Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 170gr | Geco PLUS 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, ReloadSwiss RS 70 and Vihtavuori N555.
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% | 42,714 psi | 89% | 2497 fps | 98.2% |
| Accurate 4350 | <<locked>> | 88% | 42,148 psi | 88% | 2500 fps | 99.3% |
| Alliant Reloder-16 | <<locked>> | 88% | 41,336 psi | 86% | 2510 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 84% | 40,915 psi | 85% | 2526 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 98% | 42,917 psi | 90% | 2566 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 43,221 psi | 90% | 2572 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,985 psi | 79% | 2490 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,264 psi | 88% | 2628 fps | 99.4% |
| Bofors RP5 | <<locked>> | 98% | 42,917 psi | 90% | 2566 fps | 95.9% |
| Bofors RP7 | <<locked>> | 84% | 41,742 psi | 87% | 2411 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 86% | 41,669 psi | 87% | 2493 fps | 97.1% |
| Hodgdon H4350 | <<locked>> | 84% | 42,583 psi | 89% | 2461 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 40,654 psi | 85% | 2448 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 40,872 psi | 85% | 2507 fps | 96.4% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,056 psi | 75% | 1591 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 42,235 psi | 88% | 2444 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 82% | 40,741 psi | 85% | 2392 fps | 96.6% |
| IMR 4831 | <<locked>> | 90% | 43,091 psi | 90% | 2500 fps | 99.5% |
| Lovex S065 | <<locked>> | 86% | 43,207 psi | 90% | 2444 fps | 98.5% |
| Lovex S070 | <<locked>> | 86% | 41,017 psi | 86% | 2425 fps | 97.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 38,043 psi | 79% | 2411 fps | 97.2% |
| Norma MRP | <<locked>> | 96% | 42,322 psi | 88% | 2589 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 41,872 psi | 87% | 2493 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 40,669 psi | 85% | 2484 fps | 97.7% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,564 psi | 76% | 1627 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 40,785 psi | 85% | 2523 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 41,771 psi | 87% | 2520 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 41,031 psi | 86% | 2530 fps | 98.7% |
| Rottweil R 903 | <<locked>> | 82% | 41,582 psi | 87% | 2434 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 41,742 psi | 87% | 2411 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 86% | 43,207 psi | 90% | 2444 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 86% | 41,017 psi | 86% | 2425 fps | 97.1% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 42,395 psi | 89% | 2480 fps | 99.8% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 42,569 psi | 89% | 2392 fps | 97.2% |
| Somchem S355 | <<locked>> | 82% | 41,989 psi | 88% | 2431 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,859 psi | 90% | 2546 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 42,641 psi | 89% | 2490 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 84% | 42,656 psi | 89% | 2415 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 40,988 psi | 86% | 2441 fps | 99% |
| Vihtavuori N165 | <<locked>> | 98% | 41,916 psi | 88% | 2464 fps | 96% |
| Vihtavuori N550 | <<locked>> | 88% | 42,859 psi | 90% | 2493 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 96% | 42,047 psi | 88% | 2543 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 43,120 psi | 90% | 2464 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,974 psi | 88% | 2500 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 38,740 psi | 81% | 2608 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% | 32,576 psi | 68% | 2297 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 32,024 psi | 67% | 2293 fps | 97% |
| Alliant Reloder-16 | <<locked>> | 80% | 32,169 psi | 67% | 2306 fps | 97.2% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,926 psi | 75% | 2425 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 40,263 psi | 84% | 2513 fps | 95% |
| Alliant Reloder-23 | <<locked>> | 82% | 24,787 psi | 52% | 2133 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 94% | 31,575 psi | 66% | 2329 fps | 95% |
| Alliant Reloder-26 | 46 gr | 86% | 29,863 psi | 62% | 2336 fps | 95.4% |
| Bofors RP5 | <<locked>> | 96% | 40,263 psi | 84% | 2513 fps | 95% |
| Bofors RP7 | <<locked>> | 82% | 39,407 psi | 82% | 2365 fps | 95.7% |
| Hodgdon H414 | <<locked>> | 82% | 36,593 psi | 76% | 2392 fps | 95.6% |
| Hodgdon H4350 | <<locked>> | 82% | 39,958 psi | 83% | 2411 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,573 psi | 62% | 2211 fps | 97.8% |
| Hodgdon Superformance | <<locked>> | 84% | 38,130 psi | 80% | 2448 fps | 95.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,803 psi | 56% | 1417 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 37,246 psi | 78% | 2346 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 38,232 psi | 80% | 2343 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 31,212 psi | 65% | 2257 fps | 96.8% |
| Lovex S065 | <<locked>> | 80% | 35,766 psi | 75% | 2297 fps | 96.7% |
| Lovex S070 | <<locked>> | 82% | 36,361 psi | 76% | 2329 fps | 95.7% |
| Lovex S071 | <<locked>> | 96% | 33,460 psi | 70% | 2316 fps | 95.7% |
| Norma MRP | <<locked>> | 92% | 37,014 psi | 77% | 2474 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 32,329 psi | 68% | 2297 fps | 97% |
| Ramshot Hunter | <<locked>> | 82% | 33,460 psi | 70% | 2329 fps | 95.4% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,340 psi | 57% | 1453 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,247 psi | 80% | 2477 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,691 psi | 66% | 2310 fps | 96.5% |
| ReloadSwiss RS 70 | 42.4 gr | 80% | 31,502 psi | 66% | 2310 fps | 95.6% |
| Rottweil R 903 | <<locked>> | 80% | 38,928 psi | 81% | 2385 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 82% | 39,407 psi | 82% | 2365 fps | 95.7% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,766 psi | 75% | 2297 fps | 96.7% |
| Shooters World SW4350 | <<locked>> | 82% | 36,361 psi | 76% | 2329 fps | 95.7% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,740 psi | 83% | 2434 fps | 99.5% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 35,012 psi | 73% | 2247 fps | 95% |
| Somchem S355 | <<locked>> | 80% | 39,378 psi | 82% | 2385 fps | 99.7% |
| Somchem S365 | <<locked>> | 80% | 28,979 psi | 61% | 2254 fps | 98.9% |
| Somchem S385 | <<locked>> | 90% | 37,507 psi | 78% | 2392 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 37,652 psi | 79% | 2326 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 33,605 psi | 70% | 2293 fps | 97.3% |
| Vihtavuori N165 | <<locked>> | 96% | 39,334 psi | 82% | 2415 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 33,170 psi | 69% | 2300 fps | 97% |
| Vihtavuori N555 | 40 gr | 82% | 26,658 psi | 56% | 2201 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 33,054 psi | 69% | 2270 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 36,593 psi | 76% | 2392 fps | 95.6% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,758 psi | 52% | 2205 fps | 95.8% |
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 | 170gr | Geco PLUS. Alliant Reloder-26 delivers the highest muzzle velocity at 2,628 fps; across all powders the maximum-charge window runs from 1,591 fps to 2,628 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 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. Alliant Reloder-26, ReloadSwiss RS 70, Vihtavuori N555 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 170gr | Geco PLUS 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.