Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 160gr | Sierra GameKing bullet and 41 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Somchem S365 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 3100ᴾ | <<locked>> | 100% | 41,843 psi | 87% | 2546 fps | 97.3% |
| Accurate 4064 | <<locked>> | 82% | 42,728 psi | 89% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 41,510 psi | 87% | 2559 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 41,423 psi | 87% | 2470 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 41,133 psi | 86% | 2493 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 40,828 psi | 85% | 2566 fps | 98.8% |
| Alliant Reloder-17 | <<locked>> | 86% | 40,799 psi | 85% | 2589 fps | 99.7% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,856 psi | 83% | 2575 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,568 psi | 87% | 2674 fps | 98.6% |
| Bofors RP3 | <<locked>> | 82% | 40,944 psi | 86% | 2500 fps | 99.8% |
| Hodgdon H380 | <<locked>> | 82% | 41,945 psi | 88% | 2507 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 88% | 41,234 psi | 86% | 2549 fps | 96.1% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,757 psi | 89% | 2552 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,723 psi | 75% | 1627 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 42,554 psi | 89% | 2559 fps | 98.9% |
| Lovex S065 | <<locked>> | 88% | 43,004 psi | 90% | 2503 fps | 97.8% |
| Lovex S070 | <<locked>> | 88% | 40,712 psi | 85% | 2480 fps | 96.1% |
| Norma MRP | <<locked>> | 98% | 41,727 psi | 87% | 2635 fps | 96% |
| Norma URP | <<locked>> | 90% | 41,365 psi | 86% | 2552 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 43,265 psi | 90% | 2559 fps | 99.5% |
| Ramshot Hunter | <<locked>> | 92% | 42,960 psi | 90% | 2592 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,172 psi | 76% | 1667 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,163 psi | 88% | 2487 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 40,712 psi | 85% | 2592 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,133 psi | 86% | 2575 fps | 98.4% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,089 psi | 86% | 2592 fps | 98% |
| Rottweil R 903 | <<locked>> | 84% | 41,133 psi | 86% | 2497 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,004 psi | 90% | 2503 fps | 97.8% |
| Shooters World SW4350 | <<locked>> | 88% | 40,712 psi | 85% | 2480 fps | 96.1% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,264 psi | 88% | 2549 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 40,959 psi | 86% | 2382 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,424 psi | 89% | 2451 fps | 96.3% |
| Somchem S355 | <<locked>> | 84% | 41,945 psi | 88% | 2500 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 42,235 psi | 88% | 2608 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,641 psi | 89% | 2484 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 40,538 psi | 85% | 2500 fps | 98.3% |
| Vihtavuori N550 | <<locked>> | 90% | 42,438 psi | 89% | 2552 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 98% | 41,205 psi | 86% | 2598 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,989 psi | 90% | 2526 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 41,481 psi | 87% | 2556 fps | 96.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,766 psi | 75% | 2592 fps | 99.7% |
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 3100 | <<locked>> | 96% | 36,390 psi | 76% | 2444 fps | 95.8% |
| Accurate 4064 | <<locked>> | 80% | 40,219 psi | 84% | 2454 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 29,385 psi | 61% | 2293 fps | 95% |
| ADI AR 2208 | <<locked>> | 80% | 39,044 psi | 82% | 2425 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,769 psi | 81% | 2448 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,124 psi | 63% | 2310 fps | 95.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 33,330 psi | 70% | 2425 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,746 psi | 58% | 2277 fps | 95.9% |
| Alliant Reloder-26 | 47.3 gr | 90% | 31,589 psi | 66% | 2438 fps | 95% |
| Bofors RP3 | <<locked>> | 80% | 38,290 psi | 80% | 2448 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 39,262 psi | 82% | 2457 fps | 97.7% |
| Hodgdon H414 | <<locked>> | 86% | 38,624 psi | 81% | 2497 fps | 95.3% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,499 psi | 57% | 2215 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,629 psi | 56% | 1453 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 30,632 psi | 64% | 2306 fps | 95.6% |
| Lovex S065 | <<locked>> | 80% | 33,721 psi | 70% | 2313 fps | 95% |
| Lovex S070 | <<locked>> | 86% | 38,392 psi | 80% | 2434 fps | 95.4% |
| Norma MRP | <<locked>> | 96% | 39,102 psi | 82% | 2579 fps | 95.1% |
| Norma URP | <<locked>> | 80% | 29,994 psi | 63% | 2300 fps | 95% |
| Ramshot Big Game | <<locked>> | 80% | 40,509 psi | 85% | 2510 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 35,491 psi | 74% | 2438 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 56% | 1486 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,537 psi | 83% | 2438 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 35,476 psi | 74% | 2484 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 31,299 psi | 65% | 2362 fps | 95.4% |
| ReloadSwiss RS 70 | 43.7 gr | 84% | 33,504 psi | 70% | 2415 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 36,172 psi | 76% | 2398 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 80% | 33,721 psi | 70% | 2313 fps | 95% |
| Shooters World SW4350 | <<locked>> | 86% | 38,392 psi | 80% | 2434 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,057 psi | 77% | 2448 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,551 psi | 81% | 2339 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,697 psi | 83% | 2402 fps | 95.5% |
| Somchem S355 | <<locked>> | 80% | 37,014 psi | 77% | 2405 fps | 99% |
| Somchem S365 | 38.9 gr | 80% | 26,876 psi | 56% | 2254 fps | 97.3% |
| Vihtavuori N150 | <<locked>> | 80% | 35,157 psi | 73% | 2343 fps | 99.5% |
| Vihtavuori N160 | <<locked>> | 80% | 31,256 psi | 65% | 2300 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 80% | 30,821 psi | 64% | 2303 fps | 95.1% |
| Vihtavuori N555 | <<locked>> | 86% | 27,804 psi | 58% | 2293 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,082 psi | 65% | 2277 fps | 97.7% |
| Winchester 760 | <<locked>> | 86% | 38,856 psi | 81% | 2500 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 90% | 25,976 psi | 54% | 2290 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 41 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 160gr | Sierra GameKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,627 fps to 2,674 fps. Accurate 3100 gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 75–90 %, leaving at least 10 % headroom. The 160.0 gr projectile in 0.284" calls for a 1:11.0 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. Alliant Reloder-26, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 160gr | Sierra 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.