Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 175gr | Speer Grand Slam bullet and 46 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 Norma MRP.
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% | 42,873 psi | 90% | 2461 fps | 98.5% |
| Accurate 4350 | <<locked>> | 88% | 42,337 psi | 88% | 2461 fps | 99.5% |
| Alliant Reloder-16 | <<locked>> | 88% | 41,394 psi | 86% | 2470 fps | 99.6% |
| Alliant Reloder-17 | <<locked>> | 84% | 41,321 psi | 86% | 2490 fps | 100% |
| Alliant Reloder-23 | <<locked>> | 98% | 40,872 psi | 85% | 2487 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,348 psi | 80% | 2461 fps | 98.1% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,511 psi | 89% | 2592 fps | 99.5% |
| Bofors RP15ᴾ | <<locked>> | 100% | 42,453 psi | 89% | 2516 fps | 95.8% |
| Bofors RP7 | <<locked>> | 84% | 42,003 psi | 88% | 2375 fps | 96.7% |
| Hodgdon H414 | <<locked>> | 86% | 42,148 psi | 88% | 2461 fps | 97.5% |
| Hodgdon H4350 | <<locked>> | 84% | 42,641 psi | 89% | 2425 fps | 96.2% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 41,104 psi | 86% | 2415 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 41,176 psi | 86% | 2474 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 75% | 1558 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 42,351 psi | 88% | 2408 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,930 psi | 86% | 2356 fps | 96.9% |
| IMR 4831 | <<locked>> | 88% | 40,785 psi | 85% | 2421 fps | 99.3% |
| Lovex S065 | <<locked>> | 84% | 40,799 psi | 85% | 2362 fps | 98.2% |
| Lovex S070 | <<locked>> | 86% | 41,336 psi | 86% | 2392 fps | 97.4% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,363 psi | 80% | 2382 fps | 97.5% |
| Norma MRP | <<locked>> | 96% | 42,496 psi | 89% | 2549 fps | 97.5% |
| Norma URP | <<locked>> | 88% | 42,264 psi | 88% | 2457 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 88% | 41,162 psi | 86% | 2454 fps | 98% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,579 psi | 76% | 1598 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 41,176 psi | 86% | 2490 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 42,090 psi | 88% | 2484 fps | 99.3% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 41,553 psi | 87% | 2500 fps | 99% |
| Rottweil R 903 | <<locked>> | 82% | 41,829 psi | 87% | 2398 fps | 100% |
| Rottweil R 905 | <<locked>> | 94% | 42,177 psi | 88% | 2470 fps | 96% |
| Rottweil R 907 | <<locked>> | 84% | 42,003 psi | 88% | 2375 fps | 96.7% |
| Shooters World Long Rifle | <<locked>> | 84% | 40,799 psi | 85% | 2362 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 86% | 41,336 psi | 86% | 2392 fps | 97.4% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,772 psi | 89% | 2448 fps | 99.9% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,888 psi | 90% | 2359 fps | 97.5% |
| SNPE Vectan Tubal 8000 | <<locked>> | 94% | 41,771 psi | 87% | 2464 fps | 95.8% |
| Somchem S355 | <<locked>> | 82% | 42,235 psi | 88% | 2395 fps | 100% |
| Somchem S365 | <<locked>> | 90% | 40,596 psi | 85% | 2464 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,975 psi | 90% | 2457 fps | 97% |
| Vihtavuori N150 | <<locked>> | 84% | 42,946 psi | 90% | 2379 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 41,350 psi | 86% | 2408 fps | 99.2% |
| Vihtavuori N165 | <<locked>> | 98% | 42,032 psi | 88% | 2428 fps | 96.3% |
| Vihtavuori N550 | <<locked>> | 86% | 40,654 psi | 85% | 2411 fps | 99% |
| Vihtavuori N555 | <<locked>> | 96% | 42,395 psi | 89% | 2507 fps | 99.8% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 40,770 psi | 85% | 2385 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 42,148 psi | 88% | 2461 fps | 97.5% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,986 psi | 81% | 2572 fps | 100% |
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>> | 90% | 32,779 psi | 68% | 2267 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 32,242 psi | 67% | 2264 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,329 psi | 68% | 2274 fps | 97.5% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,998 psi | 75% | 2385 fps | 99.6% |
| Alliant Reloder-23 | <<locked>> | 82% | 24,932 psi | 52% | 2103 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 94% | 31,778 psi | 66% | 2300 fps | 95.5% |
| Alliant Reloder-26 | 45.2 gr | 86% | 30,081 psi | 63% | 2306 fps | 95.9% |
| Bofors RP15 | <<locked>> | 98% | 39,827 psi | 83% | 2464 fps | 95% |
| Bofors RP7 | <<locked>> | 80% | 37,115 psi | 78% | 2280 fps | 95.2% |
| Hodgdon H414 | <<locked>> | 80% | 34,548 psi | 72% | 2306 fps | 95.2% |
| Hodgdon H4350 | <<locked>> | 82% | 40,001 psi | 84% | 2372 fps | 95.4% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,936 psi | 63% | 2185 fps | 98.2% |
| Hodgdon Superformance | <<locked>> | 82% | 35,998 psi | 75% | 2365 fps | 95% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,905 psi | 56% | 1391 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 37,478 psi | 78% | 2313 fps | 95.4% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,667 psi | 81% | 2313 fps | 96.2% |
| IMR 4831 | <<locked>> | 80% | 31,401 psi | 66% | 2228 fps | 97.1% |
| Lovex S065 | <<locked>> | 80% | 36,143 psi | 76% | 2267 fps | 97% |
| Lovex S070 | <<locked>> | 80% | 34,287 psi | 72% | 2247 fps | 95.2% |
| Lovex S071 | <<locked>> | 94% | 31,662 psi | 66% | 2241 fps | 95.3% |
| Norma MRP | 47 gr | 92% | 37,333 psi | 78% | 2444 fps | 95.9% |
| Norma URP | <<locked>> | 80% | 32,518 psi | 68% | 2264 fps | 97.3% |
| Ramshot Hunter | <<locked>> | 82% | 33,721 psi | 70% | 2300 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,195 psi | 57% | 1424 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,276 psi | 80% | 2438 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,937 psi | 67% | 2277 fps | 96.9% |
| ReloadSwiss RS 70 | 41.7 gr | 80% | 31,749 psi | 66% | 2280 fps | 96% |
| Rottweil R 903 | <<locked>> | 80% | 39,117 psi | 82% | 2349 fps | 99.8% |
| Rottweil R 905 | <<locked>> | 92% | 39,711 psi | 83% | 2421 fps | 95.2% |
| Rottweil R 907 | <<locked>> | 80% | 37,115 psi | 78% | 2280 fps | 95.2% |
| Shooters World Long Rifle | <<locked>> | 80% | 36,143 psi | 76% | 2267 fps | 97% |
| Shooters World SW4350 | <<locked>> | 80% | 34,287 psi | 72% | 2247 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 40,030 psi | 84% | 2398 fps | 99.7% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,201 psi | 74% | 2215 fps | 95.3% |
| SNPE Vectan Tubal 8000 | <<locked>> | 92% | 39,363 psi | 82% | 2418 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 39,813 psi | 83% | 2352 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 29,153 psi | 61% | 2224 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 37,695 psi | 79% | 2359 fps | 95.5% |
| Vihtavuori N150 | <<locked>> | 80% | 37,869 psi | 79% | 2290 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 33,808 psi | 71% | 2260 fps | 97.6% |
| Vihtavuori N165 | <<locked>> | 96% | 39,610 psi | 83% | 2382 fps | 95.6% |
| Vihtavuori N550 | <<locked>> | 80% | 33,446 psi | 70% | 2267 fps | 97.3% |
| Vihtavuori N555 | <<locked>> | 80% | 25,266 psi | 53% | 2126 fps | 95% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,315 psi | 70% | 2238 fps | 99.2% |
| Winchester 760 | <<locked>> | 80% | 34,548 psi | 72% | 2306 fps | 95.2% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,889 psi | 52% | 2178 fps | 96.4% |
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 46 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 175gr | Speer Grand Slam. Alliant Reloder-26 delivers the highest muzzle velocity at 2,592 fps; across all powders the maximum-charge window runs from 1,558 fps to 2,592 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 46 of the 46 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 175.0 gr projectile in 0.284" calls for a 1:12.0 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Bofors RP15, 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, Norma MRP rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 175gr | 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.