Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 170gr | Sierra RN Prohunter bullet and 44 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 3100 | <<locked>> | 98% | 42,467 psi | 89% | 2493 fps | 98.2% |
| Accurate 4350 | <<locked>> | 88% | 41,858 psi | 87% | 2493 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 41,060 psi | 86% | 2503 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 40,915 psi | 85% | 2523 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,975 psi | 90% | 2566 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,782 psi | 79% | 2484 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,047 psi | 88% | 2621 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 41,742 psi | 87% | 2411 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 86% | 41,669 psi | 87% | 2490 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 84% | 42,308 psi | 88% | 2454 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 43,207 psi | 90% | 2490 fps | 100% |
| Hodgdon Superformance | <<locked>> | 86% | 40,930 psi | 86% | 2507 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,926 psi | 75% | 1588 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 41,945 psi | 88% | 2438 fps | 96.5% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,712 psi | 85% | 2392 fps | 96.6% |
| IMR 4831 | <<locked>> | 90% | 42,844 psi | 90% | 2493 fps | 99.4% |
| Lovex S065 | <<locked>> | 86% | 42,931 psi | 90% | 2438 fps | 98.4% |
| Lovex S070 | <<locked>> | 86% | 40,973 psi | 86% | 2421 fps | 97% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,826 psi | 79% | 2405 fps | 97.1% |
| Norma MRP | <<locked>> | 96% | 42,134 psi | 88% | 2582 fps | 97.1% |
| Norma URP | <<locked>> | 88% | 41,872 psi | 87% | 2490 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 40,698 psi | 85% | 2484 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,434 psi | 76% | 1624 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 40,524 psi | 85% | 2520 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 41,510 psi | 87% | 2513 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 41,075 psi | 86% | 2530 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 82% | 41,263 psi | 86% | 2428 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 41,742 psi | 87% | 2411 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,931 psi | 90% | 2438 fps | 98.4% |
| Shooters World SW4350 | <<locked>> | 86% | 40,973 psi | 86% | 2421 fps | 97% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,380 psi | 89% | 2480 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 43,250 psi | 90% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,264 psi | 88% | 2385 fps | 97.1% |
| Somchem S355 | <<locked>> | 82% | 41,959 psi | 88% | 2431 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,888 psi | 90% | 2543 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,395 psi | 89% | 2484 fps | 96.6% |
| Vihtavuori N150 | <<locked>> | 84% | 42,641 psi | 89% | 2411 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 40,669 psi | 85% | 2434 fps | 98.9% |
| Vihtavuori N165 | <<locked>> | 98% | 41,684 psi | 87% | 2457 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 88% | 42,873 psi | 90% | 2493 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 96% | 42,018 psi | 88% | 2543 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 43,163 psi | 90% | 2464 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,669 psi | 87% | 2490 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,522 psi | 80% | 2602 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 90% | 32,329 psi | 68% | 2290 fps | 95.2% |
| Accurate 4350 | <<locked>> | 80% | 31,952 psi | 67% | 2293 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,966 psi | 67% | 2300 fps | 97.1% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,694 psi | 75% | 2415 fps | 99.4% |
| Alliant Reloder-23 | <<locked>> | 82% | 24,772 psi | 52% | 2129 fps | 95.2% |
| Alliant Reloder-25 | <<locked>> | 94% | 31,560 psi | 66% | 2329 fps | 95% |
| Alliant Reloder-26 | <<locked>> | 86% | 29,675 psi | 62% | 2329 fps | 95.3% |
| Bofors RP7 | <<locked>> | 82% | 39,146 psi | 82% | 2359 fps | 95.6% |
| Hodgdon H414 | <<locked>> | 82% | 36,347 psi | 76% | 2385 fps | 95.5% |
| Hodgdon H4350 | <<locked>> | 82% | 39,697 psi | 83% | 2405 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,544 psi | 62% | 2211 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 84% | 38,145 psi | 80% | 2448 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,919 psi | 56% | 1417 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 39,421 psi | 82% | 2388 fps | 95.7% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,261 psi | 80% | 2343 fps | 95.8% |
| IMR 4831 | <<locked>> | 80% | 30,966 psi | 65% | 2251 fps | 96.7% |
| Lovex S065 | <<locked>> | 80% | 35,737 psi | 75% | 2297 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 36,100 psi | 75% | 2323 fps | 95.6% |
| Lovex S071 | <<locked>> | 96% | 33,243 psi | 69% | 2313 fps | 95.6% |
| Norma MRP | <<locked>> | 92% | 36,811 psi | 77% | 2470 fps | 95.4% |
| Norma URP | <<locked>> | 80% | 32,097 psi | 67% | 2290 fps | 96.9% |
| Ramshot Hunter | <<locked>> | 82% | 33,460 psi | 70% | 2326 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,180 psi | 57% | 1450 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,942 psi | 79% | 2470 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,633 psi | 66% | 2306 fps | 96.5% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 31,502 psi | 66% | 2310 fps | 95.5% |
| Rottweil R 903 | <<locked>> | 80% | 38,609 psi | 81% | 2379 fps | 99.7% |
| Rottweil R 907 | <<locked>> | 82% | 39,146 psi | 82% | 2359 fps | 95.6% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,737 psi | 75% | 2297 fps | 96.7% |
| Shooters World SW4350 | <<locked>> | 82% | 36,100 psi | 75% | 2323 fps | 95.6% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,711 psi | 83% | 2431 fps | 99.5% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,770 psi | 85% | 2310 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 34,998 psi | 73% | 2244 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 39,334 psi | 82% | 2382 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 28,964 psi | 61% | 2254 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 37,246 psi | 78% | 2385 fps | 95% |
| Vihtavuori N150 | <<locked>> | 80% | 37,391 psi | 78% | 2320 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 33,576 psi | 70% | 2290 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 39,102 psi | 82% | 2408 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 32,924 psi | 69% | 2290 fps | 96.9% |
| Vihtavuori N555 | <<locked>> | 82% | 26,600 psi | 56% | 2198 fps | 95.4% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,054 psi | 69% | 2267 fps | 98.9% |
| Winchester 760 | <<locked>> | 82% | 36,579 psi | 76% | 2388 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,598 psi | 51% | 2195 fps | 95.6% |
ᴾ possible press load - work up slowly to this load while watching for signs of excessive pressure.
This overview compares 44 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 170gr | Sierra RN Prohunter. Alliant Reloder-26 delivers the highest muzzle velocity at 2,621 fps; across all powders the maximum-charge window runs from 1,588 fps to 2,621 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 44 of the 44 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 170.0 gr projectile in 0.284" calls for a 1:12.5 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.