Load Specifications
Load data in caliber 7 mm Mag. Fl. H&H with .284 | 175gr | Sierra MatchKing bullet and 48 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% | 40,712 psi | 85% | 2408 fps | 97.8% |
| Accurate 4350 | <<locked>> | 90% | 43,105 psi | 90% | 2461 fps | 99.4% |
| ADI AR 2208 | <<locked>> | 82% | 42,844 psi | 90% | 2375 fps | 99.5% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,743 psi | 89% | 2395 fps | 100% |
| Alliant Reloder-16 | <<locked>> | 90% | 42,250 psi | 88% | 2470 fps | 99.5% |
| Alliant Reloder-17 | <<locked>> | 86% | 42,119 psi | 88% | 2490 fps | 100% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 41,365 psi | 86% | 2484 fps | 100% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,593 psi | 76% | 2402 fps | 97.2% |
| Alliant Reloder-26 | <<locked>> | 98% | 43,105 psi | 90% | 2585 fps | 99.4% |
| Bofors RP3 | <<locked>> | 82% | 42,525 psi | 89% | 2402 fps | 100% |
| Bofors RP7 | <<locked>> | 86% | 43,033 psi | 90% | 2379 fps | 96.6% |
| Hodgdon H380 | <<locked>> | 82% | 43,149 psi | 90% | 2408 fps | 99% |
| Hodgdon H414 | <<locked>> | 88% | 42,946 psi | 90% | 2461 fps | 97.4% |
| Hodgdon Hybrid 100V | <<locked>> | 92% | 41,872 psi | 87% | 2415 fps | 99.9% |
| Hodgdon Superformance | <<locked>> | 88% | 42,395 psi | 89% | 2477 fps | 96.8% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,781 psi | 75% | 1539 fps | 100% |
| IMR 4350 | <<locked>> | 90% | 43,279 psi | 90% | 2408 fps | 96.8% |
| IMR 4451 Enduron | <<locked>> | 84% | 42,206 psi | 88% | 2365 fps | 96.9% |
| IMR 4831 | <<locked>> | 90% | 41,495 psi | 87% | 2418 fps | 99.2% |
| Lovex S065 | <<locked>> | 86% | 41,771 psi | 87% | 2362 fps | 98.2% |
| Lovex S070 | <<locked>> | 88% | 42,351 psi | 88% | 2395 fps | 97.3% |
| Lovex S071ᴾ | <<locked>> | 100% | 36,274 psi | 76% | 2329 fps | 96.6% |
| Norma MRP | <<locked>> | 98% | 43,250 psi | 90% | 2549 fps | 97.4% |
| Norma URP | <<locked>> | 90% | 43,033 psi | 90% | 2461 fps | 99.3% |
| Ramshot Hunter | <<locked>> | 90% | 41,771 psi | 87% | 2451 fps | 97.9% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,318 psi | 76% | 1575 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 84% | 42,192 psi | 88% | 2493 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,931 psi | 90% | 2487 fps | 99.2% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 42,409 psi | 89% | 2500 fps | 98.9% |
| Rottweil R 903 | <<locked>> | 84% | 42,699 psi | 89% | 2402 fps | 100% |
| Rottweil R 905 | <<locked>> | 96% | 42,975 psi | 90% | 2467 fps | 95.8% |
| Rottweil R 907 | <<locked>> | 86% | 43,033 psi | 90% | 2379 fps | 96.6% |
| Shooters World Long Rifle | <<locked>> | 86% | 41,771 psi | 87% | 2362 fps | 98.2% |
| Shooters World SW4350 | <<locked>> | 88% | 42,351 psi | 88% | 2395 fps | 97.3% |
| SNPE Vectan SP 11 | <<locked>> | 82% | 40,857 psi | 85% | 2402 fps | 99.7% |
| SNPE Vectan Tubal 5000 | <<locked>> | 82% | 42,264 psi | 88% | 2280 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 86% | 41,278 psi | 86% | 2316 fps | 96.8% |
| Somchem S355 | <<locked>> | 82% | 40,524 psi | 85% | 2352 fps | 99.8% |
| Somchem S365 | <<locked>> | 92% | 41,075 psi | 86% | 2461 fps | 100% |
| Somchem S385 | <<locked>> | 94% | 40,944 psi | 86% | 2405 fps | 96.2% |
| Vihtavuori N150 | <<locked>> | 84% | 41,350 psi | 86% | 2339 fps | 100% |
| Vihtavuori N160 | <<locked>> | 88% | 42,090 psi | 88% | 2408 fps | 99.1% |
| Vihtavuori N165ᴾ | <<locked>> | 100% | 42,772 psi | 89% | 2425 fps | 96.1% |
| Vihtavuori N550 | <<locked>> | 88% | 41,394 psi | 86% | 2411 fps | 98.9% |
| Vihtavuori N555 | <<locked>> | 98% | 42,946 psi | 90% | 2507 fps | 99.7% |
| Winchester 6.5 StaBALL | <<locked>> | 88% | 41,553 psi | 87% | 2382 fps | 100% |
| Winchester 760 | <<locked>> | 88% | 42,946 psi | 90% | 2461 fps | 97.4% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 37,173 psi | 78% | 2516 fps | 100% |
Start Load - Barrel Length: 26"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 92% | 33,315 psi | 70% | 2267 fps | 95.6% |
| Accurate 4350 | <<locked>> | 80% | 30,618 psi | 64% | 2215 fps | 96.5% |
| ADI AR 2208 | <<locked>> | 80% | 40,059 psi | 84% | 2326 fps | 99.2% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,929 psi | 83% | 2346 fps | 99.9% |
| Alliant Reloder-16 | <<locked>> | 80% | 31,154 psi | 65% | 2231 fps | 96.8% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,577 psi | 72% | 2339 fps | 99.2% |
| Alliant Reloder-23 | <<locked>> | 84% | 25,498 psi | 53% | 2106 fps | 95.7% |
| Alliant Reloder-25 | <<locked>> | 96% | 32,343 psi | 68% | 2300 fps | 95.3% |
| Alliant Reloder-26 | <<locked>> | 88% | 30,647 psi | 64% | 2306 fps | 95.8% |
| Bofors RP3 | <<locked>> | 80% | 39,900 psi | 83% | 2359 fps | 99.9% |
| Bofors RP7 | <<locked>> | 82% | 38,145 psi | 80% | 2287 fps | 95.3% |
| Hodgdon H380 | <<locked>> | 80% | 40,596 psi | 85% | 2362 fps | 98.6% |
| Hodgdon H414 | <<locked>> | 82% | 35,230 psi | 74% | 2310 fps | 95.1% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,529 psi | 60% | 2136 fps | 97.4% |
| Hodgdon Superformance | <<locked>> | 86% | 39,624 psi | 83% | 2425 fps | 95.9% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,861 psi | 56% | 1375 fps | 100% |
| IMR 4350 | <<locked>> | 86% | 38,130 psi | 80% | 2310 fps | 95.3% |
| IMR 4451 Enduron | <<locked>> | 80% | 37,217 psi | 78% | 2267 fps | 95.5% |
| IMR 4831 | <<locked>> | 80% | 29,878 psi | 62% | 2178 fps | 96.3% |
| Lovex S065 | <<locked>> | 80% | 34,650 psi | 72% | 2224 fps | 96.3% |
| Lovex S070 | <<locked>> | 82% | 35,128 psi | 73% | 2254 fps | 95.2% |
| Lovex S071 | <<locked>> | 96% | 31,879 psi | 67% | 2234 fps | 95% |
| Norma MRP | <<locked>> | 94% | 37,797 psi | 79% | 2441 fps | 95.7% |
| Norma URP | <<locked>> | 80% | 31,024 psi | 65% | 2215 fps | 96.5% |
| Ramshot Hunter | <<locked>> | 84% | 34,476 psi | 72% | 2300 fps | 95.8% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 57% | 1407 fps | 100% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,796 psi | 77% | 2392 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 80% | 30,342 psi | 63% | 2228 fps | 96% |
| ReloadSwiss RS 70 | <<locked>> | 80% | 30,458 psi | 64% | 2231 fps | 95% |
| Rottweil R 903 | <<locked>> | 80% | 37,376 psi | 78% | 2306 fps | 99.6% |
| Rottweil R 905 | <<locked>> | 94% | 40,364 psi | 84% | 2421 fps | 95.1% |
| Rottweil R 907 | <<locked>> | 82% | 38,145 psi | 80% | 2287 fps | 95.3% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,650 psi | 72% | 2224 fps | 96.3% |
| Shooters World SW4350 | <<locked>> | 82% | 35,128 psi | 73% | 2254 fps | 95.2% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 38,464 psi | 80% | 2356 fps | 99.4% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,711 psi | 83% | 2238 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 82% | 36,216 psi | 76% | 2221 fps | 95.4% |
| Somchem S355 | <<locked>> | 80% | 38,130 psi | 80% | 2310 fps | 99.6% |
| Somchem S365 | <<locked>> | 80% | 27,818 psi | 58% | 2175 fps | 98.5% |
| Somchem S385 | <<locked>> | 92% | 38,189 psi | 80% | 2352 fps | 95.3% |
| Vihtavuori N150 | <<locked>> | 80% | 36,230 psi | 76% | 2247 fps | 99.9% |
| Vihtavuori N160 | <<locked>> | 80% | 32,329 psi | 68% | 2215 fps | 96.8% |
| Vihtavuori N165 | <<locked>> | 98% | 40,219 psi | 84% | 2379 fps | 95.4% |
| Vihtavuori N550 | <<locked>> | 80% | 31,981 psi | 67% | 2221 fps | 96.5% |
| Vihtavuori N555 | <<locked>> | 84% | 27,354 psi | 57% | 2175 fps | 95.9% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 32,039 psi | 67% | 2195 fps | 98.7% |
| Winchester 760 | <<locked>> | 82% | 35,230 psi | 74% | 2310 fps | 95.1% |
| Winchester StaBALL HD | <<locked>> | 88% | 25,280 psi | 53% | 2175 fps | 96.2% |
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 | 175gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,585 fps; across all powders the maximum-charge window runs from 1,539 fps to 2,585 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 175.0 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. Always begin at the start load and work up in small increments while checking case and primer for pressure signs.