Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 150gr | Barnes X S 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% | 42,438 psi | 89% | 2605 fps | 96.5% |
| Accurate 4350 | <<locked>> | 90% | 42,366 psi | 89% | 2625 fps | 98.2% |
| ADI AR 2208 | <<locked>> | 82% | 42,003 psi | 88% | 2533 fps | 98.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 41,945 psi | 88% | 2559 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 90% | 41,408 psi | 87% | 2625 fps | 98.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 41,234 psi | 86% | 2651 fps | 99.3% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,509 psi | 85% | 2638 fps | 99.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 41,989 psi | 88% | 2730 fps | 97.8% |
| Bofors RP3 | <<locked>> | 82% | 42,163 psi | 88% | 2572 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 82% | 42,641 psi | 89% | 2569 fps | 97.7% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 43,076 psi | 90% | 2612 fps | 99.5% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,984 psi | 75% | 1673 fps | 100% |
| IMR 4831 | <<locked>> | 92% | 43,120 psi | 90% | 2621 fps | 98.4% |
| Lovex S065 | <<locked>> | 86% | 41,437 psi | 87% | 2520 fps | 96.5% |
| Norma URP | <<locked>> | 90% | 41,785 psi | 87% | 2612 fps | 98% |
| Ramshot Hunter | <<locked>> | 90% | 40,799 psi | 85% | 2598 fps | 95.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,535 psi | 76% | 1713 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,757 psi | 89% | 2546 fps | 96.1% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 41,118 psi | 86% | 2654 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 41,655 psi | 87% | 2638 fps | 97.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,379 psi | 86% | 2641 fps | 97% |
| Rottweil R 903 | <<locked>> | 84% | 42,322 psi | 88% | 2569 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,437 psi | 87% | 2520 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 42,569 psi | 89% | 2608 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 41,626 psi | 87% | 2448 fps | 100% |
| Somchem S355 | <<locked>> | 84% | 42,714 psi | 89% | 2566 fps | 99.4% |
| Somchem S365 | <<locked>> | 94% | 42,670 psi | 89% | 2671 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 43,192 psi | 90% | 2546 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 88% | 40,959 psi | 86% | 2559 fps | 97.6% |
| Vihtavuori N550 | <<locked>> | 90% | 42,975 psi | 90% | 2615 fps | 97.9% |
| Vihtavuori N555 | <<locked>> | 98% | 41,495 psi | 87% | 2661 fps | 98.6% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 40,944 psi | 86% | 2539 fps | 99.3% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,564 psi | 76% | 2648 fps | 99.2% |
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% | 37,507 psi | 78% | 2510 fps | 95% |
| Accurate 4350 | <<locked>> | 82% | 32,837 psi | 69% | 2418 fps | 95.4% |
| ADI AR 2208 | <<locked>> | 80% | 39,436 psi | 82% | 2480 fps | 97.9% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,436 psi | 82% | 2510 fps | 99.2% |
| Alliant Reloder-16 | <<locked>> | 82% | 32,880 psi | 69% | 2418 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,360 psi | 72% | 2490 fps | 97.8% |
| Alliant Reloder-23 | <<locked>> | 88% | 28,950 psi | 60% | 2343 fps | 95.2% |
| Alliant Reloder-26 | 47.8 gr | 92% | 34,766 psi | 73% | 2556 fps | 95.1% |
| Bofors RP3 | <<locked>> | 80% | 39,639 psi | 83% | 2523 fps | 99.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,074 psi | 84% | 2520 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,790 psi | 60% | 2283 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,876 psi | 56% | 1490 fps | 100% |
| IMR 4831 | <<locked>> | 82% | 31,879 psi | 67% | 2379 fps | 95.1% |
| Lovex S065 | <<locked>> | 82% | 36,985 psi | 77% | 2425 fps | 95.1% |
| Norma URP | <<locked>> | 82% | 32,982 psi | 69% | 2415 fps | 95.2% |
| Ramshot Hunter | <<locked>> | 88% | 38,435 psi | 80% | 2546 fps | 95.1% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,427 psi | 57% | 1532 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,248 psi | 84% | 2497 fps | 95.3% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,361 psi | 76% | 2552 fps | 99.8% |
| ReloadSwiss RS 62 | 42.5 gr | 84% | 34,403 psi | 72% | 2477 fps | 95.5% |
| ReloadSwiss RS 70 | 44.3 gr | 86% | 36,680 psi | 77% | 2533 fps | 95.3% |
| Rottweil R 903 | <<locked>> | 80% | 37,304 psi | 78% | 2467 fps | 98.6% |
| Shooters World Long Rifle | <<locked>> | 82% | 36,985 psi | 77% | 2425 fps | 95.1% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,623 psi | 79% | 2507 fps | 98.1% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,305 psi | 82% | 2405 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 38,000 psi | 79% | 2470 fps | 98.6% |
| Somchem S365 | <<locked>> | 80% | 28,282 psi | 59% | 2326 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 36,027 psi | 75% | 2405 fps | 99.2% |
| Vihtavuori N160 | <<locked>> | 82% | 34,171 psi | 71% | 2411 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 82% | 33,823 psi | 71% | 2418 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 88% | 30,966 psi | 65% | 2418 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,981 psi | 67% | 2339 fps | 97% |
| Winchester StaBALL HD | <<locked>> | 92% | 28,979 psi | 61% | 2415 fps | 95.6% |
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 S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,730 fps; across all powders the maximum-charge window runs from 1,673 fps to 2,730 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 S 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.