Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 175gr | Barnes X S bullet and 41 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 Winchester StaBALL HD.
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>> | 96% | 41,278 psi | 86% | 2388 fps | 97.7% |
| Accurate 4350 | <<locked>> | 86% | 40,886 psi | 85% | 2392 fps | 99% |
| Alliant Reloder-16 | <<locked>> | 88% | 41,785 psi | 87% | 2431 fps | 99.3% |
| Alliant Reloder-17 | <<locked>> | 84% | 41,640 psi | 87% | 2451 fps | 99.9% |
| Alliant Reloder-23 | <<locked>> | 98% | 41,321 psi | 86% | 2454 fps | 99.9% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 38,696 psi | 81% | 2415 fps | 97.6% |
| Alliant Reloder-26 | <<locked>> | 96% | 42,975 psi | 90% | 2552 fps | 99.3% |
| Bofors RP7 | <<locked>> | 84% | 42,844 psi | 90% | 2343 fps | 96.4% |
| Hodgdon H414 | <<locked>> | 86% | 42,438 psi | 89% | 2421 fps | 97.1% |
| Hodgdon Hybrid 100V | <<locked>> | 90% | 41,626 psi | 87% | 2382 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 86% | 41,800 psi | 87% | 2438 fps | 96.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 36,419 psi | 76% | 1532 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 42,844 psi | 90% | 2372 fps | 96.4% |
| IMR 4451 Enduron | <<locked>> | 82% | 41,611 psi | 87% | 2323 fps | 96.5% |
| IMR 4831 | <<locked>> | 88% | 41,379 psi | 86% | 2385 fps | 99.1% |
| Lovex S065 | <<locked>> | 84% | 41,742 psi | 87% | 2329 fps | 98% |
| Lovex S070 | <<locked>> | 86% | 42,206 psi | 88% | 2359 fps | 97.1% |
| Lovex S071ᴾ | <<locked>> | 100% | 39,334 psi | 82% | 2352 fps | 97.2% |
| Norma MRP | <<locked>> | 96% | 42,931 psi | 90% | 2513 fps | 97% |
| Norma URP | <<locked>> | 88% | 42,859 psi | 90% | 2425 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 88% | 41,466 psi | 87% | 2415 fps | 97.6% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 37,072 psi | 77% | 1568 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 82% | 41,655 psi | 87% | 2454 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 42,496 psi | 89% | 2448 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 88% | 41,829 psi | 87% | 2457 fps | 98.6% |
| Rottweil R 903 | <<locked>> | 82% | 42,844 psi | 90% | 2369 fps | 99.9% |
| Rottweil R 907 | <<locked>> | 84% | 42,844 psi | 90% | 2343 fps | 96.4% |
| Shooters World Long Rifle | <<locked>> | 84% | 41,742 psi | 87% | 2329 fps | 98% |
| Shooters World SW4350 | <<locked>> | 86% | 42,206 psi | 88% | 2359 fps | 97.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 40,973 psi | 86% | 2277 fps | 96.5% |
| Somchem S355 | <<locked>> | 82% | 43,250 psi | 90% | 2365 fps | 99.9% |
| Somchem S365 | <<locked>> | 90% | 41,118 psi | 86% | 2434 fps | 100% |
| Somchem S385 | <<locked>> | 92% | 41,002 psi | 86% | 2375 fps | 95.9% |
| Vihtavuori N150 | <<locked>> | 82% | 41,147 psi | 86% | 2306 fps | 100% |
| Vihtavuori N160 | <<locked>> | 86% | 41,843 psi | 87% | 2372 fps | 99% |
| Vihtavuori N165 | <<locked>> | 98% | 42,612 psi | 89% | 2392 fps | 95.8% |
| Vihtavuori N550 | <<locked>> | 86% | 41,162 psi | 86% | 2379 fps | 98.7% |
| Vihtavuori N555 | <<locked>> | 96% | 43,033 psi | 90% | 2477 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 86% | 41,205 psi | 86% | 2349 fps | 99.9% |
| Winchester 760 | <<locked>> | 86% | 42,438 psi | 89% | 2421 fps | 97.1% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 39,610 psi | 83% | 2536 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% | 34,229 psi | 72% | 2251 fps | 95.7% |
| Accurate 4350 | <<locked>> | 80% | 33,779 psi | 71% | 2247 fps | 97.4% |
| Alliant Reloder-16 | <<locked>> | 80% | 33,388 psi | 70% | 2251 fps | 97.4% |
| Alliant Reloder-17 | <<locked>> | 80% | 36,825 psi | 77% | 2356 fps | 99.5% |
| Alliant Reloder-23 | <<locked>> | 80% | 25,034 psi | 52% | 2054 fps | 95.1% |
| Alliant Reloder-25 | <<locked>> | 94% | 32,851 psi | 69% | 2277 fps | 95.2% |
| Alliant Reloder-26 | 42.4 gr | 86% | 31,256 psi | 65% | 2287 fps | 95.7% |
| Bofors RP7 | <<locked>> | 80% | 38,116 psi | 80% | 2251 fps | 95% |
| Hodgdon H414 | <<locked>> | 82% | 37,507 psi | 78% | 2326 fps | 95.6% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 30,937 psi | 65% | 2162 fps | 98.1% |
| Hodgdon Superformance | <<locked>> | 84% | 39,001 psi | 81% | 2379 fps | 95.4% |
| Hodgdon TrailBoss | <<locked>> | 80% | 27,325 psi | 57% | 1368 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 37,956 psi | 79% | 2277 fps | 95% |
| IMR 4451 Enduron | <<locked>> | 80% | 39,262 psi | 82% | 2277 fps | 95.9% |
| IMR 4831 | <<locked>> | 80% | 32,634 psi | 68% | 2208 fps | 97.1% |
| Lovex S065 | <<locked>> | 80% | 37,289 psi | 78% | 2244 fps | 96.9% |
| Lovex S070 | <<locked>> | 80% | 35,534 psi | 74% | 2224 fps | 95.1% |
| Lovex S071 | <<locked>> | 94% | 33,069 psi | 69% | 2224 fps | 95.2% |
| Norma MRP | <<locked>> | 92% | 38,029 psi | 79% | 2411 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 33,533 psi | 70% | 2241 fps | 97.1% |
| Ramshot Hunter | <<locked>> | 82% | 34,722 psi | 73% | 2274 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,717 psi | 58% | 1398 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 38,972 psi | 81% | 2405 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 33,170 psi | 69% | 2260 fps | 96.8% |
| ReloadSwiss RS 70 | 39.1 gr | 80% | 32,721 psi | 68% | 2257 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 40,393 psi | 84% | 2326 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 80% | 38,116 psi | 80% | 2251 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 37,289 psi | 78% | 2244 fps | 96.9% |
| Shooters World SW4350 | <<locked>> | 80% | 35,534 psi | 74% | 2224 fps | 95.1% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 36,390 psi | 76% | 2192 fps | 95.2% |
| Somchem S355 | <<locked>> | 80% | 40,799 psi | 85% | 2323 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 30,472 psi | 64% | 2208 fps | 99.1% |
| Somchem S385 | <<locked>> | 90% | 38,653 psi | 81% | 2329 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 38,798 psi | 81% | 2264 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 34,795 psi | 73% | 2234 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 40,176 psi | 84% | 2346 fps | 95.1% |
| Vihtavuori N550 | <<locked>> | 80% | 34,403 psi | 72% | 2241 fps | 97.1% |
| Vihtavuori N555 | <<locked>> | 80% | 26,876 psi | 56% | 2123 fps | 95.3% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 34,171 psi | 71% | 2211 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 37,753 psi | 79% | 2329 fps | 95.7% |
| Winchester StaBALL HD | 39.8 gr | 84% | 24,990 psi | 52% | 2119 fps | 95.4% |
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 41 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 175gr | Barnes X S. Alliant Reloder-26 delivers the highest muzzle velocity at 2,552 fps; across all powders the maximum-charge window runs from 1,532 fps to 2,552 fps. Alliant Reloder-25 gives the best case fill at 100 %, and 41 of the 41 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (330 MPa), the top charges use 76–90 %, leaving at least 10 % headroom. The 175.0 gr projectile in 0.284" calls for a 1:9.5 twist; slower twists will usually not stabilise this weight. Alliant Reloder-25, Hodgdon TrailBoss, Lovex S071 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, Winchester StaBALL HD rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 175gr | Barnes X S 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.