Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 145gr | Speer Grand Slam 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% | 40,176 psi | 84% | 2644 fps | 96% |
| Accurate 4064 | <<locked>> | 82% | 41,205 psi | 86% | 2612 fps | 100% |
| Accurate 4350 | <<locked>> | 92% | 42,801 psi | 89% | 2720 fps | 98.3% |
| ADI AR 2208 | <<locked>> | 84% | 42,772 psi | 89% | 2631 fps | 98.6% |
| Alliant Power Pro 2000-MR | <<locked>> | 82% | 43,221 psi | 90% | 2772 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 42,554 psi | 89% | 2657 fps | 99.6% |
| Alliant Reloder-15 | <<locked>> | 82% | 42,670 psi | 89% | 2664 fps | 98.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,061 psi | 88% | 2723 fps | 98.4% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,061 psi | 88% | 2753 fps | 99.5% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 38,638 psi | 81% | 2680 fps | 98.9% |
| Alliant Reloder-26ᴾ | <<locked>> | 100% | 42,917 psi | 90% | 2835 fps | 98.2% |
| Bofors RP3 | <<locked>> | 84% | 42,177 psi | 88% | 2661 fps | 99.6% |
| Hodgdon H380 | <<locked>> | 84% | 43,221 psi | 90% | 2667 fps | 97.9% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 41,321 psi | 86% | 2661 fps | 99.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,520 psi | 74% | 1726 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,221 psi | 88% | 2612 fps | 98.7% |
| IMR 4831 | <<locked>> | 92% | 41,060 psi | 86% | 2667 fps | 98% |
| Lovex S062 | <<locked>> | 82% | 42,119 psi | 88% | 2615 fps | 99.7% |
| Lovex S065 | <<locked>> | 88% | 41,524 psi | 87% | 2608 fps | 96.6% |
| Norma 203B | <<locked>> | 82% | 42,047 psi | 88% | 2654 fps | 99% |
| Norma URP | <<locked>> | 92% | 42,728 psi | 89% | 2713 fps | 98.2% |
| Ramshot Big Game | <<locked>> | 82% | 41,814 psi | 87% | 2671 fps | 98.9% |
| Ramshot Hunter | <<locked>> | 92% | 41,669 psi | 87% | 2700 fps | 96.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 35,882 psi | 75% | 1765 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,119 psi | 88% | 2762 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 42,279 psi | 88% | 2736 fps | 98% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 42,583 psi | 89% | 2753 fps | 97.5% |
| Rottweil R 903 | <<locked>> | 86% | 42,351 psi | 88% | 2657 fps | 99.5% |
| Shooters World Long Rifle | <<locked>> | 88% | 41,524 psi | 87% | 2608 fps | 96.6% |
| Shooters World Precision | <<locked>> | 82% | 42,119 psi | 88% | 2615 fps | 99.7% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 40,901 psi | 85% | 2661 fps | 98.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 42,235 psi | 88% | 2539 fps | 100% |
| Somchem S355 | <<locked>> | 86% | 43,033 psi | 90% | 2657 fps | 99.4% |
| Somchem S365 | <<locked>> | 94% | 40,611 psi | 85% | 2717 fps | 99.9% |
| Vihtavuori N150 | <<locked>> | 86% | 41,191 psi | 86% | 2595 fps | 99.8% |
| Vihtavuori N160 | <<locked>> | 90% | 41,713 psi | 87% | 2657 fps | 97.9% |
| Vihtavuori N540 | <<locked>> | 82% | 42,728 psi | 89% | 2615 fps | 100% |
| Vihtavuori N550 | <<locked>> | 90% | 41,249 psi | 86% | 2664 fps | 97.6% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 42,177 psi | 88% | 2756 fps | 98.8% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 41,930 psi | 88% | 2641 fps | 99.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 34,389 psi | 72% | 2677 fps | 98.7% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 98% | 37,579 psi | 79% | 2595 fps | 95.2% |
| Accurate 4064 | <<locked>> | 80% | 38,624 psi | 81% | 2566 fps | 100% |
| Accurate 4350 | <<locked>> | 84% | 32,460 psi | 68% | 2493 fps | 95.3% |
| ADI AR 2208 | <<locked>> | 80% | 37,739 psi | 79% | 2526 fps | 97.5% |
| Alliant Power Pro 2000-MR | <<locked>> | 80% | 40,350 psi | 84% | 2710 fps | 98.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 37,536 psi | 78% | 2556 fps | 98.9% |
| Alliant Reloder-15 | <<locked>> | 80% | 40,103 psi | 84% | 2615 fps | 98.3% |
| Alliant Reloder-16 | <<locked>> | 84% | 32,866 psi | 69% | 2507 fps | 95.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,198 psi | 67% | 2520 fps | 97% |
| Alliant Reloder-23 | <<locked>> | 90% | 28,355 psi | 59% | 2408 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 94% | 34,853 psi | 73% | 2644 fps | 95.3% |
| Bofors RP3 | <<locked>> | 80% | 37,115 psi | 78% | 2559 fps | 98.9% |
| Hodgdon H380 | <<locked>> | 80% | 37,840 psi | 79% | 2559 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 82% | 28,398 psi | 59% | 2356 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,339 psi | 55% | 1539 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 39,624 psi | 83% | 2562 fps | 98.2% |
| IMR 4831 | <<locked>> | 84% | 31,517 psi | 66% | 2454 fps | 95% |
| Lovex S062 | <<locked>> | 80% | 39,595 psi | 83% | 2566 fps | 99.4% |
| Lovex S065 | <<locked>> | 84% | 36,738 psi | 77% | 2507 fps | 95.1% |
| Norma 203B | <<locked>> | 80% | 39,494 psi | 83% | 2602 fps | 98.6% |
| Norma URP | <<locked>> | 84% | 32,880 psi | 69% | 2497 fps | 95.2% |
| Ramshot Big Game | <<locked>> | 80% | 39,030 psi | 82% | 2615 fps | 98.4% |
| Ramshot Hunter | <<locked>> | 90% | 39,175 psi | 82% | 2648 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,760 psi | 56% | 1578 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,272 psi | 72% | 2585 fps | 99.6% |
| ReloadSwiss RS 62 | <<locked>> | 86% | 34,505 psi | 72% | 2566 fps | 95.6% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 37,231 psi | 78% | 2631 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 34,911 psi | 73% | 2503 fps | 98.1% |
| Shooters World Long Rifle | <<locked>> | 84% | 36,738 psi | 77% | 2507 fps | 95.1% |
| Shooters World Precision | <<locked>> | 80% | 39,595 psi | 83% | 2566 fps | 99.4% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 35,824 psi | 75% | 2552 fps | 97.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 37,362 psi | 78% | 2451 fps | 100% |
| Somchem S355 | <<locked>> | 80% | 35,621 psi | 74% | 2507 fps | 98.1% |
| Somchem S365 | <<locked>> | 80% | 25,904 psi | 54% | 2336 fps | 95.7% |
| Vihtavuori N150 | <<locked>> | 80% | 33,968 psi | 71% | 2444 fps | 98.8% |
| Vihtavuori N160 | <<locked>> | 84% | 34,432 psi | 72% | 2500 fps | 95.8% |
| Vihtavuori N540 | <<locked>> | 80% | 39,914 psi | 83% | 2562 fps | 100% |
| Vihtavuori N550 | <<locked>> | 84% | 33,794 psi | 71% | 2500 fps | 95.3% |
| Vihtavuori N555 | <<locked>> | 90% | 30,298 psi | 63% | 2484 fps | 95.1% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,023 psi | 63% | 2365 fps | 96.3% |
| Winchester StaBALL HD | <<locked>> | 94% | 28,543 psi | 60% | 2487 fps | 95.5% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 68 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 145gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,835 fps; across all powders the maximum-charge window runs from 1,726 fps to 2,835 fps. Accurate 3100 gives the best case fill at 100 %, and 68 of the 68 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 70–90 %, leaving at least 10 % headroom. The 145.0 gr projectile in 0.284" calls for a 1:13.0 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, Accurate High Country, ADI AR 2209 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.