr | 94% | 35,027 psi | 73% | 2605 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 37,260 psi | 78% | 2513 fps | 99.1% |
| Hodgdon H380 | <<locked>> | 80% | 38,000 psi | 79% | 2513 fps | 96.8% |
| Hodgdon H414 | <<locked>> | 88% | 40,103 psi | 84% | 2612 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,485 psi | 60% | 2316 fps | 95.8% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,353 psi | 55% | 1506 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,943 psi | 83% | 2520 fps | 98.5% |
| IMR 4831 | <<locked>> | 84% | 31,778 psi | 66% | 2415 fps | 95.4% |
| Lovex S062 | <<locked>> | 80% | 39,929 psi | 83% | 2526 fps | 99.6% |
| Lovex S065 | <<locked>> | 84% | 37,173 psi | 78% | 2470 fps | 95.6% |
| Lovex S070 | <<locked>> | 88% | 39,769 psi | 83% | 2546 fps | 95.2% |
| Norma 203B | <<locked>> | 80% | 39,900 psi | 83% | 2562 fps | 98.9% |
| Norma URP | <<locked>> | 84% | 33,069 psi | 69% | 2457 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,334 psi | 82% | 2575 fps | 98.6% |
| Ramshot Hunter | <<locked>> | 90% | 39,392 psi | 82% | 2605 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,789 psi | 56% | 1545 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 38,551 psi | 81% | 2500 fps | 95.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,490 psi | 72% | 2546 fps | 99.7% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,503 psi | 68% | 2470 fps | 95.2% |
| ReloadSwiss RS 70 | <<locked>> | 86% | 34,998 psi | 73% | 2533 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 35,027 psi | 73% | 2461 fps | 98.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 37,173 psi | 78% | 2470 fps | 95.6% |
| Shooters World Precision | <<locked>> | 80% | 39,929 psi | 83% | 2526 fps | 99.6% |
| Shooters World SW4350 | <<locked>> | 88% | 39,769 psi | 83% | 2546 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,056 psi | 75% | 2510 fps | 97.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,623 psi | 79% | 2408 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,955 psi | 75% | 2467 fps | 98.4% |
| Somchem S365 | 39.9 gr | 80% | 26,005 psi | 54% | 2303 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 80% | 34,098 psi | 71% | 2402 fps | 99% |
| Vihtavuori N160 | <<locked>> | 82% | 32,474 psi | 68% | 2408 fps | 95.3% |
| Vihtavuori N540 | <<locked>> | 80% | 40,089 psi | 84% | 2520 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 34,040 psi | 71% | 2464 fps | 95.7% |
| Vihtavuori N555 | <<locked>> | 90% | 30,618 psi | 64% | 2451 fps | 95.7% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,255 psi | 63% | 2333 fps | 96.7% |
| Winchester 760 | <<locked>> | 88% | 40,321 psi | 84% | 2618 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,631 psi | 60% | 2451 fps | 96.1% |
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 45 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 150gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,795 fps; across all powders the maximum-charge window runs from 1,686 fps to 2,795 fps. Accurate 3100 gives the best case fill at 100 %, and 45 of the 45 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 72–90 %, leaving at least 10 % headroom. The 150.0 gr projectile in 0.284" calls for a 1:11.5 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, Alliant Reloder-26 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-26, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 150gr | Sierra MatchKing 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.