Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 160gr | Barnes MRX BT bullet and 46 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% | 41,133 psi | 86% | 2546 fps | 97.3% |
| Accurate 4064 | <<locked>> | 82% | 41,887 psi | 88% | 2497 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 41,046 psi | 86% | 2562 fps | 98.7% |
| ADI AR 2208 | <<locked>> | 82% | 41,118 psi | 86% | 2477 fps | 99% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 40,712 psi | 85% | 2497 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 90% | 40,611 psi | 85% | 2575 fps | 98.9% |
| Alliant Reloder-17 | <<locked>> | 88% | 43,265 psi | 90% | 2648 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,407 psi | 82% | 2579 fps | 99.6% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,191 psi | 86% | 2680 fps | 98.7% |
| Bofors RP3 | <<locked>> | 84% | 43,149 psi | 90% | 2552 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 82% | 41,394 psi | 86% | 2513 fps | 98.3% |
| Hodgdon H414 | <<locked>> | 88% | 40,973 psi | 86% | 2556 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,496 psi | 89% | 2559 fps | 99.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,621 psi | 74% | 1634 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 43,192 psi | 90% | 2510 fps | 99.4% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,221 psi | 90% | 2513 fps | 96.5% |
| IMR 4831 | <<locked>> | 92% | 42,206 psi | 88% | 2566 fps | 99% |
| Lovex S062 | <<locked>> | 82% | 43,033 psi | 90% | 2507 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 42,395 psi | 89% | 2507 fps | 97.8% |
| Lovex S070 | <<locked>> | 90% | 43,018 psi | 90% | 2539 fps | 96.9% |
| Norma 203B | <<locked>> | 82% | 43,163 psi | 90% | 2549 fps | 99.7% |
| Norma MRP | <<locked>> | 98% | 41,437 psi | 87% | 2644 fps | 96.1% |
| Norma URP | <<locked>> | 90% | 41,104 psi | 86% | 2559 fps | 98.6% |
| Ramshot Big Game | <<locked>> | 82% | 42,830 psi | 89% | 2566 fps | 99.6% |
| Ramshot Hunter | <<locked>> | 92% | 42,641 psi | 89% | 2598 fps | 97.5% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,013 psi | 75% | 1673 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,655 psi | 87% | 2493 fps | 96.9% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 43,221 psi | 90% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 40,698 psi | 85% | 2582 fps | 98.5% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 40,698 psi | 85% | 2598 fps | 98% |
| Rottweil R 903 | <<locked>> | 84% | 40,466 psi | 85% | 2497 fps | 99.7% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,395 psi | 89% | 2507 fps | 97.8% |
| Shooters World Precision | <<locked>> | 82% | 43,033 psi | 90% | 2507 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 43,018 psi | 90% | 2539 fps | 96.9% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,829 psi | 87% | 2552 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,207 psi | 90% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 42,134 psi | 88% | 2461 fps | 96.4% |
| Somchem S355 | <<locked>> | 84% | 41,423 psi | 87% | 2503 fps | 99.7% |
| Somchem S365 | <<locked>> | 94% | 41,901 psi | 88% | 2612 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,134 psi | 88% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 43,120 psi | 90% | 2559 fps | 98.9% |
| Vihtavuori N550 | <<locked>> | 90% | 42,076 psi | 88% | 2559 fps | 98.6% |
| Vihtavuori N555 | <<locked>> | 98% | 40,683 psi | 85% | 2602 fps | 99.2% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,931 psi | 90% | 2539 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 40,973 psi | 86% | 2556 fps | 96.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,143 psi | 73% | 2595 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% | 35,723 psi | 75% | 2441 fps | 95.7% |
| Accurate 4064 | <<locked>> | 80% | 39,160 psi | 82% | 2451 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 30,864 psi | 64% | 2346 fps | 95.9% |
| ADI AR 2208 | <<locked>> | 80% | 38,537 psi | 81% | 2428 fps | 98.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,087 psi | 80% | 2448 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 80% | 29,486 psi | 62% | 2306 fps | 95.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,822 psi | 69% | 2425 fps | 98.3% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,093 psi | 57% | 2274 fps | 95.7% |
| Alliant Reloder-26 | 49.2 gr | 92% | 33,286 psi | 70% | 2500 fps | 96.1% |
| Bofors RP3 | <<locked>> | 80% | 37,666 psi | 79% | 2451 fps | 99.5% |
| Hodgdon H380 | <<locked>> | 80% | 38,450 psi | 80% | 2454 fps | 97.6% |
| Hodgdon H414 | <<locked>> | 86% | 38,334 psi | 80% | 2503 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,021 psi | 56% | 2215 fps | 96% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,382 psi | 55% | 1457 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,422 psi | 84% | 2457 fps | 99% |
| IMR 4451 Enduron | <<locked>> | 82% | 38,043 psi | 79% | 2411 fps | 95% |
| IMR 4831 | <<locked>> | 82% | 30,052 psi | 63% | 2306 fps | 95.5% |
| Lovex S062 | <<locked>> | 80% | 40,292 psi | 84% | 2457 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,172 psi | 73% | 2359 fps | 95.7% |
| Lovex S070 | <<locked>> | 86% | 37,811 psi | 79% | 2434 fps | 95.4% |
| Norma 203B | <<locked>> | 80% | 40,437 psi | 84% | 2497 fps | 99.3% |
| Norma MRP | <<locked>> | 96% | 38,551 psi | 81% | 2582 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 31,357 psi | 66% | 2346 fps | 95.8% |
| Ramshot Big Game | <<locked>> | 80% | 40,074 psi | 84% | 2513 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 86% | 35,157 psi | 73% | 2441 fps | 95.2% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,803 psi | 56% | 1496 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,102 psi | 82% | 2444 fps | 96.2% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,983 psi | 73% | 2487 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 30,676 psi | 64% | 2359 fps | 95.3% |
| ReloadSwiss RS 70 | 44.5 gr | 84% | 33,141 psi | 69% | 2421 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 35,331 psi | 74% | 2395 fps | 99% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,172 psi | 73% | 2359 fps | 95.7% |
| Shooters World Precision | <<locked>> | 80% | 40,292 psi | 84% | 2457 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 37,811 psi | 79% | 2434 fps | 95.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,608 psi | 76% | 2451 fps | 98.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,014 psi | 79% | 2343 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,378 psi | 82% | 2408 fps | 95.6% |
| Somchem S355 | <<locked>> | 80% | 36,260 psi | 76% | 2405 fps | 99% |
| Somchem S365 | 39.6 gr | 80% | 26,266 psi | 55% | 2251 fps | 97.2% |
| Vihtavuori N150 | <<locked>> | 80% | 34,447 psi | 72% | 2339 fps | 99.4% |
| Vihtavuori N160 | <<locked>> | 80% | 30,748 psi | 64% | 2300 fps | 95.5% |
| Vihtavuori N550 | <<locked>> | 82% | 32,358 psi | 68% | 2352 fps | 95.9% |
| Vihtavuori N555 | <<locked>> | 88% | 29,022 psi | 61% | 2343 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,530 psi | 64% | 2277 fps | 97.6% |
| Winchester 760 | <<locked>> | 86% | 38,334 psi | 80% | 2503 fps | 95.4% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,021 psi | 56% | 2346 fps | 96.3% |
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 | 160gr | Barnes MRX BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,680 fps; across all powders the maximum-charge window runs from 1,634 fps to 2,680 fps. Accurate 3100 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 73–90 %, leaving at least 10 % headroom. The 160.0 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. Alliant Reloder-26, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 160gr | Barnes MRX BT 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.