Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 158gr | Prvi Partizan Grom 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, Somchem S365 and ReloadSwiss RS 70.
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.
A valid access license is required to use the Personalized Load Calculator.
You can find more information in our FAQ: How can I use the Personalized Load Calculator?
Max Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100ᴾ | <<locked>> | 100% | 41,133 psi | 86% | 2549 fps | 97% |
| Accurate 4064 | <<locked>> | 82% | 42,105 psi | 88% | 2503 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 40,843 psi | 85% | 2559 fps | 98.5% |
| ADI AR 2208 | <<locked>> | 82% | 40,872 psi | 85% | 2474 fps | 98.8% |
| Alliant Reloder- TS 15.5 | <<locked>> | 84% | 43,294 psi | 90% | 2546 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 92% | 42,975 psi | 90% | 2621 fps | 99.1% |
| Alliant Reloder-17 | <<locked>> | 88% | 42,917 psi | 90% | 2644 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 39,334 psi | 82% | 2575 fps | 99.5% |
| Alliant Reloder-26 | <<locked>> | 98% | 40,944 psi | 86% | 2674 fps | 98.3% |
| Bofors RP3 | <<locked>> | 84% | 43,163 psi | 90% | 2552 fps | 99.9% |
| Hodgdon H380 | <<locked>> | 82% | 41,336 psi | 86% | 2510 fps | 98% |
| Hodgdon H414 | <<locked>> | 88% | 40,915 psi | 85% | 2556 fps | 95.8% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 42,409 psi | 89% | 2559 fps | 99.7% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,476 psi | 74% | 1631 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 42,975 psi | 90% | 2503 fps | 99.2% |
| IMR 4451 Enduron | <<locked>> | 86% | 43,033 psi | 90% | 2510 fps | 96.1% |
| IMR 4831 | <<locked>> | 92% | 41,959 psi | 88% | 2562 fps | 98.7% |
| Lovex S062 | <<locked>> | 82% | 42,946 psi | 90% | 2507 fps | 99.9% |
| Lovex S065 | <<locked>> | 88% | 42,453 psi | 89% | 2507 fps | 97.5% |
| Lovex S070 | <<locked>> | 90% | 42,830 psi | 89% | 2533 fps | 96.5% |
| Norma 203B | <<locked>> | 82% | 42,989 psi | 90% | 2546 fps | 99.5% |
| Norma URP | <<locked>> | 90% | 40,741 psi | 85% | 2552 fps | 98.3% |
| Ramshot Big Game | <<locked>> | 82% | 42,627 psi | 89% | 2562 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 92% | 42,395 psi | 89% | 2595 fps | 97.2% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,216 psi | 76% | 1677 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 41,640 psi | 87% | 2490 fps | 96.5% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 42,830 psi | 89% | 2648 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 92% | 43,265 psi | 90% | 2631 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 92% | 43,250 psi | 90% | 2648 fps | 98.3% |
| Rottweil R 903 | <<locked>> | 84% | 40,480 psi | 85% | 2500 fps | 99.6% |
| Shooters World Long Rifle | <<locked>> | 88% | 42,453 psi | 89% | 2507 fps | 97.5% |
| Shooters World Precision | <<locked>> | 82% | 42,946 psi | 90% | 2507 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 90% | 42,830 psi | 89% | 2533 fps | 96.5% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 41,640 psi | 87% | 2549 fps | 99.3% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 43,236 psi | 90% | 2431 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 41,872 psi | 87% | 2454 fps | 96% |
| Somchem S355 | <<locked>> | 84% | 41,350 psi | 86% | 2503 fps | 99.5% |
| Somchem S365 | <<locked>> | 94% | 41,582 psi | 87% | 2612 fps | 100% |
| Vihtavuori N150 | <<locked>> | 86% | 42,047 psi | 88% | 2487 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 42,699 psi | 89% | 2552 fps | 98.6% |
| Vihtavuori N550 | <<locked>> | 90% | 42,090 psi | 88% | 2559 fps | 98.4% |
| Vihtavuori N555ᴾ | <<locked>> | 100% | 43,062 psi | 90% | 2648 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 42,496 psi | 89% | 2530 fps | 99.8% |
| Winchester 760 | <<locked>> | 88% | 40,915 psi | 85% | 2556 fps | 95.8% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 35,259 psi | 74% | 2592 fps | 99.5% |
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>> | 96% | 35,752 psi | 75% | 2441 fps | 95.3% |
| Accurate 4064 | <<locked>> | 80% | 39,653 psi | 83% | 2457 fps | 100% |
| Accurate 4350 | <<locked>> | 82% | 31,009 psi | 65% | 2346 fps | 95.6% |
| ADI AR 2208 | <<locked>> | 80% | 38,537 psi | 81% | 2428 fps | 98.3% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 38,203 psi | 80% | 2451 fps | 99.4% |
| Alliant Reloder-16 | <<locked>> | 82% | 31,705 psi | 66% | 2362 fps | 95.7% |
| Alliant Reloder-17 | <<locked>> | 80% | 32,837 psi | 69% | 2425 fps | 98% |
| Alliant Reloder-23 | <<locked>> | 88% | 27,340 psi | 57% | 2274 fps | 95.4% |
| Alliant Reloder-26 | 48.2 gr | 92% | 33,170 psi | 69% | 2490 fps | 95.6% |
| Bofors RP3 | <<locked>> | 80% | 37,956 psi | 79% | 2457 fps | 99.4% |
| Hodgdon H380 | <<locked>> | 80% | 38,711 psi | 81% | 2457 fps | 97.4% |
| Hodgdon H414 | <<locked>> | 86% | 38,305 psi | 80% | 2503 fps | 95% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 27,267 psi | 57% | 2218 fps | 95.7% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,643 psi | 56% | 1460 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 40,480 psi | 85% | 2457 fps | 98.9% |
| IMR 4451 Enduron | <<locked>> | 84% | 40,422 psi | 84% | 2457 fps | 95.3% |
| IMR 4831 | <<locked>> | 82% | 30,124 psi | 63% | 2306 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 40,480 psi | 85% | 2461 fps | 99.8% |
| Lovex S065 | <<locked>> | 82% | 35,230 psi | 74% | 2359 fps | 95.4% |
| Lovex S070 | <<locked>> | 86% | 37,884 psi | 79% | 2438 fps | 95% |
| Norma 203B | <<locked>> | 80% | 40,277 psi | 84% | 2497 fps | 99.2% |
| Norma URP | <<locked>> | 82% | 31,589 psi | 66% | 2352 fps | 95.6% |
| Ramshot Big Game | <<locked>> | 80% | 39,958 psi | 83% | 2513 fps | 99% |
| Ramshot Hunter | <<locked>> | 88% | 37,318 psi | 78% | 2490 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 26,861 psi | 56% | 1493 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 39,044 psi | 82% | 2441 fps | 95.8% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 34,969 psi | 73% | 2484 fps | 99.9% |
| ReloadSwiss RS 62 | <<locked>> | 84% | 32,909 psi | 69% | 2415 fps | 95.9% |
| ReloadSwiss RS 70 | 44.7 gr | 86% | 35,418 psi | 74% | 2474 fps | 95.9% |
| Rottweil R 903 | <<locked>> | 80% | 35,621 psi | 74% | 2402 fps | 98.8% |
| Shooters World Long Rifle | <<locked>> | 82% | 35,230 psi | 74% | 2359 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 40,480 psi | 85% | 2461 fps | 99.8% |
| Shooters World SW4350 | <<locked>> | 86% | 37,884 psi | 79% | 2438 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 36,521 psi | 76% | 2451 fps | 98.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 38,072 psi | 80% | 2346 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 39,175 psi | 82% | 2402 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 36,506 psi | 76% | 2408 fps | 98.8% |
| Somchem S365 | 38.8 gr | 80% | 26,455 psi | 55% | 2254 fps | 96.9% |
| Vihtavuori N150 | <<locked>> | 80% | 34,664 psi | 72% | 2346 fps | 99.3% |
| Vihtavuori N160 | <<locked>> | 80% | 30,792 psi | 64% | 2300 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 82% | 32,430 psi | 68% | 2356 fps | 95.6% |
| Vihtavuori N555 | <<locked>> | 88% | 29,240 psi | 61% | 2346 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 30,676 psi | 64% | 2280 fps | 97.3% |
| Winchester 760 | <<locked>> | 86% | 38,305 psi | 80% | 2503 fps | 95% |
| Winchester StaBALL HD | <<locked>> | 92% | 27,253 psi | 57% | 2343 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 | 158gr | Prvi Partizan Grom. Alliant Reloder-26 delivers the highest muzzle velocity at 2,674 fps; across all powders the maximum-charge window runs from 1,631 fps to 2,674 fps. Accurate 3100 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 74–90 %, leaving at least 10 % headroom. The 158.0 gr projectile in 0.284" calls for a 1:11.0 twist; slower twists will usually not stabilise this weight. Accurate 3100, Alliant Reloder-23, 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, Somchem S365, ReloadSwiss RS 70 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 158gr | Prvi Partizan Grom 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.