Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 150gr | Barnes X BT bullet and 33 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, ReloadSwiss RS 70 and ReloadSwiss RS 62.
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% | 42,656 psi | 89% | 2612 fps | 96.6% |
| Accurate 4350 | <<locked>> | 90% | 42,554 psi | 89% | 2628 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 41,901 psi | 88% | 2530 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 41,901 psi | 88% | 2559 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 41,292 psi | 86% | 2625 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 41,379 psi | 86% | 2654 fps | 99.4% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,393 psi | 84% | 2635 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,148 psi | 88% | 2733 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 42,105 psi | 88% | 2572 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 82% | 42,859 psi | 90% | 2575 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 43,236 psi | 90% | 2615 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,926 psi | 75% | 1670 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 43,018 psi | 90% | 2621 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 41,307 psi | 86% | 2520 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 41,916 psi | 88% | 2615 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 40,988 psi | 86% | 2602 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,463 psi | 76% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,873 psi | 90% | 2549 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 40,988 psi | 86% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,553 psi | 87% | 2638 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,510 psi | 87% | 2644 fps | 97.1% |
| Rottweil R 903 | <<locked>> | 84% | 42,264 psi | 88% | 2569 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,307 psi | 86% | 2520 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,743 psi | 89% | 2612 fps | 99.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 41,510 psi | 87% | 2444 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 42,873 psi | 90% | 2569 fps | 99.4% |
| Somchem S365 | <<locked>> | 94% | 42,873 psi | 90% | 2677 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 40,756 psi | 85% | 2500 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 88% | 41,089 psi | 86% | 2562 fps | 97.7% |
| Vihtavuori N550 | <<locked>> | 90% | 43,134 psi | 90% | 2618 fps | 98% |
| Vihtavuori N555 | <<locked>> | 98% | 41,655 psi | 87% | 2664 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 40,814 psi | 85% | 2536 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,709 psi | 77% | 2654 fps | 99.3% |
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% | 37,666 psi | 79% | 2513 fps | 95.1% |
| Accurate 4350 | <<locked>> | 82% | 32,996 psi | 69% | 2425 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,653 psi | 83% | 2487 fps | 98% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,595 psi | 83% | 2513 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,996 psi | 69% | 2425 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,243 psi | 72% | 2490 fps | 97.7% |
| Alliant Reloder-23 | <<locked>> | 88% | 29,051 psi | 61% | 2346 fps | 95.3% |
| Alliant Reloder-26 | 47.9 gr | 92% | 34,911 psi | 73% | 2562 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 39,552 psi | 83% | 2523 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,219 psi | 84% | 2523 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,921 psi | 60% | 2287 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,832 psi | 56% | 1490 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 31,836 psi | 67% | 2379 fps | 95.1% |
| Lovex S065 | <<locked>> | 82% | 36,869 psi | 77% | 2425 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 33,112 psi | 69% | 2418 fps | 95.3% |
| Ramshot Hunter | <<locked>> | 88% | 38,609 psi | 81% | 2549 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,383 psi | 57% | 1532 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,379 psi | 84% | 2500 fps | 95.4% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,289 psi | 76% | 2549 fps | 99.8% |
| ReloadSwiss RS 62 | 42.6 gr | 84% | 34,519 psi | 72% | 2480 fps | 95.6% |
| ReloadSwiss RS 70 | 44.3 gr | 86% | 36,593 psi | 76% | 2533 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 37,463 psi | 78% | 2474 fps | 98.7% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,869 psi | 77% | 2425 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,753 psi | 79% | 2513 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,204 psi | 82% | 2405 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,116 psi | 80% | 2474 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 28,195 psi | 59% | 2326 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 36,172 psi | 76% | 2411 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 34,330 psi | 72% | 2415 fps | 95.7% |
| Vihtavuori N550 | <<locked>> | 82% | 33,953 psi | 71% | 2421 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 31,096 psi | 65% | 2421 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,140 psi | 67% | 2343 fps | 97.1% |
| Winchester StaBALL HD | <<locked>> | 92% | 29,109 psi | 61% | 2421 fps | 95.7% |
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 33 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 150gr | Barnes X BT. Alliant Reloder-26 delivers the highest muzzle velocity at 2,733 fps; across all powders the maximum-charge window runs from 1,670 fps to 2,733 fps. Accurate 3100 gives the best case fill at 100 %, and 33 of the 33 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 150.0 gr projectile in 0.284" calls for a 1:10.5 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, ReloadSwiss RS 70, ReloadSwiss RS 62 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 150gr | Barnes X 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.