Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 180gr | Sierra MatchKing bullet and 48 powders. The key underlying parameters are shown in the table above. The recommended powders for this cartridge and bullet combination are Alliant Reloder-26, Norma MRP 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% | 41,553 psi | 87% | 2388 fps | 98.2% |
| Accurate 4350 | <<locked>> | 88% | 41,350 psi | 86% | 2395 fps | 99.3% |
| ADI AR 2208 | <<locked>> | 82% | 43,279 psi | 90% | 2346 fps | 99.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 43,279 psi | 90% | 2369 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 43,076 psi | 90% | 2451 fps | 99.7% |
| Alliant Reloder-17 | <<locked>> | 86% | 43,091 psi | 90% | 2470 fps | 100% |
| Alliant Reloder-22 | <<locked>> | 98% | 41,989 psi | 88% | 2457 fps | 95.9% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 42,395 psi | 89% | 2467 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 37,188 psi | 78% | 2385 fps | 97.7% |
| Alliant Reloder-26 | <<locked>> | 96% | 41,278 psi | 86% | 2516 fps | 99.4% |
| Bofors RP5 | <<locked>> | 98% | 41,989 psi | 88% | 2457 fps | 95.9% |
| Bofors RP7 | <<locked>> | 84% | 41,263 psi | 86% | 2313 fps | 96.5% |
| Hodgdon H414 | <<locked>> | 86% | 41,002 psi | 86% | 2392 fps | 97.2% |
| Hodgdon H4350 | <<locked>> | 84% | 41,698 psi | 87% | 2356 fps | 95.9% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 42,525 psi | 89% | 2388 fps | 100% |
| Hodgdon Superformance | <<locked>> | 88% | 43,047 psi | 90% | 2457 fps | 97.3% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,853 psi | 75% | 1516 fps | 100% |
| IMR 4350 | <<locked>> | 88% | 41,278 psi | 86% | 2339 fps | 96.6% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,627 psi | 89% | 2339 fps | 97.3% |
| IMR 4831 | <<locked>> | 90% | 42,206 psi | 88% | 2395 fps | 99.5% |
| Lovex S065 | <<locked>> | 86% | 42,569 psi | 89% | 2343 fps | 98.5% |
| Lovex S070 | <<locked>> | 88% | 42,917 psi | 90% | 2369 fps | 97.7% |
| Lovex S071ᴾ | <<locked>> | 100% | 37,014 psi | 77% | 2310 fps | 97.1% |
| Norma MRP | <<locked>> | 96% | 41,452 psi | 87% | 2480 fps | 97.2% |
| Norma URP | <<locked>> | 88% | 41,075 psi | 86% | 2388 fps | 99.2% |
| Ramshot Hunter | <<locked>> | 90% | 42,757 psi | 89% | 2434 fps | 98.4% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,390 psi | 76% | 1552 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,801 psi | 89% | 2467 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 88% | 40,770 psi | 85% | 2411 fps | 99.1% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 43,091 psi | 90% | 2480 fps | 99.2% |
| Rottweil R 903 | <<locked>> | 82% | 40,915 psi | 85% | 2333 fps | 100% |
| Rottweil R 907 | <<locked>> | 84% | 41,263 psi | 86% | 2313 fps | 96.5% |
| Shooters World Long Rifle | <<locked>> | 86% | 42,569 psi | 89% | 2343 fps | 98.5% |
| Shooters World SW4350 | <<locked>> | 88% | 42,917 psi | 90% | 2369 fps | 97.7% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 41,713 psi | 87% | 2379 fps | 99.8% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,960 psi | 90% | 2254 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,785 psi | 87% | 2293 fps | 97.2% |
| Somchem S355 | <<locked>> | 82% | 41,307 psi | 86% | 2333 fps | 99.9% |
| Somchem S365 | <<locked>> | 92% | 42,076 psi | 88% | 2441 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 41,597 psi | 87% | 2382 fps | 96.7% |
| Vihtavuori N150 | <<locked>> | 84% | 42,134 psi | 88% | 2316 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 43,004 psi | 90% | 2388 fps | 99.4% |
| Vihtavuori N165 | <<locked>> | 98% | 40,915 psi | 85% | 2359 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 88% | 42,293 psi | 88% | 2392 fps | 99.2% |
| Vihtavuori N555 | <<locked>> | 96% | 41,075 psi | 86% | 2438 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 42,424 psi | 89% | 2365 fps | 100% |
| Winchester 760 | <<locked>> | 86% | 41,002 psi | 86% | 2392 fps | 97.2% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,884 psi | 79% | 2500 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% | 31,792 psi | 66% | 2201 fps | 95.4% |
| Accurate 4350 | <<locked>> | 80% | 31,328 psi | 65% | 2198 fps | 97.1% |
| ADI AR 2208 | <<locked>> | 80% | 40,683 psi | 85% | 2303 fps | 99.4% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 40,654 psi | 85% | 2323 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,734 psi | 66% | 2215 fps | 97.3% |
| Alliant Reloder-17 | <<locked>> | 80% | 35,317 psi | 74% | 2323 fps | 99.5% |
| Alliant Reloder-22 | <<locked>> | 96% | 39,479 psi | 82% | 2411 fps | 95.1% |
| Alliant Reloder-23 | <<locked>> | 82% | 24,352 psi | 51% | 2044 fps | 95.4% |
| Alliant Reloder-25 | <<locked>> | 94% | 30,995 psi | 65% | 2234 fps | 95.1% |
| Alliant Reloder-26 | 43.1 gr | 86% | 29,196 psi | 61% | 2238 fps | 95.4% |
| Bofors RP5 | <<locked>> | 96% | 39,479 psi | 82% | 2411 fps | 95.1% |
| Bofors RP7 | <<locked>> | 80% | 36,274 psi | 76% | 2218 fps | 95% |
| Hodgdon H414 | <<locked>> | 82% | 35,969 psi | 75% | 2293 fps | 95.7% |
| Hodgdon H4350 | <<locked>> | 82% | 39,233 psi | 82% | 2310 fps | 95.2% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 29,080 psi | 61% | 2119 fps | 97.9% |
| Hodgdon Superformance | <<locked>> | 84% | 37,666 psi | 79% | 2352 fps | 95.6% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 56% | 1355 fps | 100% |
| IMR 4350 | <<locked>> | 84% | 36,608 psi | 76% | 2247 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,811 psi | 79% | 2247 fps | 96% |
| IMR 4831 | <<locked>> | 80% | 30,560 psi | 64% | 2165 fps | 96.9% |
| Lovex S065 | <<locked>> | 80% | 35,273 psi | 74% | 2205 fps | 96.8% |
| Lovex S070 | <<locked>> | 80% | 33,475 psi | 70% | 2185 fps | 95% |
| Lovex S071 | <<locked>> | 96% | 32,750 psi | 68% | 2221 fps | 95.8% |
| Norma MRP | 44.8 gr | 92% | 36,216 psi | 76% | 2372 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 31,647 psi | 66% | 2198 fps | 97% |
| Ramshot Hunter | <<locked>> | 82% | 32,909 psi | 69% | 2234 fps | 95.5% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,151 psi | 57% | 1385 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 37,594 psi | 79% | 2372 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 31,053 psi | 65% | 2215 fps | 96.6% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 31,067 psi | 65% | 2218 fps | 95.7% |
| Rottweil R 903 | <<locked>> | 80% | 38,130 psi | 80% | 2283 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 80% | 36,274 psi | 76% | 2218 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 35,273 psi | 74% | 2205 fps | 96.8% |
| Shooters World SW4350 | <<locked>> | 80% | 33,475 psi | 70% | 2185 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 39,233 psi | 82% | 2336 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 40,350 psi | 84% | 2215 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 80% | 34,403 psi | 72% | 2152 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 38,827 psi | 81% | 2287 fps | 99.8% |
| Somchem S365 | <<locked>> | 80% | 28,398 psi | 59% | 2162 fps | 99% |
| Somchem S385 | <<locked>> | 90% | 36,796 psi | 77% | 2293 fps | 95.2% |
| Vihtavuori N150 | <<locked>> | 80% | 36,941 psi | 77% | 2228 fps | 100% |
| Vihtavuori N160 | <<locked>> | 80% | 32,967 psi | 69% | 2198 fps | 97.4% |
| Vihtavuori N165 | <<locked>> | 96% | 38,493 psi | 80% | 2313 fps | 95.2% |
| Vihtavuori N550 | <<locked>> | 80% | 32,445 psi | 68% | 2201 fps | 97% |
| Vihtavuori N555 | 37.5 gr | 82% | 26,092 psi | 55% | 2110 fps | 95.6% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,663 psi | 68% | 2178 fps | 99% |
| Winchester 760 | <<locked>> | 82% | 35,969 psi | 75% | 2293 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 86% | 24,250 psi | 51% | 2113 fps | 95.9% |
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 48 powders for 7 mm Mag. Fl. H&H loaded with the .284 | 180gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,516 fps; across all powders the maximum-charge window runs from 1,516 fps to 2,516 fps. Alliant Reloder-23 gives the best case fill at 100 %, and 48 of the 48 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 180.0 gr projectile in 0.284" calls for a 1:10.0 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, Norma MRP, Vihtavuori N555 rank at the top here: for 7 mm Mag. Fl. H&H with the .284 | 180gr | Sierra MatchKing 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.