Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 145gr | Speer Boat-Tail bullet and 41 powders. The key underlying parameters are shown in the table above.
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% | 40,030 psi | 84% | 2641 fps | 95.9% |
| Accurate 4064 | <<locked>> | 82% | 41,191 psi | 86% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,583 psi | 89% | 2713 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 84% | 42,525 psi | 89% | 2625 fps | 98.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,018 psi | 90% | 2766 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,351 psi | 88% | 2651 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,743 psi | 89% | 2664 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 41,858 psi | 87% | 2720 fps | 98.3% |
| Alliant Reloder-17 | <<locked>> | 88% | 41,872 psi | 87% | 2746 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,261 psi | 80% | 2671 fps | 98.8% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,772 psi | 89% | 2831 fps | 98.1% |
| Bofors RP3 | <<locked>> | 84% | 42,250 psi | 88% | 2661 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 42,975 psi | 90% | 2664 fps | 97.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,118 psi | 86% | 2657 fps | 99.2% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,433 psi | 74% | 1722 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 41,974 psi | 88% | 2608 fps | 98.7% |
| IMR 4831 | <<locked>> | 92% | 40,857 psi | 85% | 2664 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 41,901 psi | 88% | 2612 fps | 99.7% |
| Lovex S065 | <<locked>> | 88% | 41,568 psi | 87% | 2608 fps | 96.6% |
| Norma 203B | <<locked>> | 82% | 42,061 psi | 88% | 2654 fps | 99% |
| Norma URP | <<locked>> | 92% | 42,511 psi | 89% | 2710 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 82% | 41,611 psi | 87% | 2667 fps | 98.8% |
| Ramshot Hunter | <<locked>> | 92% | 41,452 psi | 87% | 2694 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,810 psi | 75% | 1762 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 41,916 psi | 88% | 2756 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,090 psi | 88% | 2730 fps | 97.9% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,177 psi | 88% | 2743 fps | 97.4% |
| Rottweil R 903 | <<locked>> | 86% | 42,119 psi | 88% | 2651 fps | 99.4% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,568 psi | 87% | 2608 fps | 96.6% |
| Shooters World Precision | <<locked>> | 82% | 41,901 psi | 88% | 2612 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 86% | 43,308 psi | 90% | 2707 fps | 99.2% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,279 psi | 88% | 2539 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,062 psi | 90% | 2657 fps | 99.4% |
| Somchem S365 | <<locked>> | 96% | 43,076 psi | 90% | 2762 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 40,959 psi | 86% | 2589 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 90% | 41,727 psi | 87% | 2654 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 42,511 psi | 89% | 2612 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 41,046 psi | 86% | 2661 fps | 97.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 41,916 psi | 88% | 2749 fps | 98.7% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,510 psi | 87% | 2631 fps | 99.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,287 psi | 72% | 2671 fps | 98.6% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 37,144 psi | 78% | 2582 fps | 95% |
| Accurate 4064 | <<locked>> | 80% | 38,653 psi | 81% | 2562 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,256 psi | 67% | 2490 fps | 95.2% |
| ADI AR 2208 | <<locked>> | 80% | 37,521 psi | 78% | 2523 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,132 psi | 84% | 2703 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,289 psi | 78% | 2549 fps | 98.8% |
| Alliant Reloder-15 | <<locked>> | 80% | 39,900 psi | 83% | 2608 fps | 98.2% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,880 psi | 69% | 2503 fps | 95.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,053 psi | 67% | 2513 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 92% | 30,168 psi | 63% | 2461 fps | 95.9% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,693 psi | 72% | 2638 fps | 95.2% |
| Bofors RP3 | <<locked>> | 80% | 36,869 psi | 77% | 2552 fps | 98.8% |
| Hodgdon H380 | <<locked>> | 80% | 37,608 psi | 79% | 2552 fps | 96.4% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,239 psi | 59% | 2349 fps | 95.3% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,484 psi | 55% | 1542 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,392 psi | 82% | 2556 fps | 98.1% |
| IMR 4831 | <<locked>> | 86% | 33,446 psi | 70% | 2500 fps | 95.7% |
| Lovex S062 | <<locked>> | 80% | 39,349 psi | 82% | 2562 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 36,796 psi | 77% | 2507 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 39,247 psi | 82% | 2598 fps | 98.5% |
| Norma URP | <<locked>> | 84% | 32,706 psi | 68% | 2493 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 38,827 psi | 81% | 2612 fps | 98.3% |
| Ramshot Hunter | <<locked>> | 90% | 38,769 psi | 81% | 2638 fps | 95.3% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,658 psi | 56% | 1575 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,098 psi | 71% | 2579 fps | 99.5% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,316 psi | 72% | 2559 fps | 95.5% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,028 psi | 77% | 2628 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 34,664 psi | 72% | 2497 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,796 psi | 77% | 2507 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 39,349 psi | 82% | 2562 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,650 psi | 74% | 2546 fps | 97.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,130 psi | 78% | 2448 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,621 psi | 74% | 2507 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 25,730 psi | 54% | 2333 fps | 95.6% |
| Vihtavuori N150 | <<locked>> | 80% | 33,750 psi | 71% | 2441 fps | 98.7% |
| Vihtavuori N160 | <<locked>> | 84% | 34,243 psi | 72% | 2497 fps | 95.7% |
| Vihtavuori N540 | <<locked>> | 80% | 39,697 psi | 83% | 2559 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,591 psi | 70% | 2493 fps | 95.2% |
| Vihtavuori N555 | <<locked>> | 90% | 30,284 psi | 63% | 2484 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,052 psi | 63% | 2365 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,413 psi | 59% | 2480 fps | 95.4% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 67 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 145gr | Speer Boat-Tail. Alliant Reloder-26 delivers the highest muzzle velocity at 2,831 fps; across all powders the maximum-charge window runs from 1,722 fps to 2,831 fps. Accurate 3100 gives the best case fill at 100 %, and 67 of the 67 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 69–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-22, Alliant Reloder-23 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. As outliers, Accurate 2700, ADI AR 2209, Alliant Reloder-19 burn incompletely and react more sensitively to barrel length and temperature. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.