Load Specifications
Load data in caliber 7 x 57 R with .284 | 175gr | Sierra MatchKing bullet and 51 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.
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Max Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100ᴾ | <<locked>> | 100% | 42,757 psi | 87% | 2388 fps | 97.6% |
| Accurate 4064 | <<locked>> | 82% | 43,758 psi | 89% | 2336 fps | 100% |
| Accurate 4350 | <<locked>> | 90% | 42,525 psi | 86% | 2395 fps | 98.9% |
| ADI AR 2208 | <<locked>> | 82% | 42,221 psi | 86% | 2310 fps | 99.1% |
| Alliant Reloder- TS 15.5 | <<locked>> | 82% | 42,090 psi | 85% | 2333 fps | 99.8% |
| Alliant Reloder-16 | <<locked>> | 92% | 44,367 psi | 90% | 2451 fps | 99.4% |
| Alliant Reloder-17 | <<locked>> | 86% | 41,655 psi | 84% | 2425 fps | 99.8% |
| Alliant Reloder-23ᴾ | <<locked>> | 100% | 40,741 psi | 83% | 2415 fps | 99.7% |
| Alliant Reloder-25ᴾ | <<locked>> | 100% | 36,071 psi | 73% | 2326 fps | 96% |
| Alliant Reloder-26 | <<locked>> | 98% | 42,511 psi | 86% | 2510 fps | 98.8% |
| Bofors RP3 | <<locked>> | 82% | 41,858 psi | 85% | 2336 fps | 99.9% |
| Bofors RP7 | <<locked>> | 86% | 42,525 psi | 86% | 2313 fps | 95.8% |
| Hodgdon H380 | <<locked>> | 82% | 42,540 psi | 86% | 2343 fps | 98.5% |
| Hodgdon H414 | <<locked>> | 88% | 42,119 psi | 85% | 2388 fps | 96.5% |
| Hodgdon Hybrid 100V | <<locked>> | 94% | 43,787 psi | 89% | 2392 fps | 99.9% |
| Hodgdon TrailBossᴾ | <<locked>> | 100% | 35,650 psi | 72% | 1506 fps | 100% |
| IMR 4064 | <<locked>> | 82% | 44,382 psi | 90% | 2339 fps | 99.5% |
| IMR 4350 | <<locked>> | 90% | 42,801 psi | 87% | 2343 fps | 95.9% |
| IMR 4451 Enduron | <<locked>> | 86% | 44,237 psi | 90% | 2346 fps | 96.7% |
| IMR 4831 | <<locked>> | 92% | 43,642 psi | 89% | 2398 fps | 99.1% |
| Lovex S062 | <<locked>> | 82% | 44,411 psi | 90% | 2339 fps | 100% |
| Lovex S065 | <<locked>> | 88% | 43,787 psi | 89% | 2343 fps | 98% |
| Lovex S070 | <<locked>> | 90% | 44,483 psi | 90% | 2375 fps | 97.2% |
| Norma 203B | <<locked>> | 82% | 44,396 psi | 90% | 2379 fps | 99.7% |
| Norma MRP | <<locked>> | 98% | 42,714 psi | 87% | 2474 fps | 96.4% |
| Norma URP | <<locked>> | 90% | 42,496 psi | 86% | 2392 fps | 98.8% |
| Ramshot Big Game | <<locked>> | 82% | 44,251 psi | 90% | 2398 fps | 99.7% |
| Ramshot Hunter | <<locked>> | 92% | 43,976 psi | 89% | 2431 fps | 97.8% |
| ReloadSwiss RS 14ᴾ | <<locked>> | 100% | 36,187 psi | 73% | 1542 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 82% | 42,888 psi | 87% | 2329 fps | 97.2% |
| ReloadSwiss RS 60 | <<locked>> | 86% | 44,353 psi | 90% | 2474 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 90% | 42,148 psi | 85% | 2415 fps | 98.7% |
| ReloadSwiss RS 70 | <<locked>> | 90% | 41,800 psi | 85% | 2428 fps | 98.2% |
| Rottweil R 903 | <<locked>> | 84% | 42,032 psi | 85% | 2336 fps | 99.8% |
| Rottweil R 907 | <<locked>> | 86% | 42,525 psi | 86% | 2313 fps | 95.8% |
| Shooters World Long Rifle | <<locked>> | 88% | 43,787 psi | 89% | 2343 fps | 98% |
| Shooters World Precision | <<locked>> | 82% | 44,411 psi | 90% | 2339 fps | 100% |
| Shooters World SW4350 | <<locked>> | 90% | 44,483 psi | 90% | 2375 fps | 97.2% |
| SNPE Vectan SP 11 | <<locked>> | 84% | 43,178 psi | 88% | 2385 fps | 99.6% |
| SNPE Vectan Tubal 5000 | <<locked>> | 84% | 44,295 psi | 90% | 2264 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 88% | 43,410 psi | 88% | 2297 fps | 96.7% |
| Somchem S355 | <<locked>> | 84% | 42,714 psi | 87% | 2339 fps | 99.8% |
| Somchem S365 | <<locked>> | 94% | 43,207 psi | 88% | 2441 fps | 100% |
| Somchem S385 | <<locked>> | 96% | 43,134 psi | 87% | 2385 fps | 96% |
| Vihtavuori N150 | <<locked>> | 86% | 43,381 psi | 88% | 2320 fps | 100% |
| Vihtavuori N160 | <<locked>> | 90% | 44,251 psi | 90% | 2388 fps | 99% |
| Vihtavuori N550 | <<locked>> | 90% | 43,468 psi | 88% | 2392 fps | 98.8% |
| Vihtavuori N555 | <<locked>> | 98% | 42,105 psi | 85% | 2434 fps | 99.3% |
| Winchester 6.5 StaBALL | <<locked>> | 90% | 44,048 psi | 89% | 2369 fps | 99.9% |
| Winchester 760 | <<locked>> | 88% | 42,467 psi | 86% | 2395 fps | 96.6% |
| Winchester StaBALL HDᴾ | <<locked>> | 100% | 36,448 psi | 74% | 2434 fps | 99.8% |
Recommended = one of the top powders for this cartridge and bullet combination.
Start Load - Barrel Length: 23.62"
| Powder | Charge | FR | MaxP | % | V(0) | z |
|---|---|---|---|---|---|---|
| Accurate 3100 | <<locked>> | 94% | 35,085 psi | 71% | 2247 fps | 95.4% |
| Accurate 4064 | <<locked>> | 80% | 41,089 psi | 83% | 2293 fps | 100% |
| Accurate 4350 | <<locked>> | 80% | 30,240 psi | 61% | 2149 fps | 95.5% |
| ADI AR 2208 | <<locked>> | 80% | 39,668 psi | 80% | 2264 fps | 98.7% |
| Alliant Reloder- TS 15.5 | <<locked>> | 80% | 39,523 psi | 80% | 2287 fps | 99.6% |
| Alliant Reloder-16 | <<locked>> | 80% | 30,661 psi | 62% | 2159 fps | 95.6% |
| Alliant Reloder-17 | <<locked>> | 80% | 34,098 psi | 69% | 2270 fps | 98.6% |
| Alliant Reloder-23 | <<locked>> | 86% | 26,672 psi | 54% | 2087 fps | 95.3% |
| Alliant Reloder-25 | <<locked>> | 98% | 34,011 psi | 69% | 2277 fps | 95% |
| Alliant Reloder-26 | 44.6 gr | 90% | 32,242 psi | 65% | 2283 fps | 95.4% |
| Bofors RP3 | <<locked>> | 80% | 39,247 psi | 80% | 2293 fps | 99.7% |
| Bofors RP7 | <<locked>> | 84% | 39,987 psi | 81% | 2267 fps | 95% |
| Hodgdon H380 | <<locked>> | 80% | 39,987 psi | 81% | 2297 fps | 98% |
| Hodgdon H414 | <<locked>> | 86% | 39,595 psi | 80% | 2343 fps | 95.7% |
| Hodgdon Hybrid 100V | <<locked>> | 80% | 28,195 psi | 57% | 2073 fps | 96.5% |
| Hodgdon TrailBoss | <<locked>> | 80% | 26,585 psi | 54% | 1345 fps | 100% |
| IMR 4064 | <<locked>> | 80% | 41,684 psi | 85% | 2293 fps | 99.2% |
| IMR 4350 | <<locked>> | 88% | 40,263 psi | 82% | 2297 fps | 95.1% |
| IMR 4451 Enduron | <<locked>> | 82% | 39,218 psi | 80% | 2254 fps | 95.3% |
| IMR 4831 | <<locked>> | 80% | 29,559 psi | 60% | 2116 fps | 95.2% |
| Lovex S062 | <<locked>> | 80% | 41,713 psi | 85% | 2297 fps | 99.9% |
| Lovex S065 | <<locked>> | 80% | 34,301 psi | 70% | 2162 fps | 95.4% |
| Lovex S070 | <<locked>> | 84% | 36,767 psi | 75% | 2231 fps | 95% |
| Norma 203B | <<locked>> | 80% | 41,727 psi | 85% | 2333 fps | 99.5% |
| Norma MRP | <<locked>> | 96% | 39,871 psi | 81% | 2418 fps | 95.5% |
| Norma URP | <<locked>> | 80% | 30,690 psi | 62% | 2152 fps | 95.5% |
| Ramshot Big Game | <<locked>> | 80% | 41,307 psi | 84% | 2346 fps | 99.4% |
| Ramshot Hunter | <<locked>> | 86% | 36,390 psi | 74% | 2287 fps | 95.6% |
| ReloadSwiss RS 14 | <<locked>> | 80% | 27,137 psi | 55% | 1381 fps | 100% |
| ReloadSwiss RS 50 | <<locked>> | 80% | 40,335 psi | 82% | 2283 fps | 96.5% |
| ReloadSwiss RS 60 | <<locked>> | 80% | 36,274 psi | 74% | 2326 fps | 100% |
| ReloadSwiss RS 62 | <<locked>> | 82% | 32,010 psi | 65% | 2211 fps | 95.8% |
| ReloadSwiss RS 70 | 41.3 gr | 84% | 34,345 psi | 70% | 2267 fps | 95.8% |
| Rottweil R 903 | <<locked>> | 80% | 36,999 psi | 75% | 2244 fps | 99.2% |
| Rottweil R 907 | <<locked>> | 84% | 39,987 psi | 81% | 2267 fps | 95% |
| Shooters World Long Rifle | <<locked>> | 80% | 34,301 psi | 70% | 2162 fps | 95.4% |
| Shooters World Precision | <<locked>> | 80% | 41,713 psi | 85% | 2297 fps | 99.9% |
| Shooters World SW4350 | <<locked>> | 84% | 36,767 psi | 75% | 2231 fps | 95% |
| SNPE Vectan SP 11 | <<locked>> | 80% | 37,855 psi | 77% | 2290 fps | 98.9% |
| SNPE Vectan Tubal 5000 | <<locked>> | 80% | 39,276 psi | 80% | 2185 fps | 100% |
| SNPE Vectan Tubal 7000 | <<locked>> | 84% | 38,014 psi | 77% | 2201 fps | 95.1% |
| Somchem S355 | <<locked>> | 80% | 37,739 psi | 77% | 2247 fps | 99.2% |
| Somchem S365 | 36.7 gr | 80% | 27,514 psi | 56% | 2110 fps | 97.7% |
| Somchem S385 | <<locked>> | 94% | 40,234 psi | 82% | 2333 fps | 95.1% |
| Vihtavuori N150 | <<locked>> | 80% | 35,882 psi | 73% | 2192 fps | 99.6% |
| Vihtavuori N160 | <<locked>> | 80% | 31,966 psi | 65% | 2152 fps | 95.9% |
| Vihtavuori N550 | <<locked>> | 80% | 31,473 psi | 64% | 2152 fps | 95.5% |
| Vihtavuori N555 | <<locked>> | 86% | 28,601 psi | 58% | 2152 fps | 95.5% |
| Winchester 6.5 StaBALL | <<locked>> | 80% | 31,647 psi | 64% | 2133 fps | 97.9% |
| Winchester 760 | <<locked>> | 86% | 39,595 psi | 80% | 2343 fps | 95.7% |
| Winchester StaBALL HD | <<locked>> | 90% | 26,672 psi | 54% | 2156 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 51 powders for 7 x 57 R loaded with the .284 | 175gr | Sierra MatchKing. Alliant Reloder-26 delivers the highest muzzle velocity at 2,510 fps; across all powders the maximum-charge window runs from 1,506 fps to 2,510 fps. Accurate 3100 gives the best case fill at 100 %, and 51 of the 51 powders fall inside the usable 80–100 % fill window.
Relative to the caliber's maximum pressure (340 MPa), the top charges use 72–90 %, 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. Accurate 3100, Alliant Reloder-23, Alliant Reloder-25 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 x 57 R with the .284 | 175gr | 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.