Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 160gr | Speer Grand Slam bullet and 45 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Alliant Reloder-16 and Somchem S365.
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 3100 | <<locked>> | 98% | 40,712 psi | 85% | 2536 fps | 97.2% |
| Accurate 4350 | <<locked>> | 90% | 43,236 psi | 90% | 2598 fps | 99.1% |
| ADI AR 2208 | <<locked>> | 82% | 42,554 psi | 89% | 2503 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,366 psi | 89% | 2523 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,279 psi | 88% | 2605 fps | 99.2% |
| Alliant Reloder-17 | <<locked>> | 86% | 42,279 psi | 88% | 2628 fps | 99.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,394 psi | 86% | 2615 fps | 99.8% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,434 psi | 76% | 2520 fps | 96.4% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,250 psi | 90% | 2720 fps | 99.1% |
| Bofors RP3 | <<locked>> | 82% | 42,453 psi | 89% | 2536 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 42,888 psi | 90% | 2507 fps | 96% |
| Hodgdon H380 | <<locked>> | 82% | 43,033 psi | 90% | 2539 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 88% | 42,786 psi | 89% | 2589 fps | 96.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 41,510 psi | 87% | 2539 fps | 99.8% |
| Hodgdon Superformance | <<locked>> | 88% | 42,380 psi | 89% | 2608 fps | 96.1% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,839 psi | 75% | 1640 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 43,207 psi | 90% | 2536 fps | 96.1% |
| IMR 4451 Enduron | <<locked>> | 84% | 41,887 psi | 88% | 2487 fps | 96.2% |
| IMR 4831 | <<locked>> | 90% | 41,408 psi | 87% | 2549 fps | 98.9% |
| Lovex S065 | <<locked>> | 86% | 41,611 psi | 87% | 2490 fps | 97.6% |
| Lovex S070 | <<locked>> | 88% | 42,221 psi | 88% | 2520 fps | 96.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,274 psi | 76% | 2448 fps | 96% |
| Norma MRP | <<locked>> | 98% | 43,134 psi | 90% | 2677 fps | 96.7% |
| Norma URP | <<locked>> | 90% | 43,004 psi | 90% | 2592 fps | 99% |
| Ramshot Hunter | <<locked>> | 90% | 41,698 psi | 87% | 2579 fps | 97.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,289 psi | 76% | 1680 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 41,959 psi | 88% | 2625 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,685 psi | 89% | 2615 fps | 98.8% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,337 psi | 88% | 2631 fps | 98.5% |
| Rottweil R 903 | <<locked>> | 84% | 42,612 psi | 89% | 2533 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 86% | 42,888 psi | 90% | 2507 fps | 96% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,611 psi | 87% | 2490 fps | 97.6% |
| Shooters World SW4350 | <<locked>> | 88% | 42,221 psi | 88% | 2520 fps | 96.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 40,944 psi | 86% | 2533 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,177 psi | 88% | 2411 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 40,944 psi | 86% | 2434 fps | 96.1% |
| Somchem S355 | <<locked>> | 84% | 43,134 psi | 90% | 2533 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 41,046 psi | 86% | 2595 fps | 100% |
| Vihtavuori N150 | <<locked>> | 84% | 41,278 psi | 86% | 2467 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 41,872 psi | 87% | 2536 fps | 98.7% |
| Vihtavuori N550 | <<locked>> | 88% | 41,263 psi | 86% | 2539 fps | 98.5% |
| Vihtavuori N555 | <<locked>> | 98% | 42,786 psi | 89% | 2638 fps | 99.5% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 41,582 psi | 87% | 2513 fps | 99.8% |
| Winchester 760 | <<locked>> | 88% | 43,033 psi | 90% | 2595 fps | 96.9% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,985 psi | 77% | 2638 fps | 99.9% |
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>> | 94% | 35,563 psi | 74% | 2434 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 30,560 psi | 64% | 2329 fps | 95.8% |
| ADI AR 2208 | <<locked>> | 80% | 39,943 psi | 83% | 2454 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,001 psi | 84% | 2480 fps | 99.7% |
| Alliant Reloder-16 | 39.3 gr | 80% | 31,053 psi | 65% | 2346 fps | 95.9% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,461 psi | 72% | 2464 fps | 98.8% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,934 psi | 56% | 2264 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,287 psi | 72% | 2464 fps | 95.4% |
| Alliant Reloder-26 | 48.8 gr | 90% | 32,837 psi | 69% | 2484 fps | 96% |
| Bofors RP3 | <<locked>> | 80% | 39,755 psi | 83% | 2487 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 40,263 psi | 84% | 2454 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,364 psi | 84% | 2487 fps | 98.1% |
| Hodgdon H414 | <<locked>> | 84% | 37,391 psi | 78% | 2480 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,427 psi | 59% | 2247 fps | 96.7% |
| Hodgdon Superformance | <<locked>> | 86% | 39,320 psi | 82% | 2543 fps | 95.1% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,716 psi | 56% | 1467 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 40,596 psi | 85% | 2487 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,378 psi | 82% | 2438 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 29,863 psi | 62% | 2297 fps | 95.5% |
| Lovex S065 | <<locked>> | 80% | 34,505 psi | 72% | 2339 fps | 95.6% |
| Lovex S070 | <<locked>> | 84% | 37,246 psi | 78% | 2421 fps | 95.3% |
| Lovex S071 | <<locked>> | 98% | 33,924 psi | 71% | 2398 fps | 95.1% |
| Norma MRP | <<locked>> | 96% | 40,509 psi | 85% | 2621 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 31,009 psi | 65% | 2333 fps | 95.7% |
| Ramshot Hunter | <<locked>> | 84% | 34,389 psi | 72% | 2421 fps | 95% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,948 psi | 56% | 1496 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,695 psi | 77% | 2520 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,240 psi | 63% | 2343 fps | 95.1% |
| ReloadSwiss RS 70 | <<locked>> | 82% | 32,401 psi | 68% | 2398 fps | 95.1% |
| Rottweil R 903 | <<locked>> | 80% | 37,405 psi | 78% | 2434 fps | 99.3% |
| Rottweil R 907 | <<locked>> | 84% | 40,263 psi | 84% | 2454 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,505 psi | 72% | 2339 fps | 95.6% |
| Shooters World SW4350 | <<locked>> | 84% | 37,246 psi | 78% | 2421 fps | 95.3% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,174 psi | 80% | 2477 fps | 99% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,494 psi | 83% | 2365 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,392 psi | 80% | 2385 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 37,971 psi | 79% | 2434 fps | 99.3% |
| Somchem S365 | 40.1 gr | 80% | 27,789 psi | 58% | 2290 fps | 97.9% |
| Vihtavuori N150 | <<locked>> | 80% | 36,260 psi | 76% | 2375 fps | 99.7% |
| Vihtavuori N160 | <<locked>> | 80% | 32,256 psi | 67% | 2333 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 80% | 31,821 psi | 66% | 2336 fps | 95.8% |
| Vihtavuori N555 | <<locked>> | 86% | 28,950 psi | 60% | 2333 fps | 95.8% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,010 psi | 67% | 2313 fps | 98.2% |
| Winchester 760 | <<locked>> | 84% | 37,608 psi | 79% | 2487 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,861 psi | 56% | 2336 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 45 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 160gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,720 fps; across all powders the maximum-charge window runs from 1,640 fps to 2,720 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 45 of the 45 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 160.0 gr projectile in 0.284" calls for a 1:13.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-23, Alliant Reloder-25, 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, Alliant Reloder-16, Somchem S365 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 160gr | Speer Grand Slam 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.